May 2003 - Boost-users - lists.boost.org

Intel compiler, Boost and STLPort (3rd try)
by Andre du Toit 21 May '03

21 May '03

Ahem, could someone please answer my simple question: Is is possible to compile programs which use Boost and STLPort (instead of Microsoft Foundation Classes) with the Intel compiler, on Windows? I am getting all kinds of weird errors which relate to streaming operators, which makes me think that my usage of STLPort might be involved? On the other hand, if I use MSCV6 instead of Intel compiler (7.0) I do not get the same errors. It seems that some of our in-house software can't be compiled with MSVC6 because of problems this specific compiler has with templates. The same code compiles without problem on the latest GCC compilers. My latest source of joy is the following (about which I am totally clueless) : C:\PROGRAM FILES\BOOST_1_30_0\boost/lexical_cast.hpp(147): error: no operator "<<" matches these operands operand types are: std::basic_stringstream<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t>> << const std::basic_string<char, std::char_traits<char>, std::allocator<char>> return stream << input; ^ detected during: instantiation of "bool={bool} boost::detail::lexical_stream<Target, Source>::operator<<(const Source &) [with Target=unsigned short, Source=std::basic_string<char, std::char_traits<char>, std::allocator<char>>]" at line 192 instantiation of "Target boost::lexical_cast<Target,Source>(Source) [with Target=unsigned short, Source=std::basic_string<char, std::char_traits<char>, std::allocator<char>>]" at line 30 of "C:\PROGRAM FILES\BOOST_1_30_0\boost/date_time/ time_parsing.hpp" instantiation of "time_duration boost::date_time::parse_delimited_time_duration<time_duration>(const std::string &) [with time_duration=boost::posix_time::time_duration]" C:\PROGRAM FILES\BOOST_1_30_0\boost/lexical_cast.hpp(153): error: no operator ">>" matches these operands operand types are: std::basic_stringstream<char, std::char_traits<char>, std::allocator<char>> >> boost::int64_t stream >> output && ^ detected during: instantiation of "bool={bool} boost::detail::lexical_stream<Target, Source>::operator>>(InputStreamable &) [with Target=boost::int64_t={__int64}, Source=std::basic_string<char, std::char_traits<char>, std::allocator<char>>, InputStreamab le=boost::int64_t={__int64}]" at line 192 instantiation of "Target boost::lexical_cast<Target,Source>(Source) [with Target=boost::int64_t={__int64}, Source=std::basic_string<char, std::char_traits<char>, std::allocator<char>>]" at line 47 of "C:\PROGRAM FILES\BOOST_1_30_0\boost/ date_time/time_parsing.hpp" instantiation of "time_duration boost::date_time::parse_delimited_time_duration<time_duration>(const std::string &) [with time_duration=boost::posix_time::time_duration]" Greetings, Andre.

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RE: [Boost-Users] boost::date_time::posix_time and Intel Compiler 7.0?
by Tom Matelich 21 May '03

21 May '03

One other thing I should point out to you about building, or actually lack there of, inside MSVC. Intel doesn't know how to generate the PDB files themselves, so they call MSVC's cl to do it for them. This is a problem because if cl can't build the file, it doesn't generate any dependencies for it. If you use templates that MSVC can't handle, you'll probably want to switch to makefiles. We did. Fortunately, qmake rocks :) > -----Original Message----- > From: adutoit [mailto:adutoit@stonethree.com] > Sent: Wednesday, May 21, 2003 7:16 AM > To: Boost-Users(a)yahoogroups.com > Subject: Re: [Boost-Users] boost::date_time::posix_time and Intel > Compiler 7.0? > > > Right; here are my compiler options, build configuration and the rest. > > Basically I am building a static library, which depends on > some in-house > software components, Qt and Boost. > Our own library S3FC (), uses templates in such a manner as > to make MSVC6 > very unhappy. Therefore we use the Intel compiler under M$. > Needless to say, our software compiles problemfree with GCC. For the > aforementioned and other reasons we do not make use of > Microsoft Foundation Classes when compiling under Windoze, but use the > latest version of STLPort (which has been at the same version > level for some > time now). > > Anyway; our Windows development work takes place under Visual > C++ but with > the Intel compiler (version 7.0) selected instead of the > MSVC6 compiler. > > OK; with this background then, here is the basic Visual C++ > project settings > for my build of the above-mentioned library. I have removed > include paths > etc. which point to in-house > software: > > 1) "Not Using MFCC" selected for general project settings (as > explained > above). > 2) Warning level => 3 > Optimizations => Maximise Speed > Debug info => None > 3) Project Options => > /nologo /ML /W3 /GR /GX /O2 /D "NDEBUG" /D "DEP_MS_WIN" > /D "WIN32" /D > "_WINDOWS" > /U "QT_NO_STL" /Fp"Release/libs3_qt.pch" /YX /Fo"Release/" > /Fd"Release/" /FD > /c > > The include and library paths for STLPort is set somewhere > else, but these > are basically the options. > > If anyone knows of any special project options, preprocessor > directives I am > perhaps missing for building Boost-related projects with the > Intel compiler, > please let me know! > I suspect that we will soon be using Boost for other > functionality besides > that provided by date_time at the moment. Besides, I like > the library and > works in our main development environment, > Linux with the GCC compiler. > > OK, I am forgetting about this problem for a day or two... > Thanks to everyone who has provided me with help so far, > especially Jeff > Garland. > > Greetings, > Andre. > > ----- Original Message ----- > From: "Jeff Garland" <jeff(a)crystalclearsoftware.com> > To: <Boost-Users(a)yahoogroups.com> > Sent: Wednesday, May 21, 2003 3:42 PM > Subject: RE: [Boost-Users] boost::date_time::posix_time and > Intel Compiler > 7.0? > > > > > > > Anyway; it just irks me that I should have issues with > 'standard' stuff, > > > like streaming operators. > > > And the fact that the same code compiles with MSVC6 and > NOT the Intel > > > compiler. > > > > Ok. > > > > > Back on the #define which started my woes. The fact of > the matter is, I > get > > > everything compiled when using MSVC6 and not the Intel compiler! > > > I.e. the MSVC6-specific code works, the 'other' compiler > code for the > > > supposedly more Boost-compliant/friendly Intel compiler does not. > > > > I guess I was thinking that what was happening is that when > compiling > > with Intel you were getting the MSVC defined and hence were > taking the > > non-generic code. Perhaps not... > > > > Have you tried to run the tests in libs/date_time/test with your > > Intel/STLPort configuration? That might help diagnose the issue. > > Also, it might be instructive to post your compile command. Perhaps > > someone with experience on Intel can figure out why your > configuration > > differs from the one that apparently passes the tests. > > > > > Could it be because I am using STLPort in conjunction > with the Intel > > > compiler? > > > > Might be a factor. There have been some issues before with > the library > > configuration assuming MSVC limitations which don't apply > with STLPort > > in the mix. > > > > > Aargh. Just give me Linux and GCC... > > > > Agreed :-) > > > > Jeff > > > > > > > > Info: <http://www.boost.org> > > Wiki: > <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Get A Free Psychic Reading! > Your Online Answer To Life's Important Questions. > http://us.click.yahoo.com/aM1XQD/od7FAA/uetFAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > Info: <http://www.boost.org> > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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Release builds and C++Builder
by Russell Hind 21 May '03

21 May '03

Does doing a release build of the boost libraries define NDEBUG. (don't know if this is standard) but in C++Builder, NDEBUG disables asserts so it is useful to define it when doing release builds. Thanks Russell

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lambda library: How to access member variables?
by Chuck Messenger 21 May '03

21 May '03

I'm trying to figure out how to do something like this: for_each(c.begin(), c.end(), cout << _1.member << "\n"); which is obviously wrong, but hopefully you know what I mean... Experimenting with ways of accessing members inside a lambda, I wrote the following: #include <iostream> #include <boost/lambda/lambda.hpp> #include <vector> using namespace std; using namespace boost; using namespace lambda; struct XX { XX(int a, int b) { a_ = a; b_ = b; } int a_; int b_; }; int main() { XX xx(5, 6); XX *xxp = &xx; cout << "These should all be equivalent:\n"; cout << xxp ->* &XX::a_ << endl; cout << (_1 ->* &XX::a_)(xxp) << endl; //cout << (_1 ->* &XX::a_)(&xx) << endl; // Doesn't compile! cout << (&_1 ->* &XX::a_)(xx) << endl; cout << "Now, let's try with the vector:\n"; vector<XX> xxVec; xxVec.push_back(XX(3, 4)); cout << (&_1 ->* &XX::a_)(xxVec[0]) << endl; //cout << (_1 ->* &XX::a_)(&xxVec[0]) << endl; // Doesn't compile! cout << (_1 ->* &XX::a_)(xxp = &xxVec[0]) << endl; // Now it compiles... //cout << (_1 ->* &XX::a_)(xxVec.begin()) << endl; // Doesn't compile! //cout << (_1 ->* &XX::a_)(&*xxVec.begin()) << endl; // Still not... cout << (_1 ->* &XX::a_)(xxp = &*xxVec.begin()) << endl; // Now it compiles... exit(0); } I'm mystified by why some of these lines don't compile (gcc 3.2.2). Can anyone explain it? The compiler generates some horrific error messages -- I haven't tried to pick through them yet... - Chuck

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MPL and apply_if trouble
by Tarjei Knapstad 20 May '03

20 May '03

I encountered the following problem today which I've reduced down to a simple example. Basically what I want to do is recurse through a typelist (mpl::vector) popping an element each time and end recursion by using apply_if with mpl::empty<List> as the condition. I've made a simple Reverse class template to illustrate the problem. (The Reverse class is of course intended to reverse the contents of a typelist....) --------------------- begin code --------------------- #include <boost/mpl/front.hpp> #include <boost/mpl/push_back.hpp> #include <boost/mpl/pop_front.hpp> #include <boost/mpl/apply_if.hpp> #include <boost/mpl/empty.hpp> #include <boost/mpl/size.hpp> #include <boost/mpl/vector.hpp> using namespace boost::mpl; template <typename List> struct Reverse { typedef typename front<List>::type FrontElem; typedef typename pop_front<List>::type Rest; typedef typename apply_if< empty<Rest>, vector<FrontElem>, typename push_back<typename Reverse<Rest>::Type, FrontElem>::type >::type Type; }; typedef vector<int,int,long> List; typedef Reverse<List>::Type RevList; --------------------- end code ----------------------- When attempting to create the RevList type however, gcc spits the following at me: reverse.cpp: In instantiation of `boost::mpl::pop_front<boost::mpl::vector0<boost::mpl::void_> >': reverse.cpp:15: instantiated from `Reverse<boost::mpl::vector0<boost::mpl::void_> >' reverse.cpp:21: instantiated from `Reverse<boost::mpl::vector1<long int> >' reverse.cpp:21: instantiated from `Reverse<boost::mpl::vector2<int, long int> >' reverse.cpp:21: instantiated from `Reverse<List>' reverse.cpp:25: instantiated from here reverse.cpp:15: base class ` boost::mpl::pop_front_traits<boost::mpl::aux::vector_tag<0> >::algorithm<boost::mpl::vector0<boost::mpl::void_> >' has incomplete type reverse.cpp: In instantiation of `Reverse<boost::mpl::vector0<boost::mpl::void_> >': reverse.cpp:21: instantiated from `Reverse<boost::mpl::vector1<long int> >' reverse.cpp:21: instantiated from `Reverse<boost::mpl::vector2<int, long int> >' reverse.cpp:21: instantiated from `Reverse<List>' reverse.cpp:25: instantiated from here reverse.cpp:15: no type named `type' in `struct boost::mpl::pop_front<boost::mpl::vector0<boost::mpl::void_> >' reverse.cpp:21: no type named `type' in `struct boost::mpl::pop_front<boost::mpl::vector0<boost::mpl::void_> >' reverse.cpp: In instantiation of `Reverse<boost::mpl::vector1<long int> >': reverse.cpp:21: instantiated from `Reverse<boost::mpl::vector2<int, long int> >' reverse.cpp:21: instantiated from `Reverse<List>' reverse.cpp:25: instantiated from here reverse.cpp:21: no type named `Type' in `struct Reverse<boost::mpl::vector0<boost::mpl::void_> >' reverse.cpp: In instantiation of `Reverse<boost::mpl::vector2<int, long int> >': reverse.cpp:21: instantiated from `Reverse<List>' reverse.cpp:25: instantiated from here reverse.cpp:21: no type named `Type' in `struct Reverse<boost::mpl::vector1<long int> >' reverse.cpp: In instantiation of `Reverse<List>': reverse.cpp:25: instantiated from here reverse.cpp:21: no type named `Type' in `struct Reverse<boost::mpl::vector2<int, long int> >' reverse.cpp:25: syntax error before `;' token I cannot see why it reaches the point where it tries to instantiate Reverse with an empty typelist - the apply_if should stop that (at least that's my intention. Am I being a complete ass somewhere in this code snippet? I've become blinded by now, so if anyone can point out what's wrong I would greatly appreciate it. Sincerely, -- Tarjei

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BOOST_DEDUCED_TYPENAME error
by Pete Cilliers 20 May '03

20 May '03

I get the following error when trying to use the filesystem library on MSVC 6.0 : error C2061: syntax error : identifier 'BOOST_DEDUCED_TYPENAME' The line causing the problem is in the \detail\iterator.hpp file: template <class T> type_traits::yes_type is_mutable_iterator_helper(T const*, BOOST_DEDUCED_TYPENAME T::value_type*); I have run a config Test and both BOOST_DEDUCED_TYPENAME and BOOST_NO_DEDUCED_TYPENAME are defined but have no value. Since MSVC 6.0 supports the 'typename' keyword I would think that the declaration above in the iterator.hpp file should use 'typename' rather than BOOST_DEDUCED_TYPENAME. Anyone else experience this problem? ******************************************************************************************* <http://www.intec-telecom-systems.com/> This e-mail and any attachments are confidential and may also be privileged and/or copyright material of Independent Technology Systems Limited (or its affiliated companies). If you are not the intended or authorised recipient of this email or have received it in error, please delete it immediately and notify the sender by e-mail. In such a case reading, reproducing, printing or further dissemination of this e-mail is strictly prohibited and may be unlawful. Independent Technology Systems Limited does not represent or warrant that an attachment hereto is free from computer viruses or other defects. The opinions expressed in this e-mail and any of the attachments may be those of the author and are not necessarily those of Independent Technology Systems Limited. ******************************************************************************************

2 1

dollar sign doesn't work in regular and format expressions
by Douglas Roberts 20 May '03

20 May '03

I am compiling a program that uses the boost RegEx library on an AS/400 native C compiler. When compiled with VC6 it runs fine, but when compiled with the AS/400 compiler, the dollar sign doesn't function in either the regular and format expressions. For example, when I try a regex_merge and I have a format expression something like this "Example $1 and $2", it will find the submatches, but not insert anything in for $1 and $2, it'll just be "Example and ". Also, in a regular expression when the dollar sign serves as a line anchor, it won't match when it should. Both usages of the dollar sign run fine when compiled on the PC. Everything else, so far, seems to be working okay on the AS/400. Anyone have any ideas? Thanks, Doug

2 1

Newbie: Problem with Signals
by Ray 20 May '03

20 May '03

I am having some problems with boost::signals version 1_30_0 on XP, compiled and linked using VC6. I am building a timer mechanism, similar to that with Qt. A user instanciates a timer with some millisecond value, starts the timer via t.Start(), and then enters the event loop (or in most cases, returns from a function call by the event loop). Timer definition: class Timer { typedef boost::signal1<void, int> TimerSignalType; typedef TimerSignalType::slot_type TimerSlotType; public: boost::signals::connection TimerConnect(const TimerSlotType& slot ) { return OnRing.connect( slot ); } Timer(); Timer( const Timer& ); Timer( unsigned long millesecInterval, TimerType t = Continous ); ~Timer(); void Start(); void Ring() {OnRing( myId );} private: TimerSignalType OnRing; int myId; }; void Rang( int i ) { cout << "Received timer " << endl; } main() { EventLoop *eventLoop = EventLoop::Instance(); Timer t1( 3000, Continous ); t1.TimerConnect( boost::bind( Rang, _1) ); t1.Start(); eventLoop->Exec(); } eventLoop->Exec() start an event loop. The code always crashes when atteping to execute the connected function. What am I doing wrong? Ray

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RE: [Boost-Users] newbie regex problem
by Ferdinand Prantl 20 May '03

20 May '03

Hi Mark, boost::regex_match requires the regex to match the _whole_ string, use another regex - "^Now.*$" - or another method - boost::regex_search. See the documentation: http://www.boost.org/libs/regex/template_class_ref.htm#query_match http://www.boost.org/libs/regex/template_class_ref.htm#reg_search Ferda -----Original Message----- From: Mark Sizer [mailto:yg-boost-users@gmane.org] Sent: Tuesday, May 20, 2003 01:25 To: boost-users(a)yahoogroups.com Subject: [Boost-Users] newbie regex problem Everything builds and runs fine, I'm just not getting the result I expect. std::string sString = "Now is the time for all good men..."; std::string sRegEx1 = "^Now"; boost::regex regex1( sRegEx1 ); CPPUNIT_ASSERT( boost::regex_match(sString, regex1) ); is failing. I have to assume I'm doing something really stupid. Could someone tell me what? Thanks, - Mark ------------------------ Yahoo! Groups Sponsor ---------------------~--> Get A Free Psychic Reading! Your Online Answer To Life's Important Questions. http://us.click.yahoo.com/Lj3uPC/Me7FAA/uetFAA/EbFolB/TM ---------------------------------------------------------------------~-> Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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Borland 5 and indirect_iterator
by Stephen Love 19 May '03

19 May '03

Hi all, Using Borland C++Builder5 (which has bcc32 5.5.1) I've attempted the tests for indirect_iterator which compile fine. However, the following fails: list< shared_ptr< int > > ctr; void foo( int x ) { } for_each( make_indirect_iterator( ctr.begin() ), make_indirect_iterator( ctr.end() ), foo ); with the first error being: [C++ Error] iterator.h(125): E2404 Dependent type qualifier 'shared_ptr<int>' has no member type named 'difference_type' which then causes a failure to instantiate the iterator_traits. I'm no template guru, so I can make the full error list available if required. Anyone know what's going on? Thanks Steve -- Steve Love: steve.love(a)essennell.co.uk ACCU - accu.org Promoting Professionalism in Programming

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MPL pop_back problem
by Tarjei Knapstad 19 May '03

19 May '03

I get some weird error messages which I don't really understand when I tried using mpl::pop_back today. The following example (more or less an exact copy of the one in the documentation): ------------------ start code ----------------- #include <boost/mpl/list.hpp> #include <boost/mpl/pop_back.hpp> using namespace boost::mpl; void f() { typedef list<int, double>::type ListType; typedef pop_back<ListType>::type PoppedList; } ------------------ end code ---------------------- fails on gcc 3.2 (Boost 1.30) with: pop_back.cpp: In instantiation of `boost::mpl::pop_back<f()::ListType>': pop_back.cpp:9: instantiated from here pop_back.cpp:9: base class ` boost::mpl::pop_back_traits<boost::mpl::aux::list_tag>::algorithm<f()::ListType> ' has incomplete type pop_back.cpp: In function `void f()': pop_back.cpp:9: ISO C++ forbids declaration of `type' with no type pop_back.cpp:9: typedef name may not be class-qualified pop_back.cpp:9: parse error before `;' token I'd appreciate if someone could clear this up for me. Regards, -- Tarjei

2 4

[thread] confusion about recursive_try_mutex
by Christopher Currie 19 May '03

19 May '03

I've been looking at the implementation of recursive_try_mutex, and something struck me as odd in the pthreads implementation: bool recursive_try_mutex::do_trylock() { # if defined(BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE) int res = 0; res = pthread_mutex_trylock(&m_mutex); assert(res == 0); if (res == 0) { if (++m_count > 1) { res = pthread_mutex_unlock(&m_mutex); assert(res == 0); } return true; } return false; # else // ... } It appears that if BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE is defined, in debug mode this function will never return false, because the assert will fire first instead. Am I reading this incorrectly, or is there something happening somewhere else that I'm missing? Thanks in advance, Christopher Currie [Non-text portions of this message have been removed]

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initial function of boost::thread
by Mark Sizer 19 May '03

19 May '03

This is also stuff that has been answered before. I really have searched. Links to the answers will be as appreciate as an inline responses. I've been using free file-scoped functions up to now because I really don't understand what a boost::function0<void>& is. I get, I think, that it can't be a member function, because there is no 'this' attached. However, I'm having trouble with two things: #1 from: function.tutorial.html <quote> boost::function2<float, int, int> f; struct int_div { float operator()(int x, int y) const { return ((float)x)/y; }; }; f = int_div(); </quote> operator() _is_ a member function. When assigning int_div() to f, which of potentially zillions of instances of int_div is being referenced? Is a new one created on invocation? (the example uses std::cout << f(5,2) << endl;) I'm missing a theoretical bit of information that makes this hang together. Help, please. #2 from: http://www.cuj.com/articles/2002/0205/0205a/0205a.htm?topic=articles <quote> However, because Boost.Threads uses a function object instead of just a function pointer, it is possible for the function object to carry data needed by the thread. This approach is actually more flexible and is type safe. When combined with functional libraries, such as Boost.Bind, this design actually allows you to easily pass any amount of data to the newly created thread. </quote> BUT HOW?!?! Any pointers (with many examples, please) would be much appreciated. Thanks, - Mark

2 2

BGL sample code error -- edge_property.cpp
by Chuck Messenger 18 May '03

18 May '03

edge_proprety.cpp, as included in Boost release 1.30.0, generates warnings under gcc 3.2.2, since it is missing a couple of typenames. Here's the needed patch: 95c95 < property_map<Graph, edge_mycapacity_t>::const_type --- > typename property_map<Graph, edge_mycapacity_t>::const_type 97c97 < property_map<Graph, edge_myflow_t>::const_type --- > typename property_map<Graph, edge_myflow_t>::const_type - Chuck Messenger

2 1

Using time_duration::rep_type::ticks_per_second
by d_zakaib 18 May '03

18 May '03

I have written a function to convert a posix_time::ptime to a windows FILETIME (which is in essence a 64-bit value counting 100-nanosecond intervals since Jan 01, 1601). In order to do so, I do a time difference between the ptime and a time setup to the FILETIME reference time. To convert from this time_duration to the FILETIME count, I use time_duration::rep_type::ticks_per_second. Since this does not seem to be documented I just wanted to make sure I was using it correctly (or if I should be using it at all). Here is my code (which seems to work): const ULONGLONG nanosecPerFileTimeUnit = 100; using namespace boost::posix_time; using namespace boost::gregorian; FILETIME toFileTime ( const ptime& time ) { ptime refTime(date(1601,Jan,01)); time_duration sinceRefDate = time - refTime; ULARGE_INTEGER durationInFileTimeUnits; const ULONGLONG timeDurTicksPerSec = time_duration::rep_type::ticks_per_second; const ULONGLONG fileTimeUnitsPerTimeDurTick = (nanosecPerSec/timeDurTicksPerSec) / nanosecPerFileTimeUnit; durationInFileTimeUnits.QuadPart = sinceRefDate.ticks()*fileTimeUnitsPerTimeDurTick ; FILETIME ft; ft.dwLowDateTime = durationInFileTimeUnits.LowPart; ft.dwHighDateTime = durationInFileTimeUnits.HighPart; return ft; }

2 1

regex build problem
by Benedikt Weber 18 May '03

18 May '03

Hi everybody I tried to build boost out of the box. Everthing worked fine except the following: ------------------------------------- D:\boost\boost_1_30_0>bjam "-sTOOLS=cwpro8" ... FileClone libs\regex\build\bin-stage\boost_regex_debug.lib The system cannot find the file specified. ... FileClone libs\regex\build\bin-stage\boost_regex.lib The system cannot find the file specified. -------------------------------------- The actual file names generated in libs\regex\build\bin-stage are: libboost_regex_debug.lib and libboost_regex.lib, i.e. they have an extra "lib" prepended. Interestingly enough the analogous dll files are: boost_regex_debug.dll and boost_regex.dll as expected. Any ideas? Benedikt

2 1

more ublas test problems
by Benedikt Weber 18 May '03

18 May '03

When compling the bench* tests for ublas using the jamfiles, both cwpro8 and borland do not seem to know about the function rand(). I think that <stdlib.h> should be included somewhere. MSVC seems to do this implicitely. Furthermore, only debug versions are generated for all tests (test* and bench*). Benedikt

3 7

strange behaviour at setup on windows2000
by Anthony Lichnewsky 16 May '03

16 May '03

I had the following trouble setting up boost 1.29.0 on windows 2000 (using vc7, but that's not the point) the first thing bjam did (the version downloaded from sourceforge) was to erase all the files and folders in tools\ so that no build could be performed... setting those files to read-only was enough but that's an unexpected behaviour. Anthony Lichnewsky

2 3

Signals lib - causes mysterious multiple destructor calls
by Chuck Messenger 16 May '03

16 May '03

Testing out the Boost signals lib, I wrote: ----------- #include <boost/signal.hpp> #include <iostream> using namespace std; using namespace boost; struct X { void operator()(int val) { cout << "X <- " << val << endl; } X() { cout << "X constructor\n"; } ~X() { cout << "X destructor\n"; } }; int main() { { cout << " phase 1\n"; signal<void (int)> sig; cout << " phase 2\n"; X x; cout << " phase 3\n"; sig.connect(x); cout << " phase 4\n"; } cout << " phase 5\n"; return 0; } ------------------- The following output is generated (gcc3.2.2 on Mandrake 9.1): ------------------------ phase 1 phase 2 X constructor phase 3 X destructor X destructor X destructor X destructor X destructor X destructor X destructor X destructor phase 4 X destructor X destructor phase 5 ------------------------ Why the multiple calls to X's destructor? I'd have expected just one. It looks like the signals lib is misbehaving. Can anyone offer an explanation? - Chuck

3 2

lambda library: how to use io manipulators?
by Chuck Messenger 16 May '03

16 May '03

The following compiles: (cout << _1 << "\n")(x); but this doesn't: (cout << _1 << endl)(x); (gcc 3.2.2) I can't figure out how to use an io manipulator within a lambda function. Firstly, how do I do it? (e.g. suppose I want to use flush, for which there is no workaround like using "\n"). Secondly, a suggestion: it would be nice if support was built in for the io manipulators. - Chuck

1 0

is_base_and_derived broken in 1.30.0?
by Jeff Muller 15 May '03

15 May '03

Originally posted this on 5/6, but it never showed up. Here goes again... Hi, The following code: const bool isWS = ::boost::is_base_and_derived<std::wstring,std::wstring>::value; sets isWS false with VS.NET 2003 (_MSC_VER=1310) in version 1.30.0 of the libraries. It is correct with version 1.27.0. Thanks, Jeff

2 1

Using the Python interpreter
by dima_mouromtsev 15 May '03

15 May '03

Hello All! I've the problem with the next code: class MyWindow { ... MyWindow() {} ~MyWindow() {} MyOperation() { Py_Initialize(); handle<> main_module(borrowed(PyImport_AddModule("__main__"))); handle<> namespace(borrowed(PyModule_GetDict(main_module.get()))); try { handle<>(PyRun_String("hello = file('c:\\hello.txt', 'w')\n" "hello.write('Hello world!')\n" "hello.close()", Py_file_input, namespace.get(), namespace.get())); } catch(error_already_set) { ... } Py_Finalize(); } }; When I start this code, that's all right. If I move Py_Finalize() to destructor, the program work, but when I close the program an exeption rise (Py_FatalError("UNREF invalid object")). Next, I exclude Boost classes: ... MyOperation() { PyObject* dict = PyModule_GetDict(PyImport_AddModule("__main__")); PyRun_String("hello = file('c:\\hello.txt', 'w')\n" "hello.write('Hello world!')\n" "hello.close()", Py_file_input, dict, dict); } So the program work well and there is no exeptions at exit. What is my problem? How can I use Boost in right way? Please Help Thanks Dima

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shared_from_this from a destructor
by ostware 15 May '03

15 May '03

(This message is also posted on sourceforge. Please forgive the double posting, but I am still unfamiliar with the community...) version: boost 1.30.0 library: smart pointers I am using the boost::enable_shared_from_this base class from the smart pointer library to implement shared_from_this in my classes. I was amazed to find this class, after hours of thashing trying even to figure out the very problem it solves. So, first off, thanks to the boosters. My problem is that shared_from_this() throws boost::bad_weak_ptr if called from my class's destructor. Is this a design decision? a bug? am I misreading a class requirement? The problem (if it is one...) is that sp_counted_base::release() decrements use_count_ before calling dispose(). Then when my class calls shared_from_this from its destructor (via dispose()), sp_counted_base::add_ref fails (use_count == 0) and throws boost::bad_weak_ptr. I would suggest either setting use_count_ after dispose(), or clarifying in the docs that shared_from_this can't be called from a destructor. (... which would send me back to the drawing board to solve my problem) It would also be handy to have an exception less version of share_from_this which justs returns a null shared_ptr. Thanks for any help. ... Michael Ost Something like this (warning: uncompiled, untested!) ... class T : public enable_shared_from_this { public: T() {} ~T() { shared_ptr<T> ptr = shared_from_this(); // trouble: exception, can't get a shared_ptr } }; main() { shared_ptr<T> ptr = shared_ptr(new T()); ptr.reset(); }

2 3

? Using std::max_element() on a multi_array
by Neil Mackie 15 May '03

15 May '03

I'm looking for advice on using std::max_element() with boost::multi_array. When passing a multi_array to max_element() I was expecting to get an iterator referring to the largest element in return. However my compiler tells me the iterator refers to a sub_array<class RAClass::RAPoint,1> instead, and I don't know why or what to do about it. Its clear that inexperience with multi_array and max_element() is the cause. Is anyone able to shed some light on the subject? Details: ―--- .h file ―--- namespace RAClass { typedef boost::multi_array<RAPoint,2> CELL_TABLE; CELL_TABLE* m_cells; ―--- .cpp file ―--- CELL_TABLE::iterator e = std::max_element(m_cells->begin(),m_cells->end(), RAPoint::lower); // RAPoint::lower() compares two RAPoints int height = e->getHeight(); ―--- compiler output ―--- getHeight' : is not a member of 'sub_array<class RAClass::RAPoint,1>' TIA Neil (J Mackie). By the end of this year the Radiocommunications Agency and all responsibility for regulating the radio spectrum and communications services will become part of Ofcom - the new converged regulator for the communications sector. See the Ofcom transitional website at www.Ofcom.org.uk for more details.

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BGL - misc problems encountered
by Chuck Messenger 14 May '03

14 May '03

I've been testing out the BGL, and have found some small problems. Is this a good forum to post these? If not, please set me straight. I have in mind to post more of these -- in the interest of helping iron out the library. Maybe the developer list would be more appropriate? Or a BGL-specific list, if one exists...? Problem 1: In the documentation, under "Using adjacency_list", subsection "Custom Edge Properties", it shows a method for declaring a custom property tag: > struct flow_t { > typedef edge_property_tag kind; > }; > > struct capacity_t { > typedef edge_property_tag kind; > }; It goes on to say that an alternative method is this: > enum edge_myflow_t { edge_myflow }; > enum edge_mycapacity_t { edge_mycapacity }; > > namespace boost { > BOOST_INSTALL_PROPERTY(edge, myflow); > BOOST_INSTALL_PROPERTY(edge, mycapacity); > } In the rest of the code included in the documentation, it uses the first method. Finally, it says: > The file edge_property.cpp shows the complete source code for this example. However, the code in edge_property.cpp is completely different -- using the second method rather than the first. So, at a minimum, the final sentence is wrong. I suggest the alternative methods should both be shown in the sample code. I made the necessary changes to edge_property.cpp -- here's the diff (against Boost release 1.30.0): 78a79,88 > #define ALTERNATE // comment this out to see an alternate method > > #ifdef ALTERNATE > struct flow_t { > typedef edge_property_tag kind; > }; > struct capacity_t { > typedef edge_property_tag kind; > }; > #else 86c96 < --- > #endif 95c105,109 < property_map<Graph, edge_mycapacity_t>::const_type --- > #ifdef ALTERNATE > typename property_map<Graph, capacity_t>::const_type capacity = get(capacity_t(), G); > typename property_map<Graph, flow_t>::const_type flow = get(flow_t(), G); > #else > typename property_map<Graph, edge_mycapacity_t>::const_type 97c111 < property_map<Graph, edge_myflow_t>::const_type --- > typename property_map<Graph, edge_myflow_t>::const_type 98a113 > #endif 125a141,145 > #ifdef ALTERNATE > typedef property<capacity_t, int> Cap; > typedef property<flow_t, int, Cap> Flow; > typedef adjacency_list<vecS, vecS, bidirectionalS, no_property, Flow> Graph; > #else 129a150 > #endif 163a185,188 > #ifdef ALTERNATE > property_map<Graph, flow_t>::type > flow = get(flow_t(), G); > #else 165a191 > #endif Problem 2: edge_proprety.cpp, as included in Boost release 1.30.0, generates warnings under gcc 3.2.2, since it is missing a couple of typenames. Here's the needed patch: 95c95 < property_map<Graph, edge_mycapacity_t>::const_type --- > typename property_map<Graph, edge_mycapacity_t>::const_type 97c97 < property_map<Graph, edge_myflow_t>::const_type --- > typename property_map<Graph, edge_myflow_t>::const_type - Chuck

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RE: [Boost-Users] Re: find_if and calling a member function
by Tom Matelich 14 May '03

14 May '03

> From: Russell Hind [mailto:yg-boost-users@gmane.org] > > Tom Matelich wrote: > > > > 1) write your own algorithm find_if_equal, then you only > need one bind (~10 > > lines of code separate from your call) > > This is what I was looking for, and I was really wondering (although > didn't say it) if there were such a thing in boost already. > I haven't > found one, but there are quite a few bits of boost I'm not > familiar with > yet. > I don't think boost has any extra general algorithms laying around, unless they're hiding in the details directories. ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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Question regarding boolalpha and lexical_cast for 1.30.0
by Paul Wendt 14 May '03

14 May '03

Hello, I'm trying to get lexical_cast to convert a std::string to bool; I realize that this is done with normal IOStreams by using boolalpha. Is there a way to do this with lexical_cast? I saw some old posts in the archives and they were apparently with older code bases because I was unable to get their code snippets to work properly [either that or my compiler is messed up :)]. For reference, I use Visual Studio .NET 2002. Thank you very much for any assistance in advance. --Paul

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RE: [Boost-Users] indentation vs. braces
by Ben Hutchings 14 May '03

14 May '03

Ryan Barrett <rbarrett(a)stanford.edu> wrote: <snip> > incidentally - and this is *way* off-topic - python's control flow is > defined by indentation. iirc, it works just like you'd want. > > however, i should offer the disclaimer that that's pretty much all i > know about python, other than the fact that ESR likes it: <snip> Some people would consider the ESR association a flaw, but that's going way off-topic. However, I do know about Python and would recommend pretty much all programmers to have a look at it.

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RE: [Boost-Users] find_if and calling a member function
by Tom Matelich 14 May '03

14 May '03

Define easier :) Not to be picky, but how little do you expect to have to type? 1) write your own algorithm find_if_equal, then you only need one bind (~10 lines of code separate from your call) 2) write a functor, ObjectNameCompare (less than 15 lines of code separate from your call) > -----Original Message----- > From: Russell Hind [mailto:yg-boost-users@gmane.org] > Sent: Tuesday, May 13, 2003 9:31 AM > To: boost-users(a)yahoogroups.com > Subject: [Boost-Users] find_if and calling a member function > > > I have an object that has a member get_name which returns a > string. I > have a collection of these objects and would like to find one with a > particular name. I am currently using find_if, equal and bind > > find_if(objects.begin(), objects.end(), > bind(equal_to<string>(), name, bind(&object::get_name, _1))); > > Given Lambda doesn't compile under BCB6, is there an easier way to do > this rather than having to make up 2 bind statements? > > Thanks > > Russell > > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Rent DVDs Online - Over 14,500 titles. > No Late Fees & Free Shipping. > Try Netflix for FREE! > http://us.click.yahoo.com/YoVfrB/XP.FAA/uetFAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > Info: <http://www.boost.org> > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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Test message from moderator
by Jim.Hyslop 13 May '03

13 May '03

My apologies for the noise, I'm trying to resolve some problems experienced by some users of this list. -- Jim Hyslop Moderator, Boost-users(a)yahoogroups.com

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Inconsistent regexp matching when using quantifiers?
by Dean 13 May '03

13 May '03

Hi all, I'm using regexp from boost-1.28 and experience the following behavior. Consider the following (somewhat artificial) regexp pattern: a{1}b As I expected, that pattern is found in "ab" but not "aab". To my suprise however, the same pattern *is* found in "aaab", "aaaaab", and any other string consisting of an odd number of "a"s followed by a "b". It is not found in strings consisting of an even number of "a"s followed by a "b". This seems odd (no pun intended). I see the same sort of behavior with quantifiers other than "{1}" and where the quantified expression matches other single characters. (Oddly enough, the behavior changes when using a quantified expression that matches multiple characters. "(ab){1}c" is found in "abc", "ababc", "abababc", and any other string containing "abc".) FWIW, I first observed the behavior when trying to find social security numbers with the following pattern: \d{3}-\d{2}-\d{4} As expected, that pattern was found in "123-12-1234" but not in "1234- 12-1234". However it *was* found in "1234567-12-1234". Is this behavior by design or is it a bug? If it's a bug, has it been fixed in a subsequent boost release? Also what is the correct behavior? Should "a{1}b" be found in "aab" (albeit starting at the second character)? FWIW, it's easy enough for me to workaround the current behavior with a pattern like this: (^|[^a])a{1}b Thanks, --Dean

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find_if and calling a member function
by Russell Hind 13 May '03

13 May '03

I have an object that has a member get_name which returns a string. I have a collection of these objects and would like to find one with a particular name. I am currently using find_if, equal and bind find_if(objects.begin(), objects.end(), bind(equal_to<string>(), name, bind(&object::get_name, _1))); Given Lambda doesn't compile under BCB6, is there an easier way to do this rather than having to make up 2 bind statements? Thanks Russell

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RE: [Boost-Users] boost::thread IDs
by Ben Hutchings 13 May '03

13 May '03

Mark Sizer wrote: > I know there was a discussion about the need for these and why > they're not in the library. I can't find it, however. > > I'm having the same problem the original poster had: I'm using > the thread ID as an identifier in a data structure (std::map in > this case). You can do that with Windows thread IDs, because they are simple integers. Unfortunately the Posix thread ID type (pthread_t) is an abstract data type and the only relation defined on it is equality (pthread_equal()). Some implementations use a type that can safely and correctly be compared with std::less, but there's no guarantee of that, so Boost can't offer such a guarantee either. > Now that I'm converting to the Boost threads library, I have to > change that. I'm not sure what to do instead. > > Any help, either a pointer to the original discussion or direct > suggestions, will be much appreciated. How about using pointers to boost::thread objects as IDs (they must of course be the instances used to start the thread, rather than instances created with the default constructor). Store each thread's own pointer in TLS (or TSS as Boost.Threads calls it). (This is tricky, though - you can't pass a thread's own ID to its initial function, as threads start to run immediately. I suppose you could use placement new, but that's a bit gross.) What's the need for thread IDs, anyway? Are you using a thread pool?

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boost::thread IDs
by Mark Sizer 13 May '03

13 May '03

I know there was a discussion about the need for these and why they're not in the library. I can't find it, however. I'm having the same problem the original poster had: I'm using the thread ID as an identifier in a data structure (std::map in this case). Now that I'm converting to the Boost threads library, I have to change that. I'm not sure what to do instead. Any help, either a pointer to the original discussion or direct suggestions, will be much appreciated. Thanks, - Mark P.S. Other than this glitch, my ObjectSpace Toolkit removal has been painless. Great libraries!

2 1

scope of locked variables
by Peter G 12 May '03

12 May '03

hi there... what is the scope of locked variables? assuming that i declare a mutex in say a class scope.. and then lock it in some inner scope - say in a function.. what variables get locked? is it all the variables which are in the scope of the declaration (ie all the variables which are declared in the class)? or is it only the ones which are being used in that particular function (so that perhaps another thread could use the rest at "the same time")? for example: class Class1 { public: Class1::Class1(); ~Class1::Class1(); void f(int new) { boost::mutex::scoped_lock scoped_lock(mutex_outer) ; var1 = new; } void g(int new) { boos::mutex mutex_inner; boost::mutex::scoped_lock scoped_lock(mutex_inner) ; var1 = new; } private: boost::mutex mutex_outer; Class2 some_member_object; int var1; int var2; }; what gets locked when f() is called? when should i use g()? how do I go about just locking say var1 but NOT var2? if i lock the mutex in this class scope, does that mean that all the variables in some_member_object are locked as well? also, should i set up locks anytime i am using an object which might be accesses by another thread (even if I am just reading it) or is it enough to only lock variables when i am changing them? i know that's a lot of questions, but any help would be greatly appreciated. cheers peter

3 3

[uBLAS] binary operation of vector and matrix with different type
by Zhang Le 12 May '03

12 May '03

hi, the following code generates a compile error raising from a macro in /ublas/traits.hpp: BOOST_STATIC_ASSERT ((boost::is_same<T1, T2>::value)); Because I'm trying to prod on a vector of size_t and a matrix of unsigned char. Because I want to save memory (the matrix is really huge) and I know the value in m will never exceed 255. The expression is ok to me (of course the result value is size_t). But the ASSERT prevent me from doing this. Is there a workaround that permits me doing this kind of case without sacrificing the memory efficiency? Using size_t in the matrix will use three times more memory. ublas::vector<size_t> v1(5); matrix<unsigned char> m(5,5); prod(m,v1); the same problem arises when I do prod(m,v2); here v2 is a vector<double> -- Sincerely yours, Zhang Le

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Re: (Spirit) Semantic Actions with member functions?
by Slava Akhmechet 11 May '03

11 May '03

I was able to get boost::bind working to bind the semantic action to the member function of MyGrammar. This seems like a superior solution. In any case, I am not sure how to pass custom data to a functor. When specifing a semantic action I have to pass the type of the functor, which implies that spirit creates a temporary object. Am I missing something? > Its time to switch your global function "myaction" into a functor. > Functors are classes that have a function call operator with the same > synopsis as your function. > The advantage is that one can pass custom data to it via a non-default > constructor. > > Functors should be and sometimes must be stateless, so care must be > employeed to use references in member data. > > Slava Akhmechet wrote: > > > I am playing around with Spirit and I seem to run into an architecture > > problem with semantic actions. Here's a small example. > > > > class MyGrammar : public grammar<MyGrammar> > > { > > public: > > template <typename ScannerT> > > struct definition > > { > > definition(MyGrammar const& self) > > { > > TestRule = str_p("test")[&my_action]; > > } > > > > rule<ScannerT> const& > > start() const { return TestRulet; }; > > > > private: > > rule<ScannerT> TestRule; > > }; > > }; > > > > My major problem is related to the fact that I cannot pass any custom > > data to my_action function. Since my_action is a global function, it > > has no knowledge of MyGrammar and must rely on global variables. > > Ideally, I would pass self to my_action to be able to hold state. What > > is a general way to get around this problem? The documention mentions > > a way to specify member functions as semantic action actors using > > boost's bind facilities but I was unable to get it to work. > > Thanks in advance. > > > > P.S. Sorry for a fairly newbie question, I was unable to find the > > answer online or in the docs. > > P.P.S. I might have accidently double posted this. Sorry about that. > > > > > > > > *Yahoo! Groups Sponsor* > > > > <http://rd.yahoo.com/M=247865.3269369.4566997.1261774/D=egroupweb/S=17050067…> > > > > > > > > Info: <http://www.boost.org> > > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> [mailto:boost-users-unsubscribe@yahoogroups.com>] > > > > > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service > > <http://docs.yahoo.com/info/terms/>. > > > > > Info: <http://www.boost.org> > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> [mailto:boost-users-unsubscribe@yahoogroups.com>] > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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RE: [Boost-Users] Re: Why isn't the "last access time" part of the filesystem library?
by Ben Hutchings 11 May '03

11 May '03

Beman Dawes wrote: > At 06:13 AM 5/8/2003, Peter Dimov wrote: <snip> > >This is a misunderstanding. Last access time (struct > >stat::st_atime) and creation time (st_ctime) aren't universal. Unix's ctime is actually change time, not creation time - it is the time when certain metadata were last changed. > >Modification time (st_mtime) is common, except on read-only > >filesystems, which typically only have ctime. > > > >Judging by your "last altered" remark, you mean mtime but call > >it "last access." > > > >I think that it would be entirely reasonable (and very useful - > >can avoid reading a file if it hasn't changed since last read) > >to provide mtime. On read-only filesystems, the creation time > >should be returned. You're mixing the concepts of filesystem API and the filesystem on disk. Normally the same filesystem API can be used for any file- system supported by the OS, and file times on an inherently read- only filesystem can appear as modification time and (if the OS supports the notion) as creation or change time. > Yes, I had a similar thought. > > What format should be used to report the mtime? I'd prefer to > keep the coupling to other Boost libraries low, so I guess that > would mean just using std::time_t. That also has the advantage > of not promising higher resolution than can actually be > delivered by most platforms. Seems reasonable to me. > What to do if the filesystem doesn't attach any time at all to > a file? Fail at compile time? Always return some date in the > past, like January 1, 1900, that is impossible as a real mdate > (since computers were not invented yet) and so can be relied > upon to indicate "no date available"? Use std::time_t(-1) to be consistent with std::time and std::mktime.

2 2

MSVC 6.0 and BOOST_HAS_PARTIAL_STD_ALLOCATOR
by Joaquín Mª López Muñoz 10 May '03

10 May '03

Shouldn't BOOST_HAS_PARTIAL_STD_ALLOCATOR be defined for MSVC 6.0? Seems it is not. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

2 1

(Spirit) Semantic Actions with member functions?
by Slava Akhmechet 09 May '03

09 May '03

I am playing around with Spirit and I seem to run into an architecture problem with semantic actions. Here's a small example. class MyGrammar : public grammar<MyGrammar> { public: template <typename ScannerT> struct definition { definition(MyGrammar const& self) { TestRule = str_p("test")[&my_action]; } rule<ScannerT> const& start() const { return TestRulet; }; private: rule<ScannerT> TestRule; }; }; My major problem is related to the fact that I cannot pass any custom data to my_action function. Since my_action is a global function, it has no knowledge of MyGrammar and must rely on global variables. Ideally, I would pass self to my_action to be able to hold state. What is a general way to get around this problem? The documention mentions a way to specify member functions as semantic action actors using boost's bind facilities but I was unable to get it to work. Thanks in advance. P.S. Sorry for a fairly newbie question, I was unable to find the answer online or in the docs. P.P.S. I might have accidently double posted this. Sorry about that.

3 2

Help using Boost Graph Library with C++Builder 6
by asterixthegaul2003 09 May '03

09 May '03

Hi, Has anyone successfully used to Boost Graph Library (BGL) with C++Builder 6? I'm getting compilation errors. Here's what I've done: I downloaded the latest Boost (1.30.0) from boost.org and installed it. I then tried to compile the quick-tour.cpp file using the mingw compiler - no problem. I then tried to compile using the C++Builder IDE and I get the following compile errors: [C++ Error] tuple_basic.hpp(158): E2238 Multiple declaration for 'element<N,T>' [C++ Error] tuple_basic.hpp(143): E2344 Earlier declaration of 'element<N,T>' I also tried using the command line compiler (bcc32.exe - version 5.6), but get the same errors (and more). Can someone tell me what I'm doing wrong? Do I need to do something special to prepare the boost libraries for use with Borland (e.g., using the Boost Jam stuff)? Some of the documentation said I should only have to set the include path. This seemed to work with mingw. Thanks, Craig

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RE: [Boost-Users] Re: Why isn't the "last access time" part of the filesystem library?
by Ben Hutchings 09 May '03

09 May '03

richard_fanta <richard.fanta(a)morganstanley.com>: > --- In Boost-Users(a)yahoogroups.com, "Ben Hutchings" > <ben.hutchings@b...> wrote: > > richard_fanta <richard.fanta@m...> wrote: > > > Beman Dawes <bdawes@a...> wrote: > > > > At 01:02 AM 5/6/2003, richard_fanta wrote: > > > > >Looking at the filesystem library and the attributes work in > > > > >boost-sandbox, I don't immediately see "last access time" > > > > >being available for a file or directory. > > > > > > > > > >"Last access time" was included in Dietmar Kuehl's original > > > > >dir_it. > > > > > > > > > >Can someone kindly tell me why this was removed? It's highly > > > > >useful, and part of every filesystem that I've seen. <snip> > > > > Perhaps we should do more to support attribute query within the > > > > main library, but I don't really think we should include any > > > > that aren't reliably supported by at least POSIX, Windows, and > > > > ISO-9660 systems. > > > > > > Your point is well made. However, it does seem odd that a > > > feature that is useful for >95% of all typical usage shouldn't be > > > in the library. > > > > What does that figure refer to, if anything? > > Typical application usage. Yes, mileage can vary. > > Out of the last 50 apps you wrote that did file access, how many > involved CD-ROMS/DVDs that were ISO 9660 filesystems? I think most of them could quite happily have worked with files on CD-ROMs, but then I tend to write general-purpose code rather than very specific applications. A few of them needed to know file modification times. <snip> > > and updates to them may be disabled because the volume is read- > > only (whether or not the underlying medium is read-only) or > > purely to avoid the cost of updating them. > > Even if the volume is read-only from one machine, it might still > help to know when the file was last altered. > > > Note that Windows NT maintains > > access times at quite a low resolution, to reduce this cost. > > Low resolution or not, it's there. When the file changes, the > timestamp is updated. That's information that many applications > would find useful. <snip> What you're talking about is the modification time, not the access time. I agree that *that* is useful and widely supported, but it's not what you were originally asking for!

1 0

combinations of boost::condition
by Joshua Napoli 09 May '03

09 May '03

Is there any way to wait for one of several condition objects to become ready? Is there some reason that this capability is omitted from the thread library? I would like to do something like this: mutex monitorA, monitorB; condition conditionA, conditionB; double_condition conditionAB(conditionA,conditionB); void executeNextEvent() { lock lkA(monitorA); lock lkB(monitorB); //Wait for either conditionA or conditionB to become ready. conditionAB.wait(lkA,predicateA,lkB,predicateB); if(predicateA()) { executeEventA(); } else { executeEventB(); } } [Non-text portions of this message have been removed]

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RE: [Boost-Users] Re: Why isn't the "last access time" part of the filesystem library?
by Ben Hutchings 08 May '03

08 May '03

richard_fanta <richard.fanta(a)morganstanley.com> wrote: > Beman Dawes <bdawes@a...> wrote: > > At 01:02 AM 5/6/2003, richard_fanta wrote: > > > > >Looking at the filesystem library and the attributes work in boost- > > >sandbox, I don't immediately see "last access time" being available > > >for a file or directory. > > > > > >"Last access time" was included in Dietmar Kuehl's original dir_it. > > > > > >Can someone kindly tell me why this was removed? It's highly useful, > > >and part of every filesystem that I've seen. > > > > ISO/IEC 9660:1999 filesystems don't supply a "last access" time stamp, > > perhaps because the original uses were on write-once media. > > Which filesystems adhere to this spec other than CD-ROMs? Many DVDs use this too, but for most purposes they're basically just higher-capacity CDs. > > Perhaps we should do more to support attribute query within the main > > library, but I don't really think we should include any that aren't > > reliably supported by at least POSIX, Windows, and ISO-9660 systems. > > Your point is well made. However, it does seem odd that a feature > that is useful for >95% of all typical usage shouldn't be in the > library. What does that figure refer to, if anything? > Other options: > -For ISO 9660 filesystems, use the time created as the "last > access" time stamp. > -Throw a "FeatureNotSupportedException" or somesuch. Then the feature won't be at all portable, and might as well not be supported at all. Access times are far from a universal OS feature, and updates to them may be disabled because the volume is read-only (whether or not the underlying medium is read-only) or purely to avoid the cost of updating them. Note that Windows NT maintains access times at quite a low resolution, to reduce this cost.

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RE: [Boost-Users] call_traits and MSVC 7.1
by Randy Bowen 08 May '03

08 May '03

Thanks for the info. This is illegal code. That it compiled in MSVC 7.0 was a bug. The template parameter '_Source' can not be deduced from the callsite of doSomething. 14.8.2.4 in the ISO/IEC 14882 lists the forms in which template parameters can be deduced, but a qualified name involving nested types is not one of them. I suspect it's because of something like this: [Non-text portions of this message have been removed]

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Compiling smart_ptr library
by l＠lo 08 May '03

08 May '03

Hi everybody! I'm trying to compile the smart_ptr library using the Jamfile in the test directory. Some of the test *.cpp files are compiled successfully, but some of them drops the following error: sunpro-Link-action ../../../libs/smart_ptr/test/bin/shared_ptr_alloc_ test.test/sunpro/debug/runtime-link-dynamic/shared_ptr_alloc_test Undefined first referenced symbol in file boost::__RTTI__1nFboostPchecked_deleter4nBZ___ /rest/proj/users/kercsoj/boost/boost_1_30_0/libs/s mart_ptr/test/bin/shared_ptr_alloc_test.test/sunpr o/debug/runtime-link-dynamic/ SunWS_cache/CC_obj__/_iANwWXwaw2nbnjBybyL.o [Hint: static member boost::__RTTI__1nFboostPchecked_deleter4nBZ___ must be defined in the program] It's seems, it is a common error, because it appears several times in the error output of the compiler. Has anybody any ideea, why this error message comes, and how could be corrected? Thanks, lalo

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Indirect Iterator Adaptor, std::set and MSVC 6.5
by Joaquín Mª López Muñoz 08 May '03

08 May '03

The following produces an internal compiler crash in MSVC 6.5 #include <set> #include <boost/iterator_adaptors.hpp> int main() { typedef std::set<int *> type0; typedef boost::indirect_iterator_generator< type0::iterator,const int>::type type1; type0 s; type1 it(s.begin()); return 0; } This happens for std::set only, using say std::vector instead works fine. Is some workaround known? TIA Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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Regex issue under Visual Studio 2003
by Frank Schwab 08 May '03

08 May '03

I have an inherited VC++ program that I am trying to port to Microsoft Visual Studio 2003 (it compiles and runs fine in Visual Studio 6.0). I've downloaded the 1.30.0 release, and the following problem still occurs. The (exceptionally) verbose error message I receive from the compiler is: error C2664: 'bool boost::regex_match<std::char_traits<char>,std::allocator<_Ty>,Allocator,char ,boost::regex_traits<charT>,std::allocator<_Ty>>(const std::basic_string<_Elem,_Traits,_Ax> &,boost::match_results<iterator,Allocator> &,const boost::reg_expression<charT,traits,Allocator> &,unsigned int)' : cannot convert parameter 2 from 'boost::cmatch' to 'boost::match_results<iterator,Allocator> &' with [ _Ty=char, Allocator=std::allocator<char>, charT=char, _Elem=char, _Traits=std::char_traits<char>, _Ax=std::allocator<char>, iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>> ::const_iterator, traits=boost::regex_traits<char> ] and [ iterator=std::basic_string<char,std::char_traits<char>,std::allocator<char>> ::const_iterator, Allocator=std::allocator<char> ] The Code fragment I get the error on is: // lpcszDeviceName is a function parameter defined as LPCTSTR lpcszDeviceName TSTRING strName = lpcszDeviceName; boost::regex expr("IW\\s+[A-Za-z]+\\s+([0-9]+)"); boost::cmatch matches; if (boost::regex_match(strName, matches, expr)) { ... } with the error message pointing to: if (boost::regex_match(strName, matches, expr)) This may be related to a Microsoft note: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html /vclrfsomeiteratorsarenolongersameaspointers.asp but, then again, it may not. Anyone have any suggestions? I am well out of my depth in trying to understand the incantations here, and have a dozen spots in the code where this occurs. TIA, /frank

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call_traits and MSVC 7.1
by Randy Bowen 08 May '03

08 May '03

We have been using call_traits from Boost version 1.29.0 in conjunction with MSVC 7.0. When attempting to recompile this code under MSVC 7.1, using either Boost 1.29.0 or 1.30.0, we now encounter compilation errors. A simple example of the usage pattern is: ############################################################### #include <boost/call_traits.hpp> class A { public: template<typename _Source> void doSomething ( typename boost::call_traits<_Source>::param_type value ) { } }; class B { public: explicit B(double d = 1.0, int i = 42) : _d(d), _i(i) {} B(B const& b) : _d(b._d), _i(b._i) {} private: double _d; int _i; }; extern "C" int main(int argc, char* argv[]) { A a; B b; a.doSomething(b); return 0; } ############################################################# The new compiler generates the error message: c:\Documents and Settings\rbowen\My Documents\Projects\CallTraitsTest\CallTraitsTest.cpp(34) : error C2783: 'void A::doSomething (boost::call_traits<_Source>::param_type)' : could not deduce template argument for '_Source' c:\Documents and Settings\rbowen\My Documents\Projects\CallTraitsTest\CallTraitsTest.cpp(11) : see declaration of 'A::doSomething' As an experiment, I manually included the older logic for call_traits by cutting and pasting the relevant classes into my source from 'detail/ob_call_traits.hpp' and still encountered the same error. Has anyone else experienced this? Is this (yet another) MS compiler bug?

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Static thread library missing in 1_30_0
by yss15632 08 May '03

08 May '03

Hi, I am using boost on a linux system. I upgraded from boost_1_29_0 to 1_30_0. However, if I build the library just by typing "bjam" I cannot find the static library libboost_thread.a, in contrary to version 1_29_0. How can I generate it? Thank you very much, Stefan

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