- Boost-users - lists.preview.boost.org

BGL::johnson_all_pairs_shortest_path question
by Andreas Fabri 28 Apr '05

28 Apr '05

Hello, What is the non-named parameter version of this algorithm. In the online manual it says Weight (and this is probably a typo, as there is a template parameter WeightMap). Also what are the arguments id1 and zero good for? andreas

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[BGL] check edge existence in adjacency_matrix in constant time?
by Felipe Magno de Almeida 28 Apr '05

28 Apr '05

Sorry if I have overlooked something in the docs, but Im really not finding it... Is there someway to check the existence of an edge in adjacency_matrix in constant time knowing its vertices? An explanation or a pointer to the right place in the docs would be really appreciated. Thanks in advance, -- Felipe Magno de Almeida UIN: 2113442 email: felipe.almeida at ic unicamp br, felipe.m.almeida at gmail com, felipe at synergy com I am a C, modern C++, MFC, ODBC, Windows Services, … [View More]

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Re: [Boost-users] Compatibility between shared_ptr and Rational RoseRT
by Dave.Ware＠seleniacomms.com 28 Apr '05

28 Apr '05

Don't worry about having hijacked my original thread. The examples you've been discussing have been very helpful to my code as well. We haven't solved all of our problems yet, but it is much better. Thanks ------------------------------------------------------------ This email and any attached files contains company confidential information which may be legally privileged. It is intended only for the person(s) or entity to which it is addressed and solely for the purposes set forth … [View More]

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Function pointers, result_of<> and function_traits<>
by Delfin Rojas 27 Apr '05

27 Apr '05

Hello all, I am trying to get the return type of a member function given its signature. Consider the following example from the boost result_of test: struct X {}; int main { using namespace boost; typedef int (X::*mem_func_ptr)(float); BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr(X,char)>::type, int>::value)); } This test compiles/runs with no problems. Now, what I want is the return type of a function with signature "int (X::*)()" I added the following to the … [View More]

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const-correctness and lambda expression
by Matthias Kaeppler 27 Apr '05

27 Apr '05

Hi, in my program, I have this function to compute the sum of sizes of a bunch of files: Glib::ustring DirBrowser::get_total_file_size() { using namespace boostfs; // boostfs = boost::filesystem using namespace lambda; // lambda = boost::lambda boost::intmax_t sum = 0; std::for_each(m_first_file,m_files.end(),sum+=bind(&file_size,*_1)); return make_size_human_readable( sum ); } The line with for_each computes the sum of file sizes, by iterating over a … [View More]

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RE: [Boost-users] Problems with boost::filesystem::path continued
by Johnson, Donald W MVK Contractor 27 Apr '05

27 Apr '05

It seem that due to sheer luck mixing the runtimes was not causing problems. Objects allocated in the dll where always deleted in the dll and objects allocated in the application likewise deallocated in the application. I know because I had forced things to work using BOOST_FILESYSTEM_NO_LIB and manually linking to the library, and the application worked and all the tests ran fine. The application was linked to /MT or /MTd so that was a disaster waiting to happen the first time I called a … [View More]

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minimal perfect hash
by Davi de Castro Reis 27 Apr '05

27 Apr '05

Hi all, I recently found in the archives a discussion about minimal perfect hashing in boost, in the beginning of January (2005). Does someone one have any news about it? I have written myself a F/OSS C library for minimal perfect hashing, and I am willing to contribute for any efforts to make this data structure part of the boost toolkit. Thanks in advance, Davi

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Re: Placeholder Arguments
by Joe McCay 27 Apr '05

27 Apr '05

David Abrahams <dave(a)boost-consulting.com> writes: > Are you asking about runtime lambda expressions as in the Boost Lambda > library, or compile-time lambda expressions as in MPL? > > -- > Dave Abrahams > Boost Consulting > www.boost-consulting.com I was talking about MPL because that is the only one I have studied at the moment. What is the difference between the two outside of the obvious runtime/compile-time difference? I was trying to figure out how a … [View More]

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Re: Boost Logging Library?
by Jwahar Bammi 27 Apr '05

27 Apr '05

I dont understand the need for the "Proposed Boost logging library". A perfectly good and flexible logging library exists in the form of log4cxx, which is much more flexible than the proposal, has a ton of tools, appenders, is compatible with log4j/log4net etc etc (for those of us who live in multiple worlds). log4cxx is going through a almost complete rewrite, but is still eminently usable. see http://logging.apache.org/log4cxx/ cheers, > > >Vladimir Prus wrote: > > &… [View More]

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Problems with boost::filesystem::path continued
by Johnson, Donald W MVK Contractor 27 Apr '05

27 Apr '05

I found the main problem, I had edited the wrong boost/config/user.hpp file. When I set BOOST_FILESYSTEM_DYN_LINK in the correct user.hpp file I get this error. c:\Boost\include\boost-1_31\boost\config\auto_link.hpp(269): fatal error C1189: #error : "Mixing a dll boost library with a static runtime is a really bad idea..." #if (defined(_DLL) || defined(_RTLDLL)) && defined(BOOST_DYN_LINK) # define BOOST_LIB_PREFIX #elif defined(BOOST_DYN_LINK) # error "Mixing a dll boost library … [View More]

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