January 2013 - Boost-users - lists.preview.boost.org

boost::range vs && (rvalue ref)
by Neal Becker 11 Jan '13

11 Jan '13

Passing range by ref (&) is fine, but using (&&) results in and error. Any ideas? #include <boost/range.hpp> #include <vector> template<typename out_t> void F (out_t && o) { typedef typename boost::range_value<out_t>::type T; } void G() { std::vector<int> v; F (v); } usr/local/src/boost_1_52_0/boost/mpl/eval_if.hpp:60:31: error: no type named ‘type’ in ‘boost::mpl::eval_if_c<false, boost::range_const_iterator<std::vector<int>&>, boost::range_mutable_iterator<std::vector<int>&> >::f_ {aka struct boost::range_mutable_iterator<std::vector<int>&>}’ bug.cc: In instantiation of ‘void F(out_t&&) [with out_t = std::vector<int>&]’: bug.cc:12:7: required from here bug.cc:6:52: error: no type named ‘type’ in ‘struct boost::range_value<std::vector<int>&>’

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Re: [Boost-users] mixed 32bit and 64bit shared memory
by Dave Dyer 11 Jan '13

11 Jan '13

I see notes about boost supporting "customizing offset_ptr" to support shared memory where both 64 bit and 32 bit processes are sharing the memory, but I don't see a specific example of how to do that. It seems that "out of box" it doesn't work.

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Re: [Boost-users] mixed 32bit and 64bit shared memory
by Dave Dyer 11 Jan '13

11 Jan '13

I see notes about boost supporting "customizing offset_ptr" to support shared memory where both 64 bit and 32 bit processes are sharing the memory, but I don't see a specific example of how to do that. It seems that "out of box" it doesn't work.

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[1.53.0] Beta release candidates available
by Marshall Clow 10 Jan '13

10 Jan '13

Release candidate files for 1.53.0 beta 1 are available at http://boost.cowic.de/rc/ As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. The files (and associated md5s) are: d5a45d0e08a14d5fb0965fe675d76ac6 *boost_1_53_0_beta1_rc1.tar.gz 89a6084458cd9f0e136c4b5292265461 *boost_1_53_0_beta1_rc1.tar.bz2 2a8897e04c59ccaf39189568f6966d60 *boost_1_53_0_beta1_rc1.zip 4cdf5a71d46e1115ca0c413f5b139a54 *boost_1_53_0_beta1_rc1.7z Thanks, --The release managers

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build without python
by Philipp Kraus 10 Jan '13

10 Jan '13

Hello, I try to build Boost with MPI on a system and I get errors, because Boost try to build python also. I run b2 and I build with the --with option the following libraries Performing configuration checks - gcc visibility : yes - long double support : yes - has_icu builds : no Component configuration: - chrono : not building - context : not building - date_time : building - exception : building - filesystem : building - graph : not building - graph_parallel : not building - iostreams : building - locale : not building - math : building - mpi : building - program_options : building - python : not building - random : building - regex : building - serialization : building - signals : not building - system : building - test : not building - thread : building - timer : not building - wave : not building The b2 command is: --with-exception --with-math --with-system --with-iostreams --layout=system link=shared runtime-link=shared threading=multi variant=release install --prefix=../build_release/boost/1.52.0 --with-regex --with-random --with-thread --with-date_time --with-program_options --with-filesystem --with-mpi --with-serialization The build process breaks with the error eg: ...failed gcc.compile.c++ bin.v2/libs/python/build/gcc-4.6/release/threading-multi/long.o... gcc.compile.c++ bin.v2/libs/python/build/gcc-4.6/release/threading-multi/dict.o In file included from ./boost/python/detail/prefix.hpp:13:0, from ./boost/python/dict.hpp:8, from libs/python/src/dict.cpp:4: ./boost/python/detail/wrap_python.hpp:75:24: fatal error: patchlevel.h: No such file or directory compilation terminated. If I mix --with and --without option on the b2 command I get the error: error: both --with-<library> and --without-<library> specified How can I disable any Python builds? Thanks Phil

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build without python
by Philipp Kraus 10 Jan '13

10 Jan '13

Hello, I try to build Boost with MPI on a system and I get errors, because Boost try to build python also. I run b2 and I build with the --with option the following libraries Performing configuration checks - gcc visibility : yes - long double support : yes - has_icu builds : no Component configuration: - chrono : not building - context : not building - date_time : building - exception : building - filesystem : building - graph : not building - graph_parallel : not building - iostreams : building - locale : not building - math : building - mpi : building - program_options : building - python : not building - random : building - regex : building - serialization : building - signals : not building - system : building - test : not building - thread : building - timer : not building - wave : not building The b2 command is: --with-exception --with-math --with-system --with-iostreams --layout=system link=shared runtime-link=shared threading=multi variant=release install --prefix=../build_release/boost/1.52.0 --with-regex --with-random --with-thread --with-date_time --with-program_options --with-filesystem --with-mpi --with-serialization The build process breaks with the error eg: ...failed gcc.compile.c++ bin.v2/libs/python/build/gcc-4.6/release/threading-multi/long.o... gcc.compile.c++ bin.v2/libs/python/build/gcc-4.6/release/threading-multi/dict.o In file included from ./boost/python/detail/prefix.hpp:13:0, from ./boost/python/dict.hpp:8, from libs/python/src/dict.cpp:4: ./boost/python/detail/wrap_python.hpp:75:24: fatal error: patchlevel.h: No such file or directory compilation terminated. If I mix --with and --without option on the b2 command I get the error: error: both --with-<library> and --without-<library> specified How can I disable any Python builds? Thanks Phil

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Building boost with custom gcc/g++
by arjun 10 Jan '13

10 Jan '13

Hi, I have issues in getting boost to build with a custom gcc installation in a separate folder, with default gcc in /usr/bin/. Describing the problem, and issues I am facing below. I would love to have a foolproof and right way to do this. I hope I can get some help here. Building boost with a custom compiler : Problem : 1. I have gcc/g++ in /usr/bin, and I have gcc 4.7.2 in /shared/tools/rtf/bin/gcc & /shared/tools/rtf/bin/g++ 2. I want to compile boost libraries using gcc 4.7.2 ONLY. Solutions : 1. If I export PATH as /shared/tools/rtf/bin:$PATH, so that "which gcc" picks the 4.7.2 one, then I run ./bootstrap.sh and ./b2 install, is that a correct way to do it? 2. Alternatively, would I have to change some .jam files like user-config.jam to point out gcc with using gcc : gcc-4.4 : /shared/tools/... gcc and then compile using Boost.build? Is this the recommended way? Issues/Confusions : 1. If I try to build using Boost.build way I first go to the directory tools/build/v2. Now 1st step to bootstrap, how to bootstrap it with /shared/tools/...gcc compiler? The only way I saw for that was to do like CC=/shared/tools/..gcc ./bootstrap.sh --with-toolset=cc as this actually picks from CC environment variable. Is this correct? 2. The subsequent step ./b2 install --prefix=INSTALL_PATH to build Boost.build fails saying cc.jam not present. How to get that jam file to be present? Should that be created manually? 3. I had also changed user-config.jam to have gcc-4.7 (using gcc : 4.7 : /shared/tools/..gcc). CC=/shared/tools/..gcc ./bootstrap.sh --with-toolset=cc toolset=gcc-4.7 Is this used during bootstrap.sh step? Or only when we give the actual boost build (running b2) 4. Another issue was when I run the bootstrap.sh inside tools/build/v2 (to get Boost.build built), If I give a --with-toolset option, I get the b2 and bjam executables in the current directory. If I do not give a with-toolset option, it automatically defaults to cc, in which case the b2,bjam are inside engine/bin.linux86_64 folder. Not able to understand this. Thanks, Arjun

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Pushing iterators to far?
by Simon Knapp 10 Jan '13

10 Jan '13

Hi All, I'm trying to do some slightly hooky stuff with the iterators library and cannot get the following code to compile. When the second last line of main is uncommented ("ZIter iter(b);"), compilation fails. The error mesages suggest this is a problem with determining the appropriate traversal category of "ZIter". Can anyone advise if this is problem with my code, a bug, am I asking too much of the library, ...? Cheers, Simon Knapp. compiler: Visual Studio 2008 - version 9.0.30729.1 SP //---------------------------------------------------------------------------------------------------------------------------- // begin iterator_tests.cpp //---------------------------------------------------------------------------------------------------------------------------- #include <vector> #include <boost/iterator/filter_iterator.hpp> #include <boost/iterator/zip_iterator.hpp> #include <boost/tuple/tuple.hpp> typedef std::vector<long long> LLGrid; typedef std::vector<float> FloatGrid; typedef LLGrid::const_iterator LLGridIter; typedef FloatGrid::const_iterator FloatGridIter; typedef boost::tuples::tuple<LLGridIter, FloatGridIter> IDAndAreaTuple; typedef boost::zip_iterator<IDAndAreaTuple> IDAndAreaIterator; typedef std::iterator_traits<IDAndAreaIterator>::reference IDAndAreaRef; struct Fnctr { bool operator()(const IDAndAreaRef ref) const { return true; } }; typedef boost::filter_iterator<Fnctr, IDAndAreaIterator> FIter; typedef boost::tuples::tuple<FloatGridIter, FIter> ZIterTuple; typedef boost::zip_iterator<ZIterTuple> ZIter; static ZIterTuple makeZIterTuple( Fnctr const& fnctr, LLGridIter const& beginIdGrid, LLGridIter const& endIdGrid, FloatGridIter const& beginAreaGrid, FloatGridIter const& endAreaGrid, FloatGridIter const& gtgdIter ) { return boost::make_tuple( gtgdIter, boost::make_filter_iterator( fnctr, boost::make_zip_iterator(boost::make_tuple(beginIdGrid, beginAreaGrid)), boost::make_zip_iterator(boost::make_tuple(endIdGrid, endAreaGrid)) ) ); } int main(int argc, char* argv[]) { FloatGrid areaMask, regionStat; LLGrid regionMask; ZIterTuple b(makeZIterTuple(Fnctr(), regionMask.begin(), regionMask.end(), areaMask.begin(), areaMask.end(), regionStat.begin())); //ZIter iter(b); return 0; } //---------------------------------------------------------------------------------------------------------------------------- // end iterator_tests.cpp //----------------------------------------------------------------------------------------------------------------------------

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[units]
by geocentrix 10 Jan '13

10 Jan '13

I am attempting to replace my own Quantity class with boost::units. One thing that is easy in my existing code is to convert a quantity from any unit of pressure into a specific unit, e.g. GPa (gigapascals), using a function ConvertedTo(). For example: Pressure converted_value = existing_value.ConvertedTo(GPa); How do you do this with boost:units.? I have the following things defined: typedef boost::units::quantity<boost::units::si::pressure> Pressure; static const Pressure Pa = 1.0 * boost::units::si::pascals; static const Pressure GPa = 1e9 * Pa; Pressure value(1.0^9 * Pa); How do I display value in GPa? I am missing something very simple and wondered if someone could advise, please? Thanks in advance. Andrew -- View this message in context: http://boost.2283326.n4.nabble.com/units-tp4641179.html Sent from the Boost - Users mailing list archive at Nabble.com.

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[locale] how to sort utf8 std::string?
by Frédéric Bron 09 Jan '13

09 Jan '13

I read std::string from a file encoded in UTF-8. I would like to sort the strings. I think I have to first convert them to wide characters and then sort the resulting output. I have tried to do that with boost::local::conv::to_utf(utf8string, "UTF-8"); But it seems that all non ASCII characters are replaced by the question mark. Here is my program: #include <iostream> #include <fstream> #include <string> #include <boost/locale/encoding.hpp> int main(int argc, char **argv) { if (argc<2) return 0; std::ifstream is(argv[1], std::ios::binary); while (is) { std::string line; std::getline(is, line); if (not line.empty()) { try { std::wstring ws=boost::locale::conv::to_utf<wchar_t>(line, "UTF-8", boost::locale::conv::stop); std::wcout<<ws; } catch (...) { std::cout<<"exception\n"; } } } is.close(); return 0; } Frédéric

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