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[fusion] pair documentation issues
by Steven Watanabe 17 Jul '08

17 Jul '08

AMDG The documentation of fusion::pair has a number of problems http://www.boost.org/doc/libs/1_35_0/libs/fusion/doc/html/fusion/support/pa… template <typename First, typename Second> struct first; Should be template<class Pair> struct first; Similarly for second. Also, there is a missing ` in the expression semantics table, which looks horrible as a result. In Christ, Steven Watanabe

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[system] documentation bug, error_code::value_type
by Arvid Norberg 17 Jul '08

17 Jul '08

The boost.system documentation mentions a value_type typedef in boost::system::error_code several times in: http://www.boost.org/doc/libs/1_35_0/libs/system/doc/reference.html#Class-e… In ther header file there is no such typedef, just an int is used. I've filed a ticket here: http://svn.boost.org/trac/boost/ticket/2125 -- Arvid Norberg

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[lambda] Composing lambda expressions
by Robert Jones 17 Jul '08

17 Jul '08

Given a bit of code like this, struct S { bool pred( ) const; }; typdef vector<pair<string, S *> > V; V :: const_iterator i; i -> second -> pred( ); I'd like to rewrite the last line as a lambda expression. Looking at the documentation, I think this is done with bind( & S :: pred, bind( & V :: value_type :: second, _1 ) )( * i ); which works. But I'd rather be writing something like ( _1 -> second -> pred )( * i ); Am I right in thinking that Boost.Lambda just doesn't work like this, and the frst form is how it's done? Thanks, Rob.

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[fusion] constructing all elements of the fusion vector with the same argument
by Stjepan Rajko 17 Jul '08

17 Jul '08

Hello, I recently ran into a need to initialize a fusion vector with a single argument which is then used to construct all of the vector elements. For example, something that would allow: fusion::vector<int, float, double> ones(initialize_all_with(),1); // at_c<0>(ones) == 1 // at_c<1>(ones) == 1.0f // at_c<2>(ones) == 1.0; I hacked fusion::vector so that the above works. Is this addition of interest to anyone else? There is another (perhaps more elegant) solution in implementing a new fusion "array" Sequence (one where all element types are identical) which can construct all elements from a single constructor argument, and then using that sequence to do the above initialization. E.g., fusion::vector<int, float, double> ones(fusion::array<int, 3>(1)); ... or (another solution) a make_array function that returns a fusion::vector: fusion::vector<int, float, double> ones(fusion::make_array<3>(1)); It would be great if one of these solutions (or a different solution) were added to fusion. I can take a stab at putting something together, if any of them are acceptable. That is, unless this is already possible in some way that I can't see at the moment :-) Regards, Stjepan

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Possible MingW ASIO bug with Boost 1.35.0 g++ 4.2.1
by Jason Turner 17 Jul '08

17 Jul '08

Some ASIO test code is crashing in a way that I do not understand. GDB is unable to debug it (no stack available on crash) and the error is a rather obtuse "This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information." Test code which crashes: #include <boost/asio/ip/address.hpp> #include <iostream> int main() { std::cout << boost::asio::ip::address::from_string("1.1.2.3") << std::endl; } By changing the asio file included, the code no longer crashes: #include <boost/asio.hpp> #include <iostream> int main() { std::cout << boost::asio::ip::address::from_string("1.1.2.3") << std::endl; } This is windowsxp professional, gcc version 4.2.1-dw2. I'm unable to test this on Linux at the moment, so I do not know if it affects other platforms. -Jason -- http://emptycrate.com Games, Programming, Travel & other stuff

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[iochain] mutable_buffer issues
by Robert Dailey 17 Jul '08

17 Jul '08

Assume the following code, which I wrote in an attempt to test very basic functionality of Boost.Iostream: namespace io = boost::io; void foo() { std::vector<boost::uint8_t> data; io::source<io::iobyte> src( io::chain( io::read_mem( data ) ) ); io::iobyte rcvbuffer; const io::mutable_buffer<io::iobyte> mutbuffer( &rcvbuffer, sizeof( rcvbuffer ) ); src.read( mutbuffer ); } The first issue I have is with mutable_buffer. Notice how it requires a template argument that *must* be the exact type passed into the io::source template parameter, in this case io::iobyte. Passing any other type in here results in lots of compiler errors on MSVC 9. Basically my biggest issue with this is that I can't pass an "int" into the mutable_buffer here if I want to read 4 bytes, because the type passed in must match io::iobyte. In my opinion, mutable_buffer should accept *any* type and just read in the number of bytes requested. Without this I fail to see the usefulness of mutable_buffer. The second issue has to do with the type of the first parameter in io::source::read(). Notice it takes a "const mutable_buffer&". Why is it taking a const mutable_buffer if the buffer is mutable? This seems conceptually wrong. I would expect it to take a "mutable_buffer&".

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[math][constants] Documentation?
by Michael Marcin 17 Jul '08

17 Jul '08

I found the math constants library in the 1.35.0 release and it looks like it will be useful to me. I can't find it documented anywhere however. It is not in a detail folder so I assume it is a public library. I've found documentation for a Math Constants library on yahoo groups from what looks like the initial review of this library. http://lists.boost.org/Archives/boost/2003/06/48724.php Is this the same library? Where did the documentation go? Thanks, Michael Marcin

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[iochain] Suggestion for chain
by Robert Dailey 17 Jul '08

17 Jul '08

Hi, Currently I'm doing this: namespace io = boost::io; std::vector<boost::uint8_t> data; io::source<io::iobyte> src( io::chain( io::read_mem( data ) ) ); Notice how I have to specify io::chain() explicitly. Would it be possible for it to be implicitly constructable from a stub? This would allow me to clean up the code a bit to this: namespace io = boost::io; std::vector<boost::uint8_t> data; io::source<io::iobyte> src( io::read_mem( data ) ); Doing this results in compiler errors right now. Finding the solution to the problem (as obvious as it seems) took a long time for me.

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[asio] SSL documentation
by Michael Marcin 17 Jul '08

17 Jul '08

The ASIO documentation leaves a lot to be desired when it comes to its SSL support. All the SSL related classes have 1 line of meaningless documentation in the reference section. There is 1 SSL related example with no comments in it. There is no mention of SSL in the Tutorial or Design sections. Has anyone written some documentation, a blog, or even a newsgroup post about the SSL portion of ASIO? Thanks, Michael Marcin

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[iochain] Overloaded >> and << operators?
by Robert Dailey 17 Jul '08

17 Jul '08

Hi, Reading through the documentation for the Boost.Iochain library, I do not see that any default >> and << operators have been provided. I would expect to be able to use these to stream data out of a stream and into a stream, respectively. An example of the >> operator would be below: template< typename t_type > source& operator>> ( source& stream, t_type& data ) { stream.read( data ); return stream; }

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[1.36.0] Beta plans
by Beman Dawes 17 Jul '08

17 Jul '08

According to the schedule, a 1.36.0 beta release is due today. I'm going to delay the beta because there are still too many release regression test failures. See http://beta.boost.org/development/tests/release/developer/summary.html. Developers with release test failures need to redouble efforts to clear those failures. I'll start pester individuals where there doesn't seem to be any movement. The good news is that the number of failures is dropping fairly quickly as backed up merges for several important libraries takes effect, so I don't expect the delay to last more than a few days. Thanks, --Beman

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Boost with Intel/VS
by Adam Black 17 Jul '08

17 Jul '08

Am trying to use boost::circular_buffer. I am using the Intel Compiler v10.1 and am building via VS 2008. Read as the Intel Compiler is bolted up to VS. I am getting the following error: ..\boost_1_35_0\boost/mpl/aux_/integral_wrapper.hpp(80): error: expected an operator 1> operator AUX_WRAPPER_VALUE_TYPE() const { return static_cast<AUX_WRAPPER_VALUE_TYPE>(this->value); } 1> ^ 1> 1>..\boost_1_35_0\boost/mpl/aux_/integral_wrapper.hpp(80): error: identifier "L" is undefined 1> operator AUX_WRAPPER_VALUE_TYPE() const { return static_cast<AUX_WRAPPER_VALUE_TYPE>(this->value); } This is my first foray into boost. I have tried using the Windows install of boost as well as manually changing BOOST_COMPILER_CONFIG "boost/config/compiler/intel.hpp" in boost/config/user.hpp From what I've gleaned thus far that should have solved my issue. But it hasn't. I'm at a loss and as time is short I am going to throw this out there for any tips or suggestions. Thank you.

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Separate Boost newsgroups for individual Boost libraries
by Edward Diener 17 Jul '08

17 Jul '08

I would like to suggest that Boost have separate NGs for each individual library. I also think, for each individual library, a separate user and developer NG should exist. While this will lead to many more NGs, it will make it much easier for users/developers to have concerns addressed for a particular Boost library, and to have the implementor of that library address those concerns. Also of course it will make it easier for people interested, or working with, a particular Boost library, to go to the appropriate NG to read about any issues brought up regarding that library. This is especially important as more Boost library are developed. If a post deals with issues that can not constrained to a single library, it can go to the current 'user' or 'devel' NG as appropriate.

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[smart_ptr> C++0x unique_ptr ?
by Loïc Joly 17 Jul '08

17 Jul '08

Hello, I was wondering whether there was any plan to implement a unique_ptr in boost, that would replace scoped_ptr, and would default to scoped_ptr on compilers lacking move semantic? Best regards, -- Loïc

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Fwd: [GIL] Point concept
by Felipe Magno de Almeida 17 Jul '08

17 Jul '08

---------- Forwarded message ---------- From: Felipe Magno de Almeida <felipe.m.almeida(a)gmail.com> Date: Thu, Jul 10, 2008 at 3:28 AM Subject: [GIL] Point concept To: boost-users(a)lists.boost.org Hi, PointNDConcept is defined as having axis_value member functions. But the GIL code in the boost trunk doesn't comply with this requirement. A free axis_value function is just useless, because it can't be found by ADL when template parameters are passed explicitly. Also, member template axis doesn't model Metafunction. Am I missing something? Regards, -- Felipe Magno de Almeida -- Felipe Magno de Almeida

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[1.36.0] Libraries with unmerged changed - more accurate results.
by Beman Dawes 17 Jul '08

17 Jul '08

Below is a more accurate list of headers and libraries whose header files appear to differ between the trunk and branches/release. The most likely causes are: * Changes that should be merged into branches/release for 1.36.0. If that is the case, developers need to merge these changes right away! * Work in process that should *not* be merged into branches/release for 1.36.0. Please let me know that that is the case so I can stop worrying:-) * Although it seems to be working much better, there still may be issues with the script used to generate the report. Please let me know so the script can be improved. Thanks, --Beman Headers: any.hpp concept_check.hpp enable_shared_from_this.hpp intrusive_ptr.hpp lexical_cast.hpp make_shared.hpp memory_order.hpp operators.hpp pointer_cast.hpp pointer_to_other.hpp rational.hpp scoped_array.hpp scoped_ptr.hpp shared_ptr.hpp smart_cast.hpp static_assert.hpp static_warning.hpp swap.hpp tokenizer.hpp weak_ptr.hpp Libraries: asio bimap circular_buffer config date_time detail filesystem function function_types graph interprocess intrusive iostreams iterator math mpl numeric optional parameter pool program_options property_tree python regex serialization signals spirit statechart system test tr1 type_traits units utility

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[any] small buffer optimizations?
by Thorsten Ottosen 16 Jul '08

16 Jul '08

Hi, As eplained in http://www.codeproject.com/KB/cpp/dynamic_typing.aspx boost::any is not exactly optimal w.r.t. efficiency. Diggins implementation avoid allocation for objects smaller or equal to sizeof(void*). Personally I think this is too small a buffer; Boost.Function uses at least two words; I think it might be worth to go for 3 words. Would anyone be interested in implementing this? best regards -Thorsten

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Help with Access Violation in simple serialization
by Tiago da Silva 16 Jul '08

16 Jul '08

Hi there, I am having some serious problems when trying to instantiate either a boost::archive::xml_oarchive or a boost::archive::text_oarchive: everytime I receive an "Unhandled exception at XXX (msvcr90d.dll) in XXX : Access violation writing location" I have simplified a test case up to this: structure I want to save (in whatever.h): typedef struct s_pt { int x; int y; bool operator< (const struct s_pt &spt2) const { return (x < spt2.x) && (y < spt2.y); } bool operator== (const struct s_pt &spt2) const { return (x == spt2.x) && (y == spt2.y); } template<class Archive> // turns into a serializable component void serialize(Archive &ar, const unsigned int version) { using boost::serialization::make_nvp; ar & make_nvp("x", x); ar & make_nvp("y", y); } } POINT2D; saving routine in main.cpp std::ofstream ofs("savedProject.imag3d"); boost::archive::xml_oarchive oa(ofs); const structs::POINT2D p = {111, 222}; oa << boost::serialization::make_nvp("p2d", p); but I get this error in boost::archive::xml_oarchive oa(ofs); I have tried already both xml_oarchive and text_oarchive... but the demo.cpp provided by http://www.boost.org/doc/libs/1_35_0/libs/serialization/doc/index.html involving the bus routes works!!! what am I doing wrong??? I use Visual Studio 2008. Thanks in advance, Tiago

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[GIL] 3d image support
by Falco Hirschenberger 16 Jul '08

16 Jul '08

Hi, As I read from the documentation, GIL supports N-dimensional image concepts but lacks an Implementation of 'PointNDConcept', 'RandomAccessNDImageViewConcept', 'RandomAccessNDImageConcept' and 'RandomAccessNDLocatorConcept' for 3d images. Has anybody implemented these as extension to GIL or is it on the TODO list? What do you think will be the effort to implement them? Is it a no-brainer by just implementing the concepts similar to the 2d counterparts or will there be some difficulties from the design? Greetings, Falco

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[1.35.0] Serialization demo.cpp problem
by Scott Woods 16 Jul '08

16 Jul '08

Hi, Just trying to get a comparison going between several different techniques for serialization. After downloading 1.35.0 and using the beautiful auto-installer it was looking pretty good. Trying to compile demo.cpp hasnt gone quite so well; Deleting intermediate files and output files for project 'demo - Win32 Debug'. --------------------Configuration: demo - Win32 Debug-------------------- Compiling... demo.cpp c:\program files\boost\boost_1_35_0\boost\serialization\utility.hpp(50) : error C2989: 'is_bitwise_serializable<struct std::pair<T,`template-parameter258'> >' : template class has already been defined as a non-template class c:\program files\boost\boost_1_35_0\boost\serialization\utility.hpp(50) : error C2988: unrecognizable template declaration/definition c:\program files\boost\boost_1_35_0\boost\aligned_storage.hpp(59) : fatal error C1506: unrecoverable block scoping error Error executing cl.exe. demo.exe - 3 error(s), 0 warning(s) I've searched the mail arachives. There have been a few issues around demo.cpp but they seem unrelated. Anyone know whats going on? Windows XP, Microsoft Visual C++ 2005. Thanks, Scott

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[statechart] test failures on the release branch
by Richard Webb 15 Jul '08

15 Jul '08

Merging the changes in Function to the release branch has caused some failures in the statechart tests (e.g. http://tinyurl.com/6hmxod) So i guess that Statechart needs to be merged as well now? Thanks, Richard Webb

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Re: [boost] Bind question, is there any way to implicitly go through a reference_wrapper?
by Michael Goldshteyn 15 Jul '08

15 Jul '08

"Peter Dimov" <pdimov(a)pdimov.com> wrote in message news:00c501c8e6b1$b3a11f60$6607a80a@pdimov2... > > It doesn't because of the mem_fn behavior that bind inherits. The > argument is not a reference to Crayon and so is assumed to be a smart > pointer to Crayon. mem_fn then tries to invoke get_pointer() on it to obtain a Crayon*. > You should be able to make it compile by adding a get_pointer overload > for > reference_wrapper: > > namespace boost > { > > template<class T> T* get_pointer( reference_wrapper<T> const & r ) { > return r.get_pointer(); > } > > } That would be an awesome addition, since reference_wrapper is an oft-used part of boost and there's really no reason for it not to be automatically traversed, making bind constructs that involve it a little simpler. Thanks, Michael Goldshteyn

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[extension] factory_map::get() suggestion
by Robert Dailey 15 Jul '08

15 Jul '08

Currently, there is no typedef to provide a convenient way to create variables of the return type of boost::extensions::factory_map::get(). For example, right now I have to do this: factory_map fm; std::map<int, factory<word> > & factory_list = fm.get<word, int>(); It would be ideal to do this instead: factory_map fm; factory_map::type& factory_list = fm.get<word, int>(); Could this be done?

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Bind question, is there any way to implicitly go through a reference_wrapper?
by Michael Goldshteyn 15 Jul '08

15 Jul '08

Here is a contrived example that illustrates the issue: #include <boost/bind.hpp> #include <boost/ref.hpp> #include <string> // Define a simple class for our example class Crayon { public: explicit Crayon(const std::string &color=std::string()):m_color(color) {} const std::string &GetColor() const {return m_color;} private: std::string m_color; }; int main(int argc, char *argv[]) { using namespace std; using namespace boost; Crayon cr("blue"); boost::reference_wrapper<const Crayon> crefCr(cr); // This compiles std::string color(boost::bind(&Crayon::GetColor,_1)(cr)); // This also compiles, using an explicit get on crefCr std::string colorFromConstRef(boost::bind(&Crayon::GetColor,boost::bind(&boost::referenc e_wrapper<const Crayon>::get,_1))(crefCr)); // This doesn't compile, however, even though the reference_wrapper class template has // an overloaded operator T& () const function std::string colorFromConstRef2(boost::bind(&Crayon::GetColor,_1)(crefCr)); }

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Re: [boost] [thread_pool]: formal review request
by Oliver Kowalke 15 Jul '08

15 Jul '08

> Do you have formal documentation? > Emil Dotchevski > Reverge Studios, Inc. > http://www.revergestudios.com/reblog/index.php?n=ReCode documentation should be included in the archive Oliver -- GMX startet ShortView.de. Hier findest Du Leute mit Deinen Interessen! Jetzt dabei sein: http://www.shortview.de/wasistshortview.php?mc=sv_ext_mf@gmx

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