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boost.program_options gives ./first: free(): invalid pointer with g++ 4.0.3 and 4.1.0
by William Lederer 01 Aug '06

01 Aug '06

In compiling and testing the 'first.cpp' program from the example directory of the program_options directory, the program fails with the message: *** glibc detected *** ./first: free(): invalid pointer: 0x00000000005104e8 *** I built g++ version 4.1.0 and received the same result. The hardware is AMD opteron 64 bit, the OS is Linux fedora core 4. I had upgraded the compiler earlier to 4.0.3, and all other compiles/execution work fine and also tried 4.1.0 gcc. Nonetheless, I cannot shake the notion that this might be related to the compiler. Are there any ideas regarding what I might try next? Thanks -- William Lederer <wgl(a)ciexinc.com> CIEX, Incorporated

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Re: [Boost-users] performance of template expression
by Sohail Somani 01 Aug '06

01 Aug '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > divyank shukla > Sent: Monday, July 31, 2006 8:06 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] performance of template expression > > snip.... > > My question is does the performance penalty still > exist with g++(4.1) compilers as against boost::lambda > functions. Where are your performance results (hard numbers)? Have you measured them as compared to the rest of your algorithm? For example, if you do the general QR decomposition, chances are that's going to be the slow part. One should usually profile after coding, rather than optimizing prematurely. Generally it's the algorithm that is slow.

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TR: [Serialisation] error with xml_iarchive
by Bruno Poinas 31 Jul '06

31 Jul '06

Hello, I just recently began using the boost library, I want to write and read string to serialized objects with the function 'xml_oarchive' and 'xml_iarchive'. When I execute this code (with visual c++.net v. 7.1) : std::ofstream ofs("C:\\Save.xml"); const wchar_t * ptr; ptr=m_strEdit.GetBuffer(); assert(ofs.good()); boost::archive::xml_oarchive oa(ofs); oa.save(ptr); wchar_t str[512]; std::ifstream ifs("C:\\Save.xml"); boost::archive::xml_iarchive ia(ifs,0); ia.load(str); ifs.close(); the programm failed : Thanks and regards, Bruno POINAS ActiCM S.A. 122, rue du Rocher de Lorzier - Centr'Alp - 38430 - MOIRANS

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[multi_index] illegal indirection compile error
by Themistoklis Bourdenas 31 Jul '06

31 Jul '06

Could you help me understand what I'm doing wrong in the code below? I'm trying to setup a multi_index structure of class B. class A { const std::string& ID(void) const; ... }; class B : public A { ... }; typedef boost::multi_index::multi_index_container< B*, boost::multi_index::indexed_by< boost::multi_index::ordered_unique< boost::multi_index::const_mem_fun<A, const std::string&, &A::ID> > > > BSet; However when I compile VS2005 returns me an "illegal indirection" compile error. Any thoughts? Thanks

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Implementing copy_if using boost::lambda
by Minkoo Seo 31 Jul '06

31 Jul '06

Hi list. I'm trying to implment copy_if using boost::lambda: #include <iostream> #include <string> #include <vector> #include <algorithm> #include <iterator> #include <map> #include <boost/lambda/lambda.hpp> #include <boost/lambda/if.hpp> #include <boost/format.hpp> #include <boost/lambda/bind.hpp> #include <boost/lambda/algorithm.hpp> using namespace std; using namespace boost::lambda; int main() { vector<int> vi; vi.push_back(1); vi.push_back(2); vi.push_back(3); vi.push_back(4); vi.push_back(5); vector<int> vi2; for_each(vi.begin(), vi.end(), if_then(_1 == 1, vi2.push_back(_1))); return EXIT_SUCCESS; } This fails with the errors: lambda_test.cpp: In function 'int main()': lambda_test.cpp:30: error: no matching function for call to 'std::vector<int, std::allocator<int> >::push_back(const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >&)' /usr/lib/gcc/x86_64-redhat-linux/4.0.2/../../../../include/c++ ]/4.0.2/bits/stl_vector.h:602: note: candidates are: void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = int, _Alloc = std::allocator<int>] Does anybody know how to push _1 into vi2? I've tried bind( ), but no luck. Sincerely, Minkoo Seo

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boost::bind question
by Surya Kiran Gullapalli 31 Jul '06

31 Jul '06

Hi, I've a std::map with the following structure. std::map < int, tuple<std::string, std::string> > mapTuple ; typedef map < int, tuple<string, string> > mapTuple ; Now i've say 10 elements in this container. Now i'd like to iterate thru this container and find a specific element which matches a certain criteria. Right now I'm doing this. MapIntTuple::iterator iter ; for (iter = mymap.begin(); iter != mymap.end(); ++iter) { if (iter->second.get<0>() == current_field) break ; } I'd like to iterate thru the container and find the element whose first string in the tuple matches with my search string. How can i do this using boost::lamdba::bind and std::find_if. May be that will help me in understanding boost::bind better. iter = find_if (mymap.begin(), mymap.end(), ???) ; Thanks in advance, Surya

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g++ warning: comparing floating point with == or != is unsafe
by cybernet＠interia.pl 31 Jul '06

31 Jul '06

In: /usr/include/boost/test/floating_point_comparison.hpp inside: template<typename FPT> inline FPT safe_fpt_division( FPT f1, FPT f2 ){ the warning is cause by the code: // Avoid underflow. if( f1 == static_cast<FPT>(0) || f2 > static_cast<FPT>(1) && f1 < f2 * (std::numeric_limits<FPT>::min)() ) return static_cast<FPT>(0); Could someone modify the code to allow it to compile without warnings on g++? Latest CVS version still has this problem. I'm too dumb to think of a reasonable patch to submit - sorry. ---------------------------------------------------------------------- PS. Fajny portal... >>> http://link.interia.pl/f196a

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FW: BOOST_CHECK vs. BOST_CHECK_EQUAL, checking equality of wchar_ts
by Tan Zhi 31 Jul '06

31 Jul '06

According to the document, BOOST_CHECK is the same as BOST_CHECK_EQUAL. However,I found an exception. Which is listed below, where m_mmf.SetLngGetString(1033, 1) returns a const wchar_t* type. Interestingly, the first two tests fail, while the last two pass. BOOST_CHECK(L"A" == m_mmf.SetLngGetString(1033, 1)); BOOST_CHECK(m_mmf.SetLngGetString(1033, 1) == L"A" ); BOOST_CHECK_EQUAL(L"A", m_mmf.SetLngGetString(1033, 1)); BOOST_CHECK_EQUAL(m_mmf.SetLngGetString(1033, 1), L"A"); Can any one please help to explain it? Thanks

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Problems Building Boost 1.33.1 on Ubuntu 5.10 x86 From Scratch
by kfjethro 30 Jul '06

30 Jul '06

I know that there are probably packages available for this platform but for several reasons I need to build Boost 1.33.1 from scratch. I have no problems with compiliing from scratch on Ubuntu 6.06. After unpacking the source files and placing the precompiled bjam executable in the boost source directory, I run the following: cd ./boost_1_33_1 ./bjam -sTOOLS=gcc –-prefix=/usr/local/boost-1.33.1 install My /usr/local/boost-1.33.1 is owned by me and writeable. Any suggestions ? Thanks. The truncated bjam output is : Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (and if you don't know what ICU is then you probably don't need it). --------------------------------------------------------------------- *** If you don't need Boost.Python, you can ignore this section *** *** pass --without-python to suppress this message in the future *** skipping Boost.Python library build due to missing or incorrect configuration couldn't find Python.h in "/usr/include/python2.4" You can configure the location of your python installation by setting: PYTHON_VERSION - The 2-part python Major.Minor version number (e.g. "2.2", NOT "2.2.1") - currently "2.4" PYTHON_ROOT - currently "/usr" The following are automatically configured from PYTHON_ROOT if not otherwise set: PYTHON_LIB_PATH - path to Python library object; currently "/usr/lib/python2.4/config" PYTHON_INCLUDES - path to Python #include directories; currently "/usr/include/python2.4" --------------------------------------------------------------------- Jamfile:278: in load-jamfiles *** argument error * rule stage ( name : sources + : requirements * : local-build * ) * called with: ( : /home/lawrence/boost_1_33_1/boost/compatibility/cpp_c_headers/cwchar /home/lawrence/boost_1_33_1/boost/compatibility/cpp_c_headers/csignal /home/lawrence/boost_1_33_1/boost/compatibility/cpp_c_headers/climits /home/lawrence/boost_1_33_1/boost/compatibility/cpp_c_headers/cfloat /home/lawrence/boost_1_33_1/b <<<< middle truncated >>>>>> r_traits.hpp /home/lawrence/boost_1_33_1/boost/pending/bucket_sorter.hpp /home/lawrence/boost_1_33_1/boost/pending/fibonacci_heap.hpp /home/lawrence/boost_1_33_1/boost/pending/iterator_tests.hpp /home/lawrence/boost_1_33_1/boost/pending/detail/int_iterator.hpp /home/lawrence/boost_1_33_1/boost/pending/detail/property.hpp /home/lawrence/boost_1_33_1/boost/pending/detail/disjoint_sets.hpp : <locate>/usr/local <tree-subdirs>/home/lawrence/boost_1_33_1 <target>install : ) * missing argument name /home/lawrence/boost_1_33_1/tools/build/v1/boost-base.jam:2330:see definition of rule 'stage' being called /home/lawrence/boost_1_33_1/tools/build/v1/bootstrap.jam:21: in boost-build /home/lawrence/boost_1_33_1/boost-build.jam:16: in module scope

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basic_string literals
by Johan Råde 30 Jul '06

30 Jul '06

Does Boost offer any facility for declaring basic_string literals in templates, i.e. something like basic_string<CharType> s = BOOST_STRING("foo"); Thank you, Johan Råde

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