December 2010 - Boost-users

[statechart] optional<event> - warning
by Igor R 07 Dec '10

07 Dec '10

Hello, When I define optional<my_event>, I get a warning (MSVC10): warning C4291: 'void *boost::statechart::event<MostDerived>::operator new(size_t,void *)' : no matching operator delete found; memory will not be freed if initialization throws an exception In class statechart::event I see 2 overloads of operator new: void * operator new( std::size_t size ) void * operator new( std::size_t, void * p ) But only 1 operator delete: void operator delete( void * pEvent ) i.e., no placement delete. Is this intentional? Thanks.

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Object pool
by Lloyd 07 Dec '10

07 Dec '10

Hi, I have gone through the object pool documentation, but could not find a clear answer to my doubt. I want to make a pool of 10 objects. As and when an object need to be created, the pool will be searched for free objects, then the free ones will be chosen. Otherwise it will wait until any of the object is free. Is this possible with object pool? My questions are... How can I allocate 10 objects in single shot? How can I get the reference to unused object from the pool? Is there a same mechanism for threads as well? Thanks in advance, Lloyd

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Boost 1.39.0 program options.
by Sunil Thomas 07 Dec '10

07 Dec '10

Hi, Has any one else had a *glibc error (invalid free/delete issue)* pointing to boost_program-options in boost 1.39.0? Program exits with glibc error (double free; although nothing obvious stands out). Running valgrind hasn't really helped a lot. Is this a known boost issue in 1.39.0? I am using non-multithreaded versions of the boost libs: program-options, regex, iostreams, python, filesystem, system, date_time, unit_test_framework, and multithreaded version only for boost lib: thread. I've reached my wit's end on this problem that occurs only on linux (red hat 5, GNU compilers, GCC version 4.1.2) and any advice is helpful. Greatly appreciate if you could share your experience on how you fixed it. Thanks! --Tom.

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Building boost on AIX6.
by Pat Suwalski 06 Dec '10

06 Dec '10

Hello, I'm having a lot of difficulty building boost on AIX6 with gcc. Searching for my problem just came up with a bunch of Windows users not settings their variables correctly. That does not seem to be the case for me. I'm dealing with v1.34.1, because apparently that works well on AIX. I had no problem building bjam. But then: -bash-3.2$ pwd /home/pats/boost-1.34.1 -bash-3.2$ ./tools/jam/src/bin.aix/bjam Unable to load Boost.Build: could not find build system. --------------------------------------------------------- /home/pats/boost-1.34.1/boost-build.jam attempted to load the build system by invoking 'boost-build tools/build/v2 ;' but we were unable to find "bootstrap.jam" in the specified directory or in BOOST_BUILD_PATH (searching /usr/share/boost-build, /home/pats/boost-1.34.1/tools/build/v2). Please consult the documentation at 'http://www.boost.org'. -bash-3.2$ ls -la /home/pats/boost-1.34.1/tools/build/v2/bootstrap.jam -rw-r--r-- 1 pats staff 761 Oct 29 2003 /home/pats/boost-1.34.1/tools/build/v2/bootstrap.jam Clearly the file is there. Setting explicit $BOOST_BUILD_ROOT and $BOOST_ROOT changes nothing, other than the error message output not mentioning /usr/share. So, the error message is lying, or there is something less obvious wrong. I had no issues building the same source tree on Suse and Solaris. Any advice? Many thanks, --Pat

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Fwd: building Regex for Builder C++ 6.0
by Aleksandr Razov 06 Dec '10

06 Dec '10

Hello, I have a problem with building Regex for Builder C++ 6.0 When I execute make -fbcb6.mak I get following errors MAKE Version 5.2 Copyright (c) 1987, 2000 Borland bcc32 @MAKE0000.@@@ Borland C++ 5.6 for Win32 Copyright (c) 1993, 2002 Borland ../src/c_regex_traits.cpp: bcc32 @MAKE0001.@@@ Borland C++ 5.6 for Win32 Copyright (c) 1993, 2002 Borland ../src/cpp_regex_traits.cpp: bcc32 @MAKE0002.@@@ Borland C++ 5.6 for Win32 Copyright (c) 1993, 2002 Borland ../src/cregex.cpp: Error E2316 ../../../boost/functional/hash/hash.hpp 64: 'long_long_type' is > not a member of 'boost' Error E2356 ../../../boost/functional/hash/hash.hpp 64: Type mismatch in > redecla ration of 'boost::hash_value(bool)' Error E2344 ../../../boost/functional/hash/hash.hpp 48: Earlier declaration > of ' boost::hash_value(bool)' Error E2063 ../../../boost/functional/hash/hash.hpp 64: Illegal > initialization Error E2293 ../../../boost/functional/hash/hash.hpp 64: ) expected Error E2316 ../../../boost/functional/hash/hash.hpp 65: 'ulong_long_type' is > not a member of 'boost' Error E2238 ../../../boost/functional/hash/hash.hpp 65: Multiple declaration > for 'boost::hash_value(bool)' Error E2344 ../../../boost/functional/hash/hash.hpp 64: Earlier declaration > of ' boost::hash_value(bool)' Error E2063 ../../../boost/functional/hash/hash.hpp 65: Illegal > initialization Error E2293 ../../../boost/functional/hash/hash.hpp 65: ) expected Error E2171 ../../../boost/functional/hash/hash.hpp 137: Body has already > been d efined for function 'boost::hash_value(bool)' Error E2451 ../../../boost/functional/hash/hash.hpp 138: Undefined symbol > 'v' in function boost::hash_value(bool) Error E2316 ../../../boost/functional/hash/hash.hpp 194: 'long_long_type' is > not a member of 'boost' Error E2092 ../../../boost/functional/hash/hash.hpp 194: Storage class > 'inline' is not allowed here Error E2445 ../../../boost/functional/hash/hash.hpp 194: Variable > 'hash_value' i s initialized more than once Error E2063 ../../../boost/functional/hash/hash.hpp 194: Illegal > initialization Error E2293 ../../../boost/functional/hash/hash.hpp 194: ) expected Error E2316 ../../../boost/functional/hash/hash.hpp 434: 'long_long_type' is > not a member of 'boost' Error E2299 ../../../boost/functional/hash/hash.hpp 434: Cannot generate > templat e specialization from 'hash<T>' Error E2428 ../../../boost/functional/hash/hash.hpp 434: Templates must be > class es or functions Error E2316 ../../../boost/functional/hash/hash.hpp 435: 'ulong_long_type' > is no t a member of 'boost' Error E2299 ../../../boost/functional/hash/hash.hpp 435: Cannot generate > templat e specialization from 'hash<T>' Error E2428 ../../../boost/functional/hash/hash.hpp 435: Templates must be > class es or functions *** 23 errors in Compile *** > ** error 1 ** deleting bcb\libboost_regex-bcb-s-1_45\cregex.obj Please. Could anybody help me to resolve the problem. Thank you in advance. Aleksandr

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compile time (template or preprocessor) text processing
by Laszlo Marak 06 Dec '10

06 Dec '10

Hello, My question is c++ related (I like to call the topic extreme c++ programming). We all know the excellent boost python framework, which exports c++ functions to python with spectacular elegance. As for the documentation of those functions boost offers a string parameter, which can contain the description of the particular function. Sometimes this documentation is already written (for example in doxygen). It would be good to import this documentation somehow to python. Is there a possibility to generate a std::string from a FILE following some rules using template meta-programming (or possibly the preprocessor)? For example my_function.cpp ///************* // this is the documentation of my_function // void my_function() { cout << "I've been called.\n" } boost_export.cpp def( "my_function", &my_function, (args()), generate_the_doc_in_compile_time_from<>("my_function.cpp") ) Here the generate_the_doc_in_compile_time_from<>("my_function.cpp") would hard-wire the docs into def at compile time, so it would no longer depend on my_function.cpp. Any ideas would be greatly appreciated. UJ

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Lookup on composite key in MultiIndex
by Chris Jewell 06 Dec '10

06 Dec '10

Hi All, A question about fast lookup on ordered indices, if I may. I have a data structure: struct Individual { double I; double N; ... } I need some way of indexing Individuals such that I can perform queries such as "Return the set of Individuals such that Individual::I < T and Individual::N > N". I'm currently using a MultiIndex that orders the individuals by Individual::I, and therefore gives me fast lookups on the I field. I had thought about creating a composite key on both I and N, and then using the range() method to return iterators to the required individuals. However, I can't seem to find the correct syntax for a predicate for the composite key. Can anyone help me out? Is there a better way to achieve what I need? Thanks, Chris -- Dr Chris Jewell Department of Statistics University of Warwick Coventry CV4 7AL UK Tel: +44 (0)24 7615 0778

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counting_range and irange
by Mathias Gaunard 06 Dec '10

06 Dec '10

What is the difference between counting_range and irange?

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[Quickbook 1.4] template for link to issue ?
by Martin Moene 06 Dec '10

06 Dec '10

Hi, Still using Quickbook 1.4, I've not been able to create a template for linking to items in our issue database. Writing out the following works: \[[@https://host.domain/issues/view.php?id=121 #121]\] Text.. Giving: [#121] Text... I tried (several variations of) a macro like: [template issue[key] [@https://host.domain/issues/view.php?id=[key] #[key]] ] Using: * \[[issue 121]\] Text... However none had the desired effect. (I prefer to include the \[, \] inside the template.) Should I write the template differently, or do I have to upgrade to a newer version of Quickbook? Can someone give a hint? Thanks in advance. Martin Moene

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mpi: sending/receiving different types
by Hicham Mouline 06 Dec '10

06 Dec '10

Hi, I will be sending messages of different kinds. The destination will not know what kind of message it is trying to receive. Imagine I send many messages of the same kind. I understand the tag in send/receive will be different in each case? Or can I send 2 messages of the same king with the same tag? That way the receiver can use the tag to identify what it is it is receiving. If so, is the receiver supposed to use the recv() function with different template argument T until the call succeeds ? Or should I always use packed_<oi>archive? rds,

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