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[Review] Boost.Type Traits Extension by Frederic Bron
by Joel Falcou 09 Mar '11

09 Mar '11

Dear All, According to the Boost Formal Review Schedule [1], fast track review of Frédéric Bron's extensions to the Type Traits Library starts on March 14th and lasts until March 18th, 2011 under my management. [1]http://www.boost.org/community/review_schedule.html =========== What is it? =========== This extension adds 37 new traits corresponding to the following 37 operators: - binary: ==, !=,<,<=,>,>=, , +, -, *, /, %, +=, -=, *=, /=, %=, , &&, ||, ,&, |, ^,<<,>>,&=, |=, ^=,<<=,>>= - prefix: ++, --, +, -, !, ~, * - postfix: ++, -- Each trait can detect if the operator can be used with particular types and if needed, if the return type is convertible to some type. =================== Getting the library =================== The latest version can be downloaded by different ways: - from the vault with unix line ending: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=type_t… - from the vault with dos line ending: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=type_t… - from the sandbox:http://svn.boost.org/svn/boost/sandbox/type_traits/ The entry point of the documentation is type_traits/libs/type_traits/doc/html/boost_typetraits/category/value_traits/operators.html The library has been tested with: - MSVC 8, 9, 10 on Windows, - g++ 4.4.5 on Linux, - intel 10.0 and 11.1 on Linux. To test the library, the simplest is to untar the headers in your boost include directory. For this, you can download the header part of the extension: - from the vault with unix line ending: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=type_t… - from the vault with dos line ending: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=type_t…

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Review Results for Proposed Boost.Process library
by Marshall Clow 08 Mar '11

08 Mar '11

---------------------------- Executive Summary ---------------------------- Boris Schäling's Process library was reviewed from February 7th, 2011 through February 20, 2011. The library sparked a lively debate on the mailing list, and in the end, eight reviews were submitted: - 1 review ACCEPT - 2 reviews CONDITIONALLY ACCEPT - 5 review DO NOT ACCEPT Since there was not a clear view in either the discussion or the votes that this library should be accepted: The Process library IS NOT ACCEPTED into Boost. There was considerable disagreement both about the scope of the library (what features to provide) and how the features were implemented. More than one alternate design was proposed, and the advantages and disadvantages of various approaches (where to install signal handlers, having a single thread vs. one thread/child) were debated vigorously. However, there was a fairly broad consensus that the library, in its present state, was not ready to be included into Boost. Thank you to everyone who participated, and especially to Boris and those who wrote a review. I would like to encourage Boris to continue development of his library and to resubmit it for review at a future date. ---------------------------- Concerns voiced by reviewers (a partial list) ---------------------------- * There was considerable push back by the reviewers about the cross-platform interface; specifically the use of #ifdefs * Artyom pointed out the possibility of deadlock given the current implementation, and a lack of wide-character support on Windows. * Oliver said "I'm missing the possibility to send signals to a process and to wait for a process to be stopped (SIGSTOP) or resumed (SIGCONT) using boost.asio." * There was a lot of discussion about the correct way to handle SIGCHILD, and how to implement passing data back and forth between the parent and child processes. * There was an involved many-sided discussion on about what facilities a Boost.Process library should provide. * More than one person proposed an alternate interface for the library (Jeff Flinn, Darren Garvey, Max Sobolev, possibly more) * Brendon Costa expressed concerns that it would be easy to end up with zombie processes using the current library. * Jeremy Maitin-Shepard felt that "The lack of efficient asynchronous waiting support, and the overly complicated stream behavior interface, are show-stoppers for me". * Jeff Flinn did not like the lack of launch error reporting (among other things) -- Marshall Clow; Review Manager

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[graph] Is reverse_graph<> read-only?
by al.zatv 08 Mar '11

08 Mar '11

Hello! Is reverse_graph<> in Boost::Graph Library, read-only? I just can't beleive it:) Can it be fixed?

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FW: compiling parallel boost graph lib
by Xin Sui 08 Mar '11

08 Mar '11

Hi: When I compile parallel boost graph library, I encounter the following errors: parallel-bgl-0.7.0/boost/graph/distributed/adjlist/serialization.hpp: In function `std::vector<int, std::allocator<int> > boost::detail::parallel::available_process_files(const std::string&)': parallel-bgl-0.7.0/boost/graph/distributed/adjlist/serialization.hpp:97: error: conversion from `boost::filesystem3::path' to non-scalar type `std::basic_string<char, std::char_traits<char>, std::allocator<char> >' requested make[2]: *** [libs/graph_parallel/test/CMakeFiles/adjlist_build_test.dir/adjlist_build_test.cpp.o] Error 1 make[1]: *** [libs/graph_parallel/test/CMakeFiles/adjlist_build_test.dir/all] Error 2 The CMake found the following software: gcc (GCC) 3.4.6, Boost version: 1.46.0 and openmpi 1.3, c++ (GCC) 3.4.6 20060404 (Red Hat 3.4.6-11) Do you guys have an idea what the problem is? Thanks Xin

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Boost Interprocess error on Solaris sun studio 12
by aidan mcgurn 08 Mar '11

08 Mar '11

Hi, Currently my company are having issues compiling Boost Interprocess 1.42 on Solaris sun Studio. I see from Boost documentation that this compiler is not listed as having been used to build Interprocess: i.e. * Visual 7.1 Windows XP * Visual 8.0 Windows XP * GCC 4.1.1 MinGW * GCC 3.4.4 Cygwin * Intel 9.1 Windows XP * GCC 4.1.2 Linux * GCC 3.4.3 Solaris 11 * GCC 4.0 MacOs 10.4.1 I have also seen from this next thread that there is a bug logged against this issue as posted from someone with a similar issue: http://forums.oracle.com/forums/thread.jspa?threadID=1992480&tstart=45 "Unfortunately, your problem is one of the outstanding issues with Boost that we have not yet resolved. This one is bug number 6954828, generated internally, and not visible at bugs.sun.com. Fixing bugs that prevent Boost from compiling is a priority item for us, but I can't predict when a fix for this problem will be available." This was posted a year ago so i am wondering has this been fixed in recent Boost editions or plans to? If not is there a recommended workaround? (outside the posts suggested flag changes "-D_POSIX_C_SOURCE=4 -D_XPG4 -D_XPG4_2" which are unpredictable to other parts of our system) thanks for any suggestions, /aidan ======= Errors i see: "/spare/integra/thirdparty/include/boost/interprocess/mapped_region.hpp", line 549: Error: Formal argument 1 of type char* in call to shmdt(char*) is being passed void*. "/spare/integra/thirdparty/include/boost/interprocess/shared_memory_object.hpp", line 284: Error: The function "shm_open" must have a prototype. "/spare/integra/thirdparty/include/boost/interprocess/shared_memory_object.hpp", line 307: Error: The function "shm_unlink" must have a prototype.

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[Regex] Search Substring
by S Nagre 08 Mar '11

08 Mar '11

Hi, I am new to boost Libraries and I am trying to find a substring using Boost::Regex Lets say I want to find string "Hello" in "Hello world". std::string completeStr = "Hello World"; std::string::const_iterator startOffset = completeStr.begin(); std::string::const_iterator endOffset = completeStr.end(); std::string searchWord= "Hello"; boost::regex expression(searchWord); boost::match_flag_type flags = boost::match_any; while(boost::regex_search(startOffset, endOffset, what, expression, flags)) { int32 position = what.position(1); int32 len = what[1].length(); } but value of this position and length value is coming out to be -1. It is not able to find this substring, Could anyone tell me what I am doing wrong ? Subhash

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multi_index_container insert is excruciatingly slow
by Georges Dupret 08 Mar '11

08 Mar '11

Hi! In spite of compiling with NDEBUG set: g++ -Wall -D_REENTRANT -msse2 -mfpmath=sse -Wno-deprecated -DNDEBUG -c -O3 -I/home/gdupret/.local/lib64/include/ -MMD -MP -MF build/Release/GNU-Linux-x86/Model.o.d -o build/Release/GNU-Linux-x86/Model.o Model.cpp, inserting into a multi_index_container is excruciatingly slow. I have a large nbr. of elements to insert (10^5) but even the first 1000 are very slow. I also set: #ifndef NDEBUG #define NDEBUG #endif #ifdef BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING #undef BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING #endif #ifdef BOOST_MULTI_INDEX_ENABLE_SAFE_MODE #undef BOOST_MULTI_INDEX_ENABLE_SAFE_MODE #endif in the header calling the multi_index_container, but I see no change. Any suggestion on how I should do? Best ge

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[uBLAS] Results of different size matrix addition
by Ryan 08 Mar '11

08 Mar '11

According to the preconditions for binary matrix operations both matrix must have the same size ( http://www.boost.org/doc/libs/1_46_0/libs/numeric/ublas/doc/matrix_expressi…) What runtime error should I expected if the matrix sizes are not the same? Ryan

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[ICL] More compilation questions/problems
by John Reid 08 Mar '11

08 Mar '11

#include <boost/icl/interval.hpp> template< typename IntervalT > void check_contains() { IntervalT interval; typedef typename IntervalT::domain_type domain_t; ::boost::icl::contains( interval, domain_t() ); } void h() { namespace icl = ::boost::icl; check_contains< icl::continuous_interval< float > >(); check_contains< icl::discrete_interval< int > >(); check_contains< icl::right_open_interval< float > >(); check_contains< icl::left_open_interval< float > >(); check_contains< icl::closed_interval< float > >(); check_contains< icl::open_interval< float > >(); } The last 2 lines in h() do not compile whilst the preceeding 4 do. Is this by design or a bug? Testing elements for membership of a closed or open interval seems natural enough. I'm using gcc 4.4.3. Thanks, John.

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[general] is there a noop deallocator in boost?
by Mostafa 07 Mar '11

07 Mar '11

Hi all, I'm interested in a noop deallocator for use in shared_ptr, but can't find one in boost, so does anyone know of one? (I know it's trivial to write one, but that doesn't out weight the convenience of using a standardized one.) Thanks, Mostafa

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