- Boost-users - lists.boost.org

Unit Test problem with wstrings
by Sean Rohead 15 Nov '05

15 Nov '05

I am using the Boost Unit Test library and have code that uses the BOOST_CHECK_EQUAL macro with std::wstring instances. I get a compilation error when I do this because there is no operator<< defined for a narrow ostream and a wide string. So, I created one as shown below, but I am still getting the exact same compilation error (using MSVC 2003). With my new operators, I am able to manually insert wide strings into a narrow ostream, but the BOOST_CHECK_EQUAL macro expansion still doesn't seem to be picking it up. Any ideas? Thanks, Sean Rohead <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< #include <string> #include <iostream> std::wstring widen(const std::string& source) { std::wstring result(source.size(), wchar_t(0)); typedef std::ctype<wchar_t> ctype_t; const ctype_t& ct = std::use_facet<ctype_t>(std::locale()); ct.widen(source.data(), source.data() + source.size(), &(*result.begin())); return result; } std::string narrow(std::wstring source) { std::string result(source.size(), char(0)); typedef std::ctype<wchar_t> ctype_t; const ctype_t& ct = std::use_facet<ctype_t>(std::locale()); ct.narrow(source.data(), source.data() + source.size(), '\u00B6', &(*result.begin())); return result; } std::ostream& operator<<(std::ostream& out, const std::wstring& value) { out << narrow(value); return out; } std::wostream& operator<<(std::wostream& out, const std::string& value) { out << widen(value); return out; } #include <boost/test/unit_test.hpp> void main() { std::string message("message"); std::wstring wmessage(L"MESSAGE"); // THESE TWO LINES COMPILE AND WORK FINE std::wcout << message << std::endl; std::cout << wmessage << std::endl; // THIS LINE STILL DOES NOT COMPILE BOOST_CHECK_EQUAL(wmessage, std::wstring(L"message")); } >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ------ Build started: Project: boost, Configuration: Debug Win32 ------ Compiling... main.cpp c:\lib\boost_1_32_0\boost\test\test_tools.hpp(207) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'const std::wstring' (or there is no acceptable conversion) c:\lib\boost_1_32_0\boost\test\test_tools.hpp(206) : while compiling class-template member function 'void boost::test_tools::tt_detail::print_log_value<T>::operator ()(std::ostream &,const T &)' with [ T=std::wstring ] c:\lib\boost_1_32_0\boost\test\test_tools.hpp(251) : see reference to class template instantiation 'boost::test_tools::tt_detail::print_log_value<T>' being compiled with [ T=std::wstring ] c:\lib\boost_1_32_0\boost\test\detail\wrap_stringstream.hpp(69) : see reference to function template instantiation 'std::ostream &boost::test_tools::tt_detail::operator <<<Left>(std::ostream &,const boost::test_tools::tt_detail::print_helper<T> &)' being compiled with [ Left=std::wstring, T=std::wstring ] c:\lib\boost_1_32_0\boost\test\test_tools.hpp(438) : see reference to function template instantiation 'boost::basic_wrap_stringstream<CharT> &boost::operator <<<char,boost::test_tools::tt_detail::print_helper<T>>(boost::basic_wrap _stringstream<CharT> &,const boost::test_tools::tt_detail::print_helper<T> &)' being compiled with [ CharT=char, T=std::wstring ] c:\Documents and Settings\sean.rohead\My Documents\Visual Studio Projects\boost\main.cpp(43) : see reference to function template instantiation 'bool boost::test_tools::tt_detail::equal_and_continue_impl<std::wstring,std:: basic_string<_Elem,_Traits,_Ax>>(const Left &,const Right &,boost::wrap_stringstream &,boost::test_tools::const_string,size_t,boost::unit_test::log_level,siz e_t)' being compiled with [ _Elem=wchar_t, _Traits=std::char_traits<wchar_t>, _Ax=std::allocator<wchar_t>, Left=std::wstring, Right=std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator <wchar_t>> ] Build log was saved at "file://c:\Documents and Settings\sean.rohead\My Documents\Visual Studio Projects\boost\Debug\BuildLog.htm" boost - 1 error(s), 0 warning(s) ---------------------- Done ---------------------- Build: 0 succeeded, 1 failed, 0 skipped

3 3

Boost and fastcall
by Marcus Krantz 15 Nov '05

15 Nov '05

Hi. I'm trying to integrate two applications. The first is configured to use fastcall and the other is using cdecl... The thing is that I get linking errors which says that boost uses thiscall? eh. However, i can change the other application to use fastcall too, but when i try to link the integrated application it says as i mentioned earlier that boost uses thiscall. Can i configure boost to use whatever I want? regards Marcus

2 1

[serialization] About NaNs
by Topi Mäenpää 15 Nov '05

15 Nov '05

Robert, The std::numeric_limits class template has functions for this. I have used the following definition in my code: #ifndef NAN /** * Double-precision not-a-number. Some systems don't have the * C99-standard macro @p NAN defined. GNU gcc does as an extension, * but MSVC doesn't. */ # define NAN std::numeric_limits<double>::quiet_NaN() #endif I don't think serializing signaling NaNs makes any sense, so I suggest using the quiet version. The difference is that computing anything with quiet NaN produces a quiet NaN, whereas signaling NaN raises a FP exception. Furthermore, the result of computation with sNaN is not very well defined. I'd like to add one to your count of NaN users. I'm using it in many occasions, typically indicating an "undefined" or "not applicable" situation. Due to the aforementioned property, it is easy to track back calculation errors if undefined values are involved. (Just find the first non-NaN intermediate result.) Saving "I haven't yet defined the value of this formula" with a NaN makes sense to me. BR, Topi On Sun, 2005-11-13 at 16:02 -0800, Robert Ramey wrote: > Truth is, I don't even know how one goes about assigning a NaN or a > +/inf to floating/double variable !! > > Robert Ramey -- Topi Mäenpää CTO, Intopii +358 40 774 7749

1 0

[filesystem]Sorting based on equivalence information?
by Rush Manbert 14 Nov '05

14 Nov '05

Hi all, I have written a class around the glob_iterator class that W. Richard Johnson put into the file vault last year. My class finds all the paths and/or files matching a multi-level wildcard pattern. (i.e. the matching expressions may appear in more than one place, such as "/Users/*/MySource/??foo/*.cpp") I need to detect loops caused by links between directories, and I also want to detect multiple paths to the same file, and only keep one of them. The only method that I have come up with so far is to keep the paths that I have found in a collection and test each new path against all of them by calling equivalent() once for each collection member. Needless to say, this is a little slow when the number of files or directories becomes large. It could be faster if I only tested symlinks, but I think that the existence of hard links forces me to test everything. My first question: Can anyone suggest a better method of achieving the duplicates detection? My second question (This is probably directed at Beman Dawes): I read the code for equivalent(), and it seems like I could derive a class from path that would implement operator< in such a way that it sorted by the equivalence information, rather than by the path string. If I could sort the paths by their equivalence information, then I could binary search the collection when I look for duplicates. I would have to copy the code in equivalent(), which is an ugly thing to do, and I guess I would need to define all of the operators that are defined in path, since they are not virtual. Assuming that I did these things, though, does this sound like it's even valid? From the comments that I read in the equivalent() source, it seems that the file equivalence information can change, at least on a windows system. I guess I could create a handle_wrapper for each path that I add to the collection in order to keep the file from being moved while it's in the collection. Of course, I can't be the first person who has gone down this path, or the library would probably already support this sort of sorting. Is this just a stupid idea? Thanks, Rush

3 4

problem using stream class when calling read function
by Hendra Hidayat 14 Nov '05

14 Nov '05

Hi, I have a problem when using stream class from iostreams library. I have created a device class say GDevice using iostreams::device_tag and iostreams::input_seekable tag. In GDevice I 've declared and implemented read function inside GDevice class. I also create a stream class let's say GStream which derived from iostreams::stream<GDevice>. The problem was occured when I created object from GStream and call GStream's read function directly to read say n bytes data. The GStream's read function invoked GDevice's read function not in n bytes data but always in 4096 bits. I dont understand where this number came from. I'm using boost 1.33, gcc compiler version 4.0.2 under x86-64 bit suse linux. Can somebody help me? Faithfully yours Hendra Hidayat Geophysical Lab. Natural Physics Dept. Sepuluh Nopember Institute of Tech. __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com

1 0

DateTime parsing question
by Sean Rohead 14 Nov '05

14 Nov '05

I am trying to parse ISO datetime strings with millisecond resolution and the fractional seconds are being truncated. Am I doing something wrong in the following code? Thanks, Sean Rohead >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> #include <string> #include "boost/date_time/posix_time/posix_time.hpp" using namespace std; using namespace boost::posix_time; void main() { string dateString1 = "20051004T151801"; string dateString2 = "20051004T151801.123"; ptime timestamp1(from_iso_string(dateString1)); ptime timestamp2(from_iso_string(dateString2)); cout << timestamp1 << endl; cout << timestamp2 << endl; }

3 3

Re: [Boost-users] [serialization]
by Kevin Carroll 14 Nov '05

14 Nov '05

> On Sun, 2005-11-13 at 16:02 -0800, Robert Ramey wrote: > > > Truth is, I don't even know how one goes about assigning a NaN or a > +/inf to floating/double variable !! Not an expert here like you guys, but how about: #include <limits> double x_NaN = std::numeric_limits<double>::quiet_NaN(); double y_PlusInfinity = std::numeric_limits<double>::infinity(); double z_MinusInfinity = -std::numeric_limits<double>::infinity(); ... Also, here is some concise info on IEEE standard floating point numbers available from the Internet: The following notes are reproduced from http://stevehollasch.com/cgindex/coding/ieeefloat.html Infinity The values +infinity and -infinity are denoted with an exponent of all 1s and a fraction of all 0s. The sign bit distinguishes between negative infinity and positive infinity. Being able to denote infinity as a specific value is useful because it allows operations to continue past overflow situations. Operations with infinite values are well defined in IEEE floating point. Not A Number The value NaN (Not a Number) is used to represent a value that does not represent a real number. NaN's are represented by a bit pattern with an exponent of all 1s and a non-zero fraction. There are two categories of NaN: QNaN (Quiet NaN) and SNaN (Signalling NaN). A QNaN is a NaN with the most significant fraction bit set. QNaN's propagate freely through most arithmetic operations. These values pop out of an operation when the result is not mathematically defined. An SNaN is a NaN with the most significant fraction bit clear. It is used to signal an exception when used in operations. SNaN's can be handy to assign to uninitialized variables to trap premature usage. Semantically, QNaN's denote indeterminate operations, while SNaN's denote invalid operations. The definition of NaNs, signed zero and infinity, and denormalized numbers from "IEEE Standard for Binary Floating-Point Arithmetic", ANSI/IEEE Standard 754-1985, Institute of Electrical and Electronics Engineers, August 1985., is reproduced below. In the following, 'S' stands for the sign bit, 'E' for the exponent, and 'F' for the fractional part. The symbol 'u' stands for an undefined bit (0 or 1). Type S (1 bit) E (11 bits) F (52 bits) signaling NaN u 2047 (max) .0uuuuu---u (with at least one 1 bit) quiet NaN u 2047 (max) .1uuuuu---u negative infinity 1 2047 (max) .000000---0 positive infinity 0 2047 (max) .000000---0 negative zero 1 0 .000000---0 positive zero 0 0 .000000---0 Kevin Carroll

1 0

Boost.MultiArray + iterators
by Dennis Zickefoose 14 Nov '05

14 Nov '05

I have a simple two dimensional multi_array that I am trying to copy a row out of. This works, but I get a warning about a type conversion that I would like to get rid of. Example: boost::multi_array<double, 2> array(boost::extents[42][42]); std::vector<double> row(array[0].begin(), array[0].end()); This produces the following warning in VC++ 7.1: c:\Boost\include\boost-1_33\boost\multi_array\iterator.hpp(149) : warning C4244: '+=' : conversion from 'boost::detail::multi_array::array_iterator<T,TPtr,NumDims,Reference>::difference_type' to 'boost::detail::multi_array::array_iterator<T,TPtr,NumDims,Reference>::index', possible loss of data This is followed by a long string of support messages that ultimately point to the vector initialization. Yet the vector is successfully initialized with the range of values I expect. So what am I doing wrong here? I understand that [array.begin(), array.end()) is actually a range of sub-views, rather than a range of values...is this a side effect of this distinction? At the moment, I have replaced that with &array[0][0] to avoid the warning, but if possible I would like to go with the more reliable iterator interface in the future. Any suggestions/advice would be greatly appreciated. DZJr

2 3

Desperately in need of help!
by Marcus Krantz 14 Nov '05

14 Nov '05

Hi all! I have an application which uses STLport 5.0.0, libtorrent (which in turn uses Boost). What I have done is that I have compiled the boost libraries for msvc7.1-stlport. I only uses three, i.e. filesystem, date_time and thread. My boost version is 1.33.1 So the problem occurs when my application is linking. Then I get a lot of LNK2005 link errors. I have no problems with compiling my code and use the boost libraries it's only when I'm about to link it fails. The errors says, in general, that a lot of things already are defined in libboost_xxx_mt-sp... I guess that if I post some of my errors it will be easier for those who wants to help me :) So here we go... 1. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::operator+=(char const *)" (??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV01@PBD@Z) already defined in libboost_filesystem-vc71-mt-sp-1_33_1.lib(path_posix_windows.obj) 2. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > & __thiscall std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> >::erase(unsigned int,unsigned int)" (?erase@?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@QAEAAV12@II@Z) already defined in libboost_date_time-vc71-mt-sp-1_33_1.lib(greg_month.obj) 3. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: char __thiscall std::basic_ios<char,struct std::char_traits<char> >::widen(char)const " (?widen@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEDD@Z) already defined in libboost_thread-vc71-mt-sp-1_33_1.lib(once.obj) 4. msvcprtd.lib(MSVCP71D.dll) : error LNK2005: "public: class std::basic_ostream<char,struct std::char_traits<char> > * __thiscall std::basic_ios<char,struct std::char_traits<char> >::tie(void)const " (?tie@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEPAV?$basic_ostream@DU?$char_traits@D@std@@@2@XZ) already defined in libboost_thread-vc71-mt-sp-1_33_1.lib(once.obj) I would really appreciate if anyone could help me out here. Since I am new to C++ etc. I have major difficulties in intepreting the error messages. Best regards Marcus Krantz

2 1

vc-8_0-stlport
by Slava Tutushkin 14 Nov '05

14 Nov '05

Does anybody know if there are any plans about adding toolset support for Visual Studio 2005 with STLPort? In fact, I tryed to compile Boost 1.33.1beta using vc-8_0 toolset, but with STLPort installed. It was almost succeed not counting incorrect libraries naming (without -p- suffix in filenames). Slava Tutushkin mailto:aloner@aloner.ru

1 0