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RE: [Boost-users] Re: Copyright notice in redistributed object fi les
by Jim.Hyslop 21 May '04

21 May '04

David Abrahams wrote: > "Jim.Hyslop" <Jim.Hyslop(a)Leitch.com> writes: > > If your code is derived from Boost, i.e. you have taken the > Boost code and > > modified it, then I think whether or not you can put it in > the public domain > > will depend on the extent of your modifications. > > Though on that point I'm less certain, I'm still pretty sure that's > incorrect [IANAL]. Derivative works must carry the Boost license: Ah, of course. I forgot the "derivative works" part of the license. I should have reviewed the license before responding. My apologies. -- Jim Hyslop Senior Software Designer Leitch Technology International Inc. (http://www.leitch.com) Columnist, C/C++ Users Journal (http://www.cuj.com/experts)

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iterator_facade with proxy reference type
by gusz1＠freemail.hu 21 May '04

21 May '04

Hi, could please somebody tell me why the code below generates a compile-time error? The compiler I'm using is VC++ 7.1. The error generated is this: c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\algorithm(458) : error C2582: 'operator =' function is unavailable in 'item_proxy' c:\PROG\VCPP\xItFacadeReferProxy\xItFacadeReferProxy.cpp(102) : see reference to function template instantiation 'void std::generate<array_iterator,int(__cdecl *)(void)>(_FwdIt,_FwdIt,_Fn0)' being compiled with [ _FwdIt=Array_iterator, _Fn0=int (__cdecl *)(void) ] the location of the error in <algorithm>: template<class _FwdIt, class _Fn0> inline void generate(_FwdIt _First, _FwdIt _Last, _Fn0 _Func) { // replace [_First, _Last) with _Func() for (; _First != _Last; ++_First) *_First = _Func(); // ERROR HERE } To my best knowledge, item_proxy's operator= is public, so I don't understand why it is unavailable. Thx, Gus The code: ------------------------------------------------------------------------ // xItFacadeReferProxy.cpp : Defines the entry point // for the console application. #include "stdafx.h" #include <algorithm> #include <boost/iterator/iterator_facade.hpp> using namespace boost; using namespace std; // THIS CLASS IS GOING TO BE 'STL'IZED': const int ARRAY_SIZE = 10; class Array { public: int Get(int i) const { return data[i]; } int Set(int i, int val) { data[i] = val; } private: int data[ARRAY_SIZE]; };//class Array class item_proxy; class Array_iterator : public iterator_facade < Array_iterator, int, // VALUE TYPE boost::random_access_traversal_tag, item_proxy // REFERENCE TYPE > { public: class item_proxy { public: item_proxy(const Array_iterator &it): m_rIterator(it) {} item_proxy& operator=(int i) { m_rIterator.m_pArray-> Set(m_rIterator.m_index, i); return *this; } item_proxy& operator=(item_proxy const& rhs) { operator=((int)rhs); return *this; } operator int() const { return m_rIterator.m_pArray-> Get(m_rIterator.m_index); } private: Array_iterator const &m_rIterator; };//class item_proxy public: Array_iterator():m_pArray(0) {} Array_iterator(Array& array, int index = 0): m_pArray(&array), m_index(0) {} private: friend class boost::iterator_core_access; void increment() { ++m_index; } void decrement() { --m_index; } void advance(int n) { m_index += n; } int distance_to(Array_iterator const& rhs) { if(m_pArray != rhs.m_pArray) { return -1; } return rhs.m_index - m_index; } bool equal(Array_iterator const& rhs) const { return m_pArray == rhs.m_pArray && m_index == rhs.m_index; } item_proxy dereference() const { return item_proxy(*this); } Array *m_pArray; int m_index; };//class Array_iterator Array_iterator array_begin(Array& array) { return Array_iterator(array); } Array_iterator array_end(Array& array) { return Array_iterator(array, ARRAY_SIZE); } int value_generator() { static int i = 0; return ++i; } int _tmain(int argc, _TCHAR* argv[]) { Array a; generate(array_begin(a), array_end(a), value_generator); // ERROR! copy(array_begin(a), array_end(a), ostream_iterator<int>(cout, " ")); return 0; } ------------------------------------------------------------------------

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RE: [Boost-users] Copyright notice in redistributed object files
by Jim.Hyslop 21 May '04

21 May '04

First: I am not a lawyer. If you want competent legal advice, consult a lawyer. What follows is my lay opinion, which may or may not be correct or valid in your legal jurisdiction. Aaron W. LaFramboise wrote: > I understand that the license states that I allowed to "use, > reproduce, display, distribute, execute, and transmit" Boost software > without restriction, provided that the software is in object form. > However, I still have a question about other responsibilities I might > have in redistributing a work of mine that incorporates Boost in > object form. In particular, I am interested in whether I have to > mention "Boost" or the authors' names at all anywhere in my software > or the supporting documentation. My opinion: If the license doesn't require it, you don't have to do it. If the license doesn't forbid it, then you can do it. Whatever "it" means in the appropriate context. > As an example, in distributed object code without source, do I need to > state a copyright notice including the Boost copyright holder's names > in the same place I put my ordinary copyright, if any? If my > derivative work is (other than Boost) released into the public domain > (for example, I explicitly disclaim all copyright interest), do I > still need to mention that Boost copyright holders have copyrighted > portions of the object code? You cannot place into public domain rights to something that you do not own. Since you do not own the rights to the Boost library, you cannot place it in the public domain. Your statement placing the code in the public domain should probably explicitly state _which_ code you are giving away. If your code is derived from Boost, i.e. you have taken the Boost code and modified it, then I think whether or not you can put it in the public domain will depend on the extent of your modifications. > Also, am I required to mention that the Boost portions of the > distributed objects have no warranty? For example, if I include > boost_regex.dll, am I required to state that that Boost copyright > holders provide no warranty? Hmmm... that's a trickier one. This one you might want to consult a lawyer about, because it gets into areas such as liability, consumer protection laws, etc. which vary from jurisdiction to jurisdiction. > Outside of my obligations under the Boost license, is there any other > particular reason I might acknowledge Boost or display their > copyright? Goodwill? > (I am asking this because several popular proprietary programs seem to > attempt to include a copyright notice for every rights-holder's code > included in their software, even where the licenses covering the code > does not seem to obligate the program distributor to include them.) <rant> I've seen this, and I don't agree with it. Consider what would happen if the automobile industry started doing this kind of thing. Your owner's manual would swell to several thousand pages long, with most of it being acknowledgements: Portions of this automobile were manufactured by Bolts-R-Us Inc. Portions of this automobile were assembled using Very Tough Tools(TM). blah blah blah. When you get down to it, end users don't care what makes up the program, as long as it works. For _their_ definition of "works". </rant> -- Jim Hyslop Senior Software Designer Leitch Technology International Inc. (http://www.leitch.com) Columnist, C/C++ Users Journal (http://www.cuj.com/experts)

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Copyright notice in redistributed object files
by Aaron W. LaFramboise 21 May '04

21 May '04

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, While legal issues are being discussed, I'd like to pose a question I myself have. I understand that the license states that I allowed to "use, reproduce, display, distribute, execute, and transmit" Boost software without restriction, provided that the software is in object form. However, I still have a question about other responsibilities I might have in redistributing a work of mine that incorporates Boost in object form. In particular, I am interested in whether I have to mention "Boost" or the authors' names at all anywhere in my software or the supporting documentation. As an example, in distributed object code without source, do I need to state a copyright notice including the Boost copyright holder's names in the same place I put my ordinary copyright, if any? If my derivative work is (other than Boost) released into the public domain (for example, I explicitly disclaim all copyright interest), do I still need to mention that Boost copyright holders have copyrighted portions of the object code? Also, am I required to mention that the Boost portions of the distributed objects have no warranty? For example, if I include boost_regex.dll, am I required to state that that Boost copyright holders provide no warranty? Outside of my obligations under the Boost license, is there any other particular reason I might acknowledge Boost or display their copyright? (I am asking this because several popular proprietary programs seem to attempt to include a copyright notice for every rights-holder's code included in their software, even where the licenses covering the code does not seem to obligate the program distributor to include them.) Thank you for your time, Aaron W. LaFramboise -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFAra7rlp/lhnWsM8QRAhQaAJ9favUFNvAOtWk6CcS5tOFSliOxSgCeLAHL zqhwCA9oXt7juuQeorADvFk= =sQDM -----END PGP SIGNATURE-----

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Regex++ Installation Problems
by kinshuk srivastava 20 May '04

20 May '04

Hi I am a Newbie to using the regex++.I am trying to install the regex++ library on a Linux system. according to the instructions given but I found the following errors: make -fgcc.mak mkdir -p gcc mkdir -p gcc/boost_regex g++ -o gcc/boost_regex/c_regex_traits.o -c -O2 -I../../../ ../src/c_regex_traits.cpp g++ -o gcc/boost_regex/c_regex_traits_common.o -c -O2 -I../../../ ../src/c_regex_traits_common.cpp g++ -o gcc/boost_regex/cpp_regex_traits.o -c -O2 -I../../../ ../src/cpp_regex_traits.cpp g++ -o gcc/boost_regex/cregex.o -c -O2 -I../../../ ../src/cregex.cpp ../../../boost/regex/v3/regex_match.hpp: In member function `unsigned int boost::RegEx::GrepFiles(bool (*)(const char*, const boost::RegEx&), const char*, bool, unsigned int)': ../../../boost/regex/v3/regex_match.hpp:1937: Internal compiler error in expand_call, at calls.c:3049 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions. make: *** [gcc/boost_regex/cregex.o] Fehler 1 I cant quite figure out what the problem is. Some one please help... Thanx in advance... -Kinshuk ________________________________________________________________________ Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/

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A simple question involving boost.function and boost.lambda
by gredner＠bu.edu 19 May '04

19 May '04

Greetings, I would like to crate a lambda expression that simply executes two functions sequentially. I have: using namespace boost; using namespace boost::lambda; function0<void> func1 = cout << constant('1'); function0<void> func2 = cout << constant('2'); I have tried: function0<void> funcs = (func1, func2); but this seems to execute only one of the two functions when it is called. I have also tried: function0<void> funcs = (_1(), _2())(func1, func2); but my compiler (GCC 3.3 under darwin) barfs it up, with error messages: ---------- main.cpp: In function `int main(int, char**)': main.cpp:58: error: no match for call to `(boost::tuples::null_type) ( boost::function0<void, std::allocator<boost::function_base> >&, boost::function0<void, std::allocator<boost::function_base> >&)' /usr/local/include/boost-1_31/boost/lambda/detail/lambda_functors.hpp: In member function `RET boost::lambda::placeholder<1>::call(A&, B&, C&, Env&) const [with RET = boost::tuples::null_type, A = const boost::tuples::null_type, B = const boost::tuples::null_type, C = const boost::tuples::null_type, Env = const boost::tuples::null_type]': /usr/local/include/boost-1_31/boost/lambda/detail/lambda_functors.hpp:143: instantiated from `typename T::sig<boost::tuples::null_type>::type boost::lambda::lambda_functor<Base>::operator()() const [with T = boost::lambda::placeholder<1>]' main.cpp:58: instantiated from here /usr/local/include/boost-1_31/boost/lambda/detail/lambda_functors.hpp:65: error: invalid application of `sizeof' to an incomplete type ---------- (line 58 is the assignment to funcs) I'd appreciate any advice :) -Gabe Redner

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How to compile minimal_test.cpp with gcc?
by Sebastian Stein 14 May '04

14 May '04

Hi, I downloaded boost-1.31.0 and the bjam package. I first compiled bjam and copied the executeables to /usr/local/bin. Then I went on to boost-1.31.0 (patched with the regex files). I first changed the env variables for python and compiled and installed the package with: bjam "-sTOOLS=gcc" install After building was finished, the files where copied. The include files got installed under /usr/local/include/boost-1_31/boost. I made a symlink /usr/local/include/boost pointing to /usr/local/include/boost-1_31/boost. Now I tried to do a small test, taken from: http://www.boost.org/libs/test/test/minimal_test.cpp I tried to compile the file with: gcc -o test minimal_test.cpp But I get a lot of error messages saying: In file included from test.cpp:16: /usr/local/include/boost/test/minimal.hpp:44:47: libs/test/src/execution_monitor.cpp: No such file or directory In file included from test.cpp:16: /usr/local/include/boost/test/minimal.hpp:62: error: `execution_monitor' is not a class or namespace /usr/local/include/boost/test/minimal.hpp:62: error: invalid base-class specification /usr/local/include/boost/test/minimal.hpp:63: error: parse error before `::' token /usr/local/include/boost/test/minimal.hpp:75: error: type specifier omitted for parameter `c_string_literal' /usr/local/include/boost/test/minimal.hpp:75: error: parse error before `,' token /usr/local/include/boost/test/minimal.hpp:91: error: type specifier omitted for parameter `c_string_literal' /usr/local/include/boost/test/minimal.hpp:91: error: parse error before `,' token /usr/local/include/boost/test/minimal.hpp:98: error: parse error before `,' token /usr/local/include/boost/test/minimal.hpp:98: error: parse error before `,' token /usr/local/include/boost/test/minimal.hpp:98: error: missing ';' before right brace /usr/local/include/boost/test/minimal.hpp:98: error: semicolon missing after declaration of `boost::minimal_test::monitor' ... ... ... /usr/local/include/boost/test/minimal.hpp:130: error: parse error before `if' /usr/local/include/boost/test/minimal.hpp:138: error: syntax error before `<<' token test.cpp: In function `int test_main(int, char**)': test.cpp:54: error: `the_monitor' undeclared in namespace `boost::minimal_test' test.cpp:55: error: `the_monitor' undeclared in namespace `boost::minimal_test' test.cpp:57: error: `the_monitor' undeclared in namespace `boost::minimal_test' test.cpp:58: error: `the_monitor' undeclared in namespace `boost::minimal_test' test.cpp:60: error: `the_monitor' undeclared in namespace `boost::minimal_test' test.cpp:61: error: `the_monitor' undeclared in namespace `boost::minimal_test' test.cpp:63: error: `the_monitor' undeclared in namespace `boost::minimal_test' test.cpp:64: error: `the_monitor' undeclared in namespace `boost::minimal_test' test.cpp:66: error: `the_monitor' undeclared in namespace `boost::minimal_test' test.cpp:68: error: `the_monitor' undeclared in namespace `boost::minimal_test' Well, mostly interesting is the first line: /usr/local/include/boost/test/minimal.hpp:44:47: libs/test/src/execution_monitor.cpp: No such file or directory Why is a part of the source included here? Is there a special place where the source should be installed, so that it can be found? I also tried replacing the include statement pointing to the execution_monitor.hpp header file in the include directory, but this produced far more error messages. So how do I build this small test program under gcc 3.3 (Linux)??? Is there somewhere a good step by step guide (tutorial) how to use boost and how to set up the build environment for small projects? Sebastian -- ONE FAMILY! Leipzig 2012 - Olympic Summer Games http://www.leipzig2012.com/

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RE: [Boost-users] Shared_Ptr problem with 1.30.2 and gcc 3.2.3
by Ben Hutchings 14 May '04

14 May '04

Joshua Little <ljoshua(a)swbell.net> wrote: > I've been using shared_ptr's for a while now with gcc 3.1 and > recently had to upgrade to gcc 3.2.3. Ever since then I'm getting > strange crashes when shared_ptr's are destructed. Heres a backtrace : > Program received signal SIGSEGV, Segmentation fault. <snip> Did you rebuild everything with the new release? There may be some difference in the ABIs used by the two releases though they are supposed to be compatible (3.2.1 is different on Cygwin though; that was a bug).

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Python.exe crashes with C++ interfaces exported to python using boost
by mayankg＠iiitb.ac.in 14 May '04

14 May '04

Hi, I have developed a dll, in that I have exported the C++ interfaces as python interfaces using boost. While running the python script, which uses those interfaces, I am facing a strange problem. When I try to call the del operator on the object of a particular class in the python script, whose interfaces has been exported to python, the python.exe crashes and gives me the following error: _BLOCK_TYPE_IS_VALID(pHead->nBlockUse) When I try to debug my dll, it is crashing inside the destructor of the class, where a byte pointer is being deleted. Although the delete operator on the same type of object works fine when i try to do the same kind of operation from a sample C++ application using my dll. I have checked the project properties etc. and my dll uses Debug Multithreaded DLL and Multithreaded DLL, for the runtime library, for debug and release builds. I have also tried with both debug and release dlls. Please help, Thanks, Mayank

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Sun C++ 5.5 and std::numeric_limits
by Robin KAY 14 May '04

14 May '04

As of patch 113817-04 to the Sun C++ 5.5 compiler (see http://sunsolve6.sun.com/search/document.do?assetkey=1-21-113817 ), the functions in the numeric_limits class support 64 bit integers. However, the logic in boost/boost/config/stdlib/roguewave.hpp doesn't detect this a defines BOOST_NO_LONG_LONG_NUMERIC_LIMITS and hence causes an error: "../../../../boost/boost/limits.hpp", line 35: Error: Multiple declaration for std::numeric_limits<long long>. "../../../../boost/boost/limits.hpp", line 88: Error: Multiple declaration for std::numeric_limits<unsigned long long>. 2 Error(s) detected. As __SUNPRO_CC is set to 0x550 for both compilers below and above patchlevel 04, I can't see a way to fix this without extending the logic in the CVS head, for handling Sun C++ 5.6, to 5.5 and breaking unpatched installations. -- Wishing you good fortune, --Robin Kay-- (komadori)

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