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namespace and directory name choice
by Hicham Mouline 16 Aug '08

16 Aug '08

hello, technically, this is not a boost question. I am writing a library to be used by third-party developers. Internally, i use boost::mpl sequences. Joaquin wrote mpl sequences cross-product metafunctions that i use, i called them sequence2_cross_product and sequence3_cross_product for the x-product of 2 and 3 sequences. I put the metafunction in a separate header file. I don't intend to expose it to my clients. Is there an agreed convention/style as to where such a header file should lie? My namespace hierarchy reflects my directory structure, so this is like asking in which namespace should i put this metafunction. I would have like to see such metafunctions already in boost::mpl., so should/can i highjack boost::mpl namespace in my header? or put it at toplevel right below my namespace ? rds,

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Re: [Boost-users] [boost] Boost 1.36.0 release notice
by David Abrahams 15 Aug '08

15 Aug '08

on Fri Aug 15 2008, Stefan Seefeld <seefeld-AT-sympatico.ca> wrote: > David Abrahams wrote: >> on Fri Aug 15 2008, Stefan Seefeld <seefeld-AT-sympatico.ca> wrote: >> >> >>> Why can't the packaging process be automatized, making it fully >>> reproducible ? Trying to increase the amount of tests run on the final >>> package attacs the problem from the wrong end, IMO. >>> >> >> reproducability != correctness. >> >> I agree that automation is a good idea, but it might also be a good idea >> to test the results of that automation, neh? >> > Indeed. My point, however, was that I would *first* automatize, *then* > validate. The point of reproducibility is to cut down on the amount of > (repeated) validation you have to do afterwards, no ? :-) Makes sense to me. -- Dave Abrahams BoostPro Computing http://www.boostpro.com

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Re: [Boost-users] [boost] Boost 1.36.0 release notice
by David Abrahams 15 Aug '08

15 Aug '08

on Fri Aug 15 2008, Stefan Seefeld <seefeld-AT-sympatico.ca> wrote: > Why can't the packaging process be automatized, making it fully > reproducible ? Trying to increase the amount of tests run on the final > package attacs the problem from the wrong end, IMO. reproducability != correctness. I agree that automation is a good idea, but it might also be a good idea to test the results of that automation, neh? -- Dave Abrahams BoostPro Computing http://www.boostpro.com

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[Thread] Resetting interruption request
by Christian Larsen 15 Aug '08

15 Aug '08

Hello, I'm afraid this is a frequently asked question, but my attempts at searching have not been successful. My question is whether there is a smarter way to reset the interruption request (if any) than this: try { boost::this_thread::interruption_point(); } catch (boost::thread_interrupted&) { // ignore } Which I find a little messy for what I want to achieve. I'm using version 1.35.0. Best regards, Christian Larsen

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recursive_timed_mutex::timed_lock()
by Eduardo Tavares 15 Aug '08

15 Aug '08

Hello ALL, I'm having problems using recursive_timed_mutex::timed_lock() on Linux -- an assertion failure occurs at line 171 (thread/pthread/recursive_mutex.hpp) : pthread_mutex_timedlock() returns ETIMEDOUT instead of expected EBUSY. After some hours of headache I checked out it's cousin -- mutex::timed_lock() -- and realized the (in my opinion) correct implementation. Is it a bug in recursive_timed_mutex.hpp ? Thanks in advance. Eduardo Tavares.

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Thread example using a function object and using the return value
by Stephen Torri 15 Aug '08

15 Aug '08

I would like to have a function object that I can use the return value of its operator() function. Here is what I think best explains my request class Apple { public: int operator()( int x ) { int value = x * 2; return value; } } void main (int, char**) { int thread_count = 2; // 2-Core cpu // Create a pool of Apple threads typedef boost::shared_ptr<boost::thread> Thread_Ptr_t; typedef std::list < Thread_Ptr_t > Thread_Pool_t; Thread_Pool_t m_thread_pool; // Create threads for ( int index = 0; index < thread_count; ++index ) { Thread_Ptr_t new_thread_ptr ( new boost::thread ( boost::bind ( &Apple, _1, )( index ) ) ); m_thread_pool.push_back ( new_thread_ptr ); } // Wait for all threads to finish for ( Thread_Pool_t::iterator pos = m_thread_pool.begin(); pos != m_thread_pool.end(); ++pos ) { (*pos)->join(); } } Where is the point I should be catching return from the operator() function? I want the thread to do work and then have the opportunity to get some results from it. Is there a code example someone can show me? Stephen

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user-config.jam settings for building boost::MPI on windows Intel?
by Jesse Perla 15 Aug '08

15 Aug '08

I am trying to build the boost::mpi (1.36) on: 1) Windows vista 2) Visual Studio 2008 3) Intel C++ 10.1 (though could switch to the built in Microsoft compiler here if it would help) 4) With the open source MPICH2 libraries installed. I can link, compile, and test properly according to the beginning of the MPI intstructions ( http://www.boost.org/doc/libs/1_35_0/doc/html/mpi/getting_started.html) Now, I added "using intel ; " and "using mpi ; " to my user-config.jam, but I guess it can't autodetect since it spits out: C:\apps\boost\boost_1_36_0>bjam --with-mpi > The system cannot find the path specified. > The system cannot find the path specified. > The system cannot find the path specified. > MPI auto-detection failed: unknown wrapper compiler mpic++ > > Does anyone know the set of config settings that would work for the setup I described? When I tried to get debugging info out of the build, it said something about trying to detect windows cluster server, which I am not using (instead, MPICH2 as above). I guess part of the question is whether Intel C++ needs a "wrapper compiler" as discussed later in the getting started. Since I was able to compile and run the (non boost) MPI code, it doesn't seem so to me. (or are there binaries for the MPI libraries? I had trouble finding them...) Thanks, Jesse

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Pooling for fragmentation problem
by rottyguy 15 Aug '08

15 Aug '08

Hi, I am new to boost and was looking for a little guidance in using the right pool classes to help me with memory fragmentation. I have a hash_map indexed by a std::string --> smart_ptr<bufferObject> where bufferObject is a struct that holds a dynamically created char[] buffer and length integer. As this hash_map will hold millions of records (gigabytes of data), there will be plenty of objects created/destroyed many times over the amount of memory available to the system. I would like to employ a recyclable memory pool (to combat memory fragmentation). Here are my dynamic objects: key - std:string --> allocates based on a given string during an insert (a few 100 bytes to 2k max) value - bufferObject --> allocated to be held by the smart_ptr. bufferObject, itself, will hold dynamically allocated data. These bytes can range from a few hundred bytes to 4k max hash_map - millions of these key/value pairs created/destroyed. various vectors that are used throughout to copy over portions of the cache for retrieval. Any guidance is appreciated. TIA

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mpl
by Hicham Mouline 15 Aug '08

15 Aug '08

hello, relating to my earlier post, the code for the 2-seq and 3-seq cross product is: #include <boost/mpl/pair.hpp> #include <boost/mpl/placeholders.hpp> #include <boost/mpl/fold.hpp> #include <boost/mpl/vector/vector10.hpp> #include <boost/mpl/copy.hpp> #include <boost/mpl/transform.hpp> namespace mpl = boost::mpl; using namespace mpl::placeholders; template <typename T> struct pair_with : mpl::pair<T, _> {}; template <typename pair> struct triple_with : mpl::vector3<typename pair::first, typename pair::second, _> {}; // public metafunction template<typename Sequence1, typename Sequence2> struct sequence2_cross_product : mpl::fold< Sequence1, mpl::vector0<>, mpl::copy< mpl::transform< Sequence2, pair_with<_2> >, mpl::back_inserter<_1> > > {}; template< typename SequencePair, typename Sequence> struct seq_seqpair_product : mpl::fold< SequencePair, mpl::vector0<>, mpl::copy< mpl::transform< Sequence, triple_with<_2> >, mpl::back_inserter<_1> > > {}; // public metafunction template<typename Sequence1,typename Sequence2,typename Sequence3> struct sequence3_cross_product : seq_seqpair_product< typename sequence2_cross_product<Sequence1,Sequence2>::type, Sequence3> {}; usage is like: S1: any MPL sequence with T11, T12, T13...T1k types S2: any MPL sequence with T21, T22, T23...T2m types S3: any MPL sequence with T31, T32, T33...T3n types typedef sequence2_cross_product<S1, S2>::type binary_product; /* this will be a mpl::vector< pair<T11, T21>, pair<T11, T22>, ... pair<T11, T2m>, pair<T12, T21>, pair<T12, T22>, ... pair<T1k, T2m> > */ // and typedef sequence3_cross_product<S1, S2, S3>::type ternary_product; /* this will be same mpl::vector, but with vector3<T11, T21, T31> ..... instead */ 1) I'm trying to make these metafunctions general enough, perhaps in the future i might use them for something i'm not thinking about now.... i would like to let the caller (me), choose what tuple/template to embed the resulting Tij, Tkl in... . for the sequence2_cross_product metafunction, mpl::pair, or mpl::vector2 or any class template that takes 2 type template arguments, or i could restrict the user to something that interacts well with mpl, is it "lambda expressions" or "metafct" or "metafct class"? . for the sequence3_cross_product metafunction, mpl::vector3 or any class template that takes 3 type template args... same question 2) I have a class template RT (not metafct or metafct class), that takes 3 template args, for each of these args, i have a list of possible types (in an mpl sequence), then i have a class R. I would like to define 2.1. typedef boost::variant< R, RT<T11, T21, T31>, RT<T11, T21, T32>.... > R; 2.2. do an explicit template instantiation of all the RT<..,..,..> Should i use Boost.PP for this, e.g.: #include <boost/preprocessor/seq/for_each_product.hpp> #include <boost/preprocessor/seq/enum.hpp> #define Type1 (T11)(T12)(T13)...(T1k) #define Type2 (T21)(T22)(T23)...(T2k) #define Type3 (T31)(T32)(T33)...(T3k) #define M(r, product) template class RT<BOOST_PP_SEQ_ENUM(product)>; BOOST_PP_SEQ_FOR_EACH_PRODUCT(M, (Type1)(Type2)(Type3)) #undef Type1 #undef Type2 #undef Type3 #undef M and what about variant<...>, how would i write it with PP? comment, thoughsts are appreciated, thanks, regards,

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New compiler warnings triggered by Boost 1.36
by cowwoc 15 Aug '08

15 Aug '08

When I compile my code against Boost 1.36 I get: 3>C:\Program Files\boost_1_36_0\boost/config/abi_prefix.hpp(19) : warning C4103: 'c:\program files\boost_1_36_0\boost\config\abi_prefix.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>C:\Program Files\boost_1_36_0\boost/thread/exceptions.hpp(22) : warning C4103: 'c:\program files\boost_1_36_0\boost\thread\exceptions.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>C:\Program Files\boost_1_36_0\boost/config/abi_suffix.hpp(20) : warning C4103: 'c:\program files\boost_1_36_0\boost\config\abi_suffix.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>C:\Program Files\boost_1_36_0\boost/thread/exceptions.hpp(108) : warning C4103: 'c:\program files\boost_1_36_0\boost\thread\exceptions.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>C:\Program Files\boost_1_36_0\boost/config/abi_prefix.hpp(19) : warning C4103: 'c:\program files\boost_1_36_0\boost\config\abi_prefix.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>c:\program files\boost_1_36_0\boost\thread\win32\thread_primitives.hpp(151) : warning C4103: 'c:\program files\boost_1_36_0\boost\thread\win32\thread_primitives.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>C:\Program Files\boost_1_36_0\boost/config/abi_suffix.hpp(20) : warning C4103: 'c:\program files\boost_1_36_0\boost\config\abi_suffix.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>c:\program files\boost_1_36_0\boost\thread\win32\thread_primitives.hpp(396) : warning C4103: 'c:\program files\boost_1_36_0\boost\thread\win32\thread_primitives.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>C:\Program Files\boost_1_36_0\boost/config/abi_prefix.hpp(19) : warning C4103: 'c:\program files\boost_1_36_0\boost\config\abi_prefix.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>c:\program files\boost_1_36_0\boost\thread\win32\interlocked_read.hpp(14) : warning C4103: 'c:\program files\boost_1_36_0\boost\thread\win32\interlocked_read.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>C:\Program Files\boost_1_36_0\boost/config/abi_suffix.hpp(20) : warning C4103: 'c:\program files\boost_1_36_0\boost\config\abi_suffix.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) 3>c:\program files\boost_1_36_0\boost\thread\win32\interlocked_read.hpp(78) : warning C4103: 'c:\program files\boost_1_36_0\boost\thread\win32\interlocked_read.hpp' : alignment changed after including header, may be due to missing #pragma pack(pop) I don't recall seeing this in 1.35 and I compiled against it two days ago. I am compiling under Visual Studio 2008, in x64 mode. How do I fix these warnings? Thank you, Gili -- View this message in context: http://www.nabble.com/New-compiler-warnings-triggered-by-Boost-1.36-tp18994… Sent from the Boost - Users mailing list archive at Nabble.com.

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