September 2008 - Boost - lists.preview.boost.org

install boost_1_34_1 on fedora
by keren hochman 01 Sep '08

01 Sep '08

Im trying to install boost_1_34_1 on fedora (reference to http://www.boost.org/doc/libs/1_36_0...-boost-library<http://www.boost.org/doc/libs/1_36_0/more/getting_started/unix-variants.htm…> ) But after make install i receive the following error message: bin/sh: ./tools/jam/src//bjam: No such file or directory Not all Boost libraries built properly. Could anyone advise me ?

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[boost 1.35][thread] Compile error with GCC 3.2
by Alexander Dong Back Kim 01 Sep '08

01 Sep '08

Dear members, I wrote an application using boost thread. It compiled well with GCC 3.4 but not with 3.2. I'm using Boost version 1.35. When I compile the application it shows the following error messages... /usr/local/include/boost-1_35/boost/config/requires_threads.hpp:47:5: #error "Compiler threading support is not turned on. Please set the correct command line options for threading: -pthread (Linux), -pt hreads (Solaris) or -mthreads (Mingw32)" /usr/local/include/boost-1_35/boost/thread/detail/platform.hpp:67:9: #error "Sorry, no boost threads are available for this platform." /usr/local/include/boost-1_35/boost/thread/thread.hpp:19:2: #error "Boost threads unavailable on this platform" /usr/local/include/boost-1_35/boost/thread/condition_variable.hpp:18:2: #error "Boost threads unavailable on this platform" /usr/local/include/boost-1_35/boost/thread/condition.hpp:13: syntax error before `;' token /usr/local/include/boost-1_35/boost/thread/mutex.hpp:18:2: #error "Boost threads unavailable on this platform" /usr/local/include/boost-1_35/boost/thread/once.hpp:18:2: #error "Boost threads unavailable on this platform" /usr/local/include/boost-1_35/boost/thread/once.hpp:23: type specifier omitted for parameter `once_flag' /usr/local/include/boost-1_35/boost/thread/once.hpp:23: syntax error before `&' token /usr/local/include/boost-1_35/boost/thread/once.hpp: In function `void boost::call_once(...)': The codes were compiled well with boost 1.32 but once I upgraded to 1.35, this error starts occurring. Any ideas or suggestions are welcomed and appreciated. best regards, Alex Kim

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[boost 1.35] Linking problem with GCC 3.2
by Alexander Dong Back Kim 01 Sep '08

01 Sep '08

Hi members, I'm using both GCC 3.2 and 3.4 in different linux machines. The application uses a number of BOOST libraries such as program_options, iosterams, thread and system. When I compiled the application with GCC 3.4 (of course linking correct library files like "libboost_program_options-gcc34-mt"), it compiled well and works well. I did "ldd" to see what library files are linked... and it says... libpthread.so.0 => /lib/tls/libpthread.so.0 (0x0048a000) libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x005e8000) libm.so.6 => /lib/tls/libm.so.6 (0x00372000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00555000) libc.so.6 => /lib/tls/libc.so.6 (0x0023e000) /lib/ld-linux.so.2 (0x00224000) Now, I compiled the same application and link different gcc version of boost library files because it uses GCC 3.2 instead. I compiled it and there was no compile-time error but it cannot be executed because it can't find the target library files. I did "ldd" for the application and now it has all the boost library files... libpthread.so.0 => /lib/tls/libpthread.so.0 (0x0038d000) libboost_system-gcc32-mt-1_35.so.1.35.0 => not found libboost_thread-gcc32-mt-1_35.so.1.35.0 => not found libboost_serialization-gcc32-mt-1_35.so.1.35.0 => not found libboost_program_options-gcc32-mt-1_35.so.1.35.0 => not found libboost_iostreams-gcc32-mt-1_35.so.1.35.0 => not found libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x00b8e000) libm.so.6 => /lib/tls/libm.so.6 (0x007a6000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00179000) libc.so.6 => /lib/tls/libc.so.6 (0x00182000) /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x00d66000) Both machine has the same boost 1.35. Only differences is they have different versions of GCC (3.2 and 3.4). Is there any idea or hints where this problem comes from??? regards, Alex Kim

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F# Units of Measurement
by Mårten Rånge 01 Sep '08

01 Sep '08

This is not C++ but since it was used as an example in the boost mpl book maybe it could insterest some. http://blogs.msdn.com/andrewkennedy/ -- Mårten

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lifetime of ranges vs. iterators
by Arno Schödl 01 Sep '08

01 Sep '08

> When stacking N difference_ranges, the size difference between "fat" and "lean" > iterators is 2^N. Thus in fully generic code where you don't know anything about > the stacking depth, even generating a single fat iterator carries a potentially > exponential penalty. > This fact makes me think that range is not merely a fancy name for a pair of > iterators but a concept in its own right between containers and iterators. > Generic algorithms must be written on the basis of ranges rather than iterators > or take a significant performance hit. To be fair, this hit could be avoided by storing the sub-iterators of the difference_iterator in their factored form, e.g., m_ittrav/m_ittravEnd would be stored as m_ittrav/m_ittravEnd/m_travcommon. But this would put a big burden on the compiler to optimize the frequent compose/decompose operations. For example: *m_ittrav; would become *compose( m_ittrav, m_travcommon ) // common data not used at all and ++m_ittrav; would become m_ittrav=decompose( ++compose( m_ittrav, m_travcommon ) ).first; -Arno -- Dr. Arno Schoedl · aschoedl(a)think-cell.com Technical Director think-cell Software GmbH · Invalidenstr. 34 · 10115 Berlin, Germany http://www.think-cell.com · phone +49-30-666473-10 · toll-free (US) +1-800-891-8091 Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl · Amtsgericht Charlottenburg, HRB 85229

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Boost 1.36.0 release notes missing Circular Buffer changes
by Dean Michael Berris 01 Sep '08

01 Sep '08

Hi, I took a look at the code in trunk and in 1.36.0, and I notice the release notes don't mention the change in behavior of Boost.Circular_Buffer WRT the default constructor. Should we add: Circular Buffer: * default constructor now doesn't allocate memory, and sets the capacity of the buffer to 0 To the 1.36 release notes? -- Dean Michael C. Berris Software Engineer, Friendster, Inc.

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