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[multi_array] operator= requires resize - why?
by Markus Werle 04 Jun '12

04 Jun '12

Hi! IMHO the behaviour of operator= for multi_array is a little bit broken. A lot of preconditions required: template <typename ConstMultiArray> multi_array_ref& operator=(const ConstMultiArray& other) { [...] // make sure the dimensions agree assert(other.num_dimensions() == this->num_dimensions()); assert(std::equal(other.shape(),other.shape()+this->num_dimensions(), this->shape())); Besides the fact that I get mad about asserts instead of exceptions (please change this to a way users may choose) why do we have such an odd behaviour here? >From page 1, line 3 of the docs I cite: "The interface design is in line with the precedent set by the C++ Standard Library containers" - this is not true for operator=, since std::<container>::operator= works fine for me all the time _without_ any resize. Could we please change the behaviour of multi_array::operator= to take care of resize where in need to? IMHO operator= should result in a true copy ignoring previous state. Markus

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Boost logger parameters.
by Mangesh Sawant 04 Jun '12

04 Jun '12

When I use boost for asynchrous logging, application crashes due to low memory. It seems internal queue maintained by boost during asynch logging is causing this problem. Is there any way to limit size of internal queue, during asynch logging. If I switch to synchronous logging there is no crash. Thanks, Mangesh Sawant.

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Using boost for asynchronous logging.
by Mangesh Sawant 04 Jun '12

04 Jun '12

Hi , Using boost logger for asynchronous logging. Application crashes with bas_alloc exception. When I switch to synchronous logging mode there is no crash. It seems in asynchronous mode log queue size keeps growing leading to low memory. Is there any way(i.e a parameter in setting file) to control max log queue size in asynchronous logging. Thanks, Mangesh Sawant.

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[boost] [review] Multiprecision review scheduled for June 8th - 17th, 2012
by Jeffrey Lee Hellrung, Jr. 04 Jun '12

04 Jun '12

Hi all, The review of the proposed Boost.Multiprecision library authored by John Maddock and Christopher Kormanyos has been scheduled for June 8th - June 17th, 2012 and will be managed by myself. >From the Introduction: -------- "The Multiprecision Library provides *User-defined* integer, rational and floating-point C++ types which try to emulate as closely as practicable the C++ built-in types, but provide for more range and precision. Depending upon the number type, precision may be arbitrarily large (limited only by available memory), fixed at compile time values, for example 50 decimal digits, or a variable controlled at run-time by member functions. The types are expression-template-enabled for better performance than naive user-defined types." -------- And from the original formal review request from John: -------- Features: * Expression template enabled front end. * Support for Integer, Rational and Floating Point types. Supported Integer backends: * GMP. * Libtommath. * cpp_int. cpp_int is an all C++ Boost licensed backend, supports both arbitrary precision types (with Allocator support), and signed and unsigned fixed precision types (with no memory allocation). There are also some integer specific functions - for Miller Rabin testing, bit fiddling, random numbers. Plus interoperability with Boost.Rational (though that loses the expression template frontend). Supported Rational Backends: * GMP * libtommath * cpp_int (as above) Supported Floating point backends: * GMP * MPFR * cpp_dec_float cpp_dec_float is an all C++ Boost licensed type, adapted from Christopher Kormanyos' e_float code (published in TOMS last year). All the floating point types, have full std lib support (cos sin exp, pow etc), as well as full interoperability with Boost.Math. There's nothing in principal to prevent extension to complex numbers and interval arithmetic types (plus any other number types I've forgotten!), but I've run out of energy for now ;-) Code is in the sandbox under /big_number/. Docs can be viewed online here: http://svn.boost.org/svn/boost/sandbox/big_number/libs/multiprecision/doc/h… -------- I hope everyone interested can reserve some time to read through the documentation, try the code out, and post a formal review, either during the formal review window or before. I expect to conduct the review in the "traditional" manner, i.e., entirely within the regular boost developers' mailing list (boost(a)lists.boost.org) I will send a reminder of review process details closer to the review window. Thanks! - Jeff

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Boost threads with arguments
by Jamie Lahowetz 04 Jun '12

04 Jun '12

I am trying to pass two arguments to a boost thread using this call: boost::thread workerthread(&SshClient::SSHconnect,&sshclt,1,provec); the method for SSHconnect is: int SSHconnect(int,vector<string>); When I try to make my program I get the errors: /usr/include/boost/bind/bind.hpp: In member function ‘void boost::_bi::list2<A1, A2>::operator()(boost::_bi::type<void>, F&, A&, int) [with F = int (SshClient::*)(int, std::vector<std::basic_string<char> >), A = boost::_bi::list0, A1 = boost::_bi::value<SshClient*>, A2 = boost::_bi::value<int>]’: /usr/include/boost/bind/bind_template.hpp:20:59: instantiated from ‘boost::_bi::bind_t<R, F, L>::result_type boost::_bi::bind_t<R, F, L>::operator()() [with R = void, F = int (SshClient::*)(int, std::vector<std::basic_string<char> >), L = boost::_bi::list2<boost::_bi::value<SshClient*>, boost::_bi::value<int> >, boost::_bi::bind_t<R, F, L>::result_type = void]’ /usr/include/boost/thread/detail/thread.hpp:61:17: instantiated from ‘void boost::detail::thread_data<F>::run() [with F = boost::_bi::bind_t<void, int (SshClient::*)(int, std::vector<std::basic_string<char> >), boost::_bi::list2<boost::_bi::value<SshClient*>, boost::_bi::value<int> > >]’ terminal.cpp:271:1: instantiated from here /usr/include/boost/bind/bind.hpp:313:9: error: no match for call to ‘(boost::_mfi::dm<int(int, std::vector<std::basic_string<char> >), SshClient>) (SshClient*&, int&)’ /usr/include/boost/bind/mem_fn.hpp:314:34: note: candidates are: /usr/include/boost/bind/mem_fn.hpp:340:9: note: R& boost::_mfi::dm<R, T>::operator()(T*) const [with R = int(int, std::vector<std::basic_string<char> >), T = SshClient] /usr/include/boost/bind/mem_fn.hpp:340:9: note: candidate expects 1 argument, 2 provided /usr/include/boost/bind/mem_fn.hpp:345:15: note: const R& boost::_mfi::dm<R, T>::operator()(const T*) const [with R = int(int, std::vector<std::basic_string<char> >), T = SshClient] /usr/include/boost/bind/mem_fn.hpp:345:15: note: candidate expects 1 argument, 2 provided /usr/include/boost/bind/mem_fn.hpp:350:33: note: template<class U> const R& boost::_mfi::dm::operator()(const U&) const [with U = U, R = int(int, std::vector<std::basic_string<char> >), T = SshClient] /usr/include/boost/bind/mem_fn.hpp:357:9: note: R& boost::_mfi::dm<R, T>::operator()(T&) const [with R = int(int, std::vector<std::basic_string<char> >), T = SshClient] /usr/include/boost/bind/mem_fn.hpp:357:9: note: candidate expects 1 argument, 2 provided /usr/include/boost/bind/mem_fn.hpp:362:15: note: const R& boost::_mfi::dm<R, T>::operator()(const T&) const [with R = int(int, std::vector<std::basic_string<char> >), T = SshClient] /usr/include/boost/bind/mem_fn.hpp:362:15: note: candidate expects 1 argument, 2 provided make[2]: *** [terminal.o] Error 1 make[2]: Leaving directory `/home/deadpickle/hprcc_terminal/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/deadpickle/hprcc_terminal' make: *** [all] Error 2 Quite a long error. Not sure what to make of it and could use some help. thank you. -- Jamie Ryan Lahowetz University of Nebraska - Lincoln Graduate Student - Earth and Atmospheric Sciences 402.304.0766 jlahowetz(a)gmail.com

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[mpi] multithreaded/funneled messaging
by Brian Budge 03 Jun '12

03 Jun '12

Hi all - Is boost.mpi able to work with MPI_THREAD_MULTIPLE? If so, how is it specified? Thanks, Brian

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[GIL] color_converted_view usage problem
by Marc-Antoine ARNAUD 02 Jun '12

02 Jun '12

Hi guys, I currently working on TuttleOFX projet, and using Boost GIL to perform some image process. I wan't using color_converted_view to process clamping values on a view, witth a specific ColorConvert (CC) functor. But with the actual code [ https://github.com/tuttleofx/TuttleOFX/blob/master/libraries/terry/src/terr…] , the pixel_clamp contructor was corretly called, but our functor (void operator()( const SPixel& src, DPixel& dst ) const) wasn't. Does someone have the same bug ? Are they more documentation anywhere on this function ( I'm refering on this link: http://stlab.adobe.com/gil/html/group___image_view_transformations_color_co… ) Thanks, -- Marc-Antoine

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Add a compile flag to bjam?
by Neal Becker 01 Jun '12

01 Jun '12

Using bjam, is there an easy way (preferably on the command line) to add a flag or 2 to the compile (using gcc)? I'd like to add an optimization or 2.

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Re: [Boost-users] problem with boost compilation
by Martin Elzen 01 Jun '12

01 Jun '12

Ohad Barta <sohadb1357(a)gmail.com>wrote: > I installed and compiled boost for my project a long time ago, however now > I fail to repeat on this success on another computer.... > what is the corresponding cmd compilation command? I tried to specify all > the corresponding flags but for some reason it doesn't work,(for example- > despite using the flag --address-model=64, the folder "address-model-64" > wasn't constructed in my folders hierarchy tree, so I guess that this flag > was ignored) There may be other errors, but what jumps out at me right now is that the "address-model=" part does NOT require two minus-signs in front of it...

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[Asio] Compiling DLL project with stdcall calling convention
by Da-Huntha 01 Jun '12

01 Jun '12

I'm using Boost.Asio in a windows DLL project and had to change the calling convention to stdcall, now when I try to build I get the following build errors: 1>C:\boost_1_49_0\boost/asio/ detail/impl/signal_set_service.ipp(74): error C2664: 'signal' : cannot convert parameter 2 from 'void (__stdcall *)(int)' to 'void (__cdecl *)(int)' 1> None of the functions with this name in scope match the target type 1>C:\boost_1_49_0\boost/asio/detail/impl/signal_set_service.ipp(247): error C2664: 'signal' : cannot convert parameter 2 from 'void (__stdcall *)(int)' to 'void (__cdecl *)(int)' 1> None of the functions with this name in scope match the target type I'm using MSVC10. Can anyone help me with these errors? I have no idea what to do with them.

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