March 2002 - Boost-users - lists.preview.boost.org

RE: [Boost-Users] boost.bind usage
by Swatosh, Joe R NWP 29 Mar '02

29 Mar '02

> -----Original Message----- > From: markus_schoepflin > > Is it just me or is it my compiler (MSVC6SP5)? The following code > gives me an error. Whats wrong? > > #include <boost/bind.hpp> > #include <functional> > > using boost::bind; > > void main() > { > bind(std::greater<int>, _1, _2)(1, 2); > } > > main.cpp(8) : error C2275: 'std::greater<int>' : illegal use of this > type as an expression > > TIA, Markus I'm no expert, but your compiler is telling you exactly whats wrong: you need to create an object to pass to bind. bind(std::greater<int>(), _1, _2)(1, 2); ^^ Joe Swatosh | mailto:Joe.R.Swatosh@usace.army.mil nLink contract employee | mailto:jswatosh@n-link.net US Army Corps of Engineers | Northwestern Division, Portland District CENWP-HDC-P | Hydroelectric Design Center 220 NW 8th Ave | v:(503) 808-4032 Portland, OR 97209 | f:(503) 808-4029 [Non-text portions of this message have been removed]

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bug in rational.hpp
by whastingsnj 28 Mar '02

28 Mar '02

operator /= can produce an unnormalized result in Version 1.27.0 For example, boost::rational<long> x(1,1); boost::rational<long> y(-1,1); x /= y; //at this point x.den = -1 !!!

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boost 1.27.0, type_traits, and CVS
by David B. Held 27 Mar '02

27 Mar '02

I just downloaded the latest version on the web site. I've never really used CVS before, but I tried to grab what appeared to be all the relevant files for type_traits. Now, when I try to use boost::function, I get all this: /usr/local/include/boost/function/function_base.hpp:151: parse error before `>' token /usr/local/include/boost/function/function_base.hpp:153: template argument 1 is invalid /usr/local/include/boost/function/function_base.hpp:153: `type' is not a class or namespace /usr/local/include/boost/function/function_base.hpp:153: ISO C++ forbids declaration of `type' with no type Which points to a line that contains is_stateless<>, which I assume is part of type_traits. So, could someone, in simple terms that a 5-year-old could understand, tell me how to get the latest version of type_traits from CVS? Do I actually need to download CVS software, or can I do it all through the web interface? Thanks. Dave [Non-text portions of this message have been removed]

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location of jam executable
by obhiee 27 Mar '02

27 Mar '02

hi, i d/l'ed the 1_27_0 and have successfully built the jam executable. i went through the documentation for build but am still unclear as to the location from where jam should be run. do i just copy jam into the top level directory where the files were extracted to and run it from there after setting BOOST_ROOT? some posts in this list conveyed the impression that it should be run from within the source library for each library. i find that confusing. isn't it the intent(?) of jam to be able to build the code wherever it may be located provided that the appropriate entry has been made into BOOST_BUILD_PATH/BOOST_ROOT? i apologize since this post is probably somewhat off-topic. sincerely, abhishek.

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Iterator Adaptor?
by David Brownell 27 Mar '02

27 Mar '02

I have a hunch that this has been asked before, but I can't seem to find the answer. I have a struct similar to: struct MyStruct { int i; char c; }; And a functor similar to: struct MyFunctor { void operator()(int i) { //Do something with i } }; Given a container of MyStruct objects, how can I use iterator_adaptor to use MyStruct::i with MyFunctor? Something like: std::vector<MyStruct> v; std::for_each(v.begin(), v.end(), MyFunctor()); I have overridden the dereference method in default_iterator_policies to return the integer, but am at a bit of a loss where to go from here. Am I on the right track? TIA for your help! David Brownell

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Re: linking with boost.threads on solaris 8 with gcc 3.0.3
by Dale Peakall 26 Mar '02

26 Mar '02

> Unfortunately, jam fails to build the test app too. > > The errors reported when trying to link 'test_thread' and are from > thread.o: > undefined reference to nanosleep > undefined reference to sched_yield > > > Hopefully others will have more information for you. > > Lets hope. Adding -lrt -lpthread -lposix4 to the LINKFLAGS for <threading>multi makes an app that links and runs passing the tests. - Dale.

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REPOST: boost.bind usage
by Markus Schöpflin 25 Mar '02

25 Mar '02

Since my first post using the web interface seems to have been lost, I'm trying again via email... Is it just me or is it my compiler (MSVC6SP5)? The following code gives me an error. Whats wrong? #include <boost/bind.hpp> #include <functional> using boost::bind; void main() { bind(std::greater<int>, _1, _2)(1, 2); } main.cpp(8) : error C2275: 'std::greater<int>' : illegal use of this type as an expression TIA, Markus

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boost-current and gcc 3.x on Linux
by Peter Simons 25 Mar '02

25 Mar '02

I once again cvs-updated my copy of the Boost sources and tried to build them on a gcc 3.0.4 Linux machine -- without success. The complete output of the targets that failed to build lays at: http://cryp.to/boost-build-log.txt I would be really nice if someone could help me getting this build to work.

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AmigaOS port of Boost 1.27.0
by Steven Solie 25 Mar '02

25 Mar '02

I've started porting Boost 1.27.0 to AmigaOS for use in a project of mine and I have a few additions and diffs to contribute. I've created a platform file so other AmigaOS users can at least start using the Boost out of the box. 1) boost/config/platform/amigaos.h // (C) Copyright Boost.org 2001. Permission to copy, use, modify, sell and // distribute this software is granted provided this copyright notice appears // in all copies. This software is provided "as is" without express or implied // warranty, and with no claim as to its suitability for any purpose. // See http://www.boost.org for most recent version. #define BOOST_PLATFORM "AmigaOS" #define BOOST_DISABLE_THREADS #define BOOST_NO_CWCHAR #define BOOST_NO_CWCTYPE #define BOOST_NO_STD_WSTRING #define BOOST_NO_SWPRINTF #define BOOST_NO_INTRINSIC_WCHAR_T 2) boost/config/select_platform_config.hpp *** select_platform_config.hpp Thu Feb 07 08:26:04 2002 --- GG:boost/boost/config/select_platform_config.hpp Sat Mar 23 21:54:42 2002 *************** *** 52,57 **** --- 52,61 ---- // IBM # define BOOST_PLATFORM_CONFIG "boost/config/platform/aix.hpp" + #elif defined(__amigaos__) + // AmigaOS + # define BOOST_PLATFORM_CONFIG "boost/config/platform/amigaos.hpp" + #else # if defined(unix) \ 3) libs/graph/test/isomorphism.cpp *** isomorphism.cpp Sun Mar 24 08:23:13 2002 --- Code:Projects/Tests/GCC/boost/isomorphism.cpp Sun Mar 24 10:09:38 2002 *************** *** 36,71 **** using namespace boost; - // Verify that the given mapping iso_map from the vertices of g1 to the - // vertices of g2 describes an isomorphism. - // Note: this could be made much faster by specializing based on the graph - // concepts modeled, but since we're verifying an O(n^(lg n)) algorithm, - // O(n^4) won't hurt us. - template<typename Graph1, typename Graph2, typename IsoMap> - inline bool verify_isomorphism(const Graph1& g1, const Graph2& g2, - IsoMap iso_map) - { - if (num_vertices(g1) != num_vertices(g2) || num_edges(g1) != num_edges(g2)) - return false; - - for (typename graph_traits<Graph1>::edge_iterator e1 = edges(g1).first; - e1 != edges(g1).second; ++e1) { - bool found_edge = false; - for (typename graph_traits<Graph2>::edge_iterator e2 = edges(g2).first; - e2 != edges(g2).second && !found_edge; ++e2) { - if (source(*e2, g2) == get(iso_map, source(*e1, g1)) && - target(*e2, g2) == get(iso_map, target(*e1, g1))) { - found_edge = true; - } - } - - if (!found_edge) - return false; - } - - return true; - } - template <typename Generator> struct random_functor { random_functor(Generator& g) : g(g) { } --- 36,41 ---- 4) boost/property_map.hpp *** property_map.hpp Thu Feb 07 08:25:53 2002 --- GG:boost/boost/property_map.hpp Sun Mar 24 07:55:02 2002 *************** *** 7,12 **** --- 7,13 ---- #ifndef BOOST_PROPERTY_MAP_HPP #define BOOST_PROPERTY_MAP_HPP + #include <cassert> #include <iterator> #include <boost/config.hpp> #include <boost/pending/cstddef.hpp> 5) boost/graph/vector_as_graph.hpp *** vector_as_graph.hpp Thu Feb 07 08:26:31 2002 --- GG:boost/boost/graph/vector_as_graph.hpp Sun Mar 24 08:51:08 2002 *************** *** 35,40 **** --- 35,41 ---- #ifndef BOOST_VECTOR_AS_GRAPH_HPP #define BOOST_VECTOR_AS_GRAPH_HPP + #include <cassert> #include <utility> #include <vector> #include <boost/iterator.hpp> So far, I've only tested the following libraries: graph - some minor fixes needed random - no changes required shared_ptr - no changes required NOTE: I'm using GCC 2.95.3 and STLport 4.5.3 (SGI I/O streams) as a base on AmigaOS 3.9 with Boing Bag 2. Enjoy!

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RE: [Boost-Users] Re: Missing timestamp.c in jam_src
by Jim.Hyslop 25 Mar '02

25 Mar '02

Richard Hadsell [SMTP:hadsell@blueskystudios.com] wrote: > Chris Little wrote: > > You could also get the file out of CVS at > > <http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/*checkout*/boost/boost/tools > > /build/jam_src/timestamp.c?rev=HEAD&content-type=text/plain>. > > Thanks for the suggestions. My only concern is the one I mentioned above. [CRLF line endings] The CVS command-line client automatically puts the appropriate line ending for your platform. This should solve your CRLF/LF problem. -- Jim

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