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program_options: main and other translation units
by Hicham Mouline 10 Dec '09

10 Dec '09

Hello, I have a main.cpp translation unit with the main(int argc, char* argv[]) function. My application runs in 1 of 4 modes. The mode is selected by the command line options, something like --mode1 --mode2 --mode3 --mode4 In main(), I have defined a mode_options instance of options_description, added these modes to it and defined the variables_map 'vm' that will be passed around to functions (1 for each mode) that reside in other translation units. I then get to a try/catch block, where: I store( command_line_parser(argc, argv).options(mode_options).run(), vm ); notify(vm); I have a sanity check that only 1 and at least 1 of the 4 modes is selected. I then call the function relevant to the mode selected, and pass to it 'vm'. In each of these other functions, I have other instances of options_description, reuse the same 'vm' and store again in vm the parsing ran on the appropriate options_description instance. Each mode option has specific suboptions. Question 1: I want the help option to print usage for all modes and all suboptions if no mode is selected. I want the help option to print usage for just 1 mode if a mode is selected. Question 2: I still want to program_options to throw if an unrecognized option is input, however, I throw my own exceptions if an option for mode_i is set with --mode_j for e.g. Question 3: I may eventually move to a GUI (probably c#-based) for passing options. Is there any particular advice to isolate the machinery of program_options from the functional part of my application. A big thanks to the library developer(s) and to the mailing list contributors for all the useful answers. Best regards, H

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mpl: POD decoration with constructors and getters/setters
by Hicham Mouline 10 Dec '09

10 Dec '09

Hello, I posted a question to comp.lang.c++ first and now realize this maybe a mpl or PP question as well. Here is the original question: > Hicham Mouline wrote: >> I have functions that each take 1 parameter. This parameter is of type >> >> struct S { >> <arithmetic_or_bool_type_1> member_name_1; >> <arithmetic_or_bool_type_n> member_name_n; >> }; // n can be of order 10 or so >> >> class C { >> public: >> return_type apply( const S& ) const; >> }; >> >> Now I want to optimize the returned value. > > "Optimize"? > >> I would optimize by fixing any subset of the n members fixed, ie none at >> all, or just member 5, or members 4 and 8, or members 7,3 and n, or n-1 >> members of the {1....n} set. >> >> How can I do this? >> >> maybe >> >> class C{ >> public: >> pair<return_type, S> optimize(...) const; // returns the optimum S >> that gives the best return value > > What's "return_type" here? What does it mean for the return value to be > "the best"? > >> }; >> >> Some interface like this looks nice to me (as a user). >> >> The question is how to pass the fixed members to optimize. A response came as: > If your 'return_type' has to be the same *type*, there is no better > solution than to return an 'S', if the members that you don't want to > "return" are set to some "invalid" value. As an alternative you could > consider supplying another member to 'S', which would indicate the "valid" > or "active" members. You can have another (nested) struct in 'S' with bit > fields: > > struct S { > ... // as you have now > struct { > unsigned use_1:1; > unsigned use_2:1; > ... > unsigned use_n:1; > } which_members_to_use; > }; > My intial email not being clear, further clarifications are here: return_type is just double. C c; S s1; c.apply( s1 ); //// returns double , say 15.0 By optimize, I mean in most cases maximize, but sometimes minimize. So I'm trying to get the largest double by changing parts or all of s1. I was thinking of some metaprogramming magic that would generate automatically S constructors with arguments all the possible subsets of the member fields, and depending on the ctor selected by the user, would set those bits in the nested struct appropriately. This could generate also getters/setters that the optimize function could use. This could be a metafunction that returns a type SS based on the type S. I realize this is definitely a question for boost as well. The C::optimize function would then return the "optimal" S, along with the maximum/minimum double found. The details and meaning of the optimization would be specific to C::optimize. Best regards,

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Boost Unit Testing Macros on Visual Studio 2005/Visual C++ 8.0
by Andrew Leer 10 Dec '09

10 Dec '09

I'm reading this article (http://www.ibm.com/developerworks/aix/library/au-ctools1_boost/?S_TACT=105A…) on the Boost Unit Testing Framework. However I'm having a bit of trouble with the first example, my guess is that they left something out (something that would be obvious to hardcore C++ coders) as IBM often does in their articles. Another possibility is that my Visual Studio 2005 C++ compiler is just too old for the example. #define _MYSTRING #define BOOST_TEST_MODULE stringtest #include <boost/test/unit_test.hpp> #include "stdafx.h" //#include "mystring.h" BOOST_AUTO_TEST_SUITE (stringtest) // name of the test suite is stringtest BOOST_AUTO_TEST_CASE (test1) { /* mystring s; BOOST_CHECK(s.size() == 0); */ BOOST_CHECK(0 == 0); } BOOST_AUTO_TEST_CASE(test2) { /* mystring s; s.setbuffer("hello world"); BOOST_REQUIRE_EQUAL('h', s[0]); // basic test */ BOOST_CHECK(0 == 0); } BOOST_AUTO_TEST_SUITE_END( ) To me the BOOST_AUTO_TEST_SUITE and BOOST_AUTO_TEST_CASE lines look a little suspect (especially since they don't have quotes around the arguments, and they are undeclared identifiers...but this probably means they are macros and I'm not certain I understand the concept or if that is available in VC++ 8.0)... Is there any reason why this code won't work? Bellow are the errors I'm receiving: 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(7) : error C2065: 'stringtest' : undeclared identifier 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(9) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(9) : error C2146: syntax error : missing ';' before identifier 'BOOST_AUTO_TEST_CASE' 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(9) : error C2065: 'test1' : undeclared identifier 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(10) : error C2448: 'BOOST_AUTO_TEST_CASE' : function-style initializer appears to be a function definition 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(18) : error C2065: 'test2' : undeclared identifier 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(19) : error C2448: 'BOOST_AUTO_TEST_CASE' : function-style initializer appears to be a function definition 1>c:\users\andy\documents\visual studio 2005\projects\unittesttests\unittesttests\unittesttests.cpp(29) : fatal error C1004: unexpected end-of-file found

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socket type?
by pedro chaparro 10 Dec '09

10 Dec '09

hi, i wanna to pass the same socket decriptor among differents functions, that way all work over the same socket, but i'm no sure what kinf o data is a socket descriptor? what kind o data must retunr my function? thanks ? getsocket() { } -- Ing Pedro Alonso Chaparro Valero Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain

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[interprocess] mapped_region::flush()
by Stefan Strasser 10 Dec '09

10 Dec '09

Hi, I have a few questions regarding mapped_region. 1. first of all, is mapped_region::flush() safe to use? on linux it is implemented as msync(MS_SYNC) which seems fine, but on windows it uses FlushViewOfFile alone, which IIUC does not flush the changes to disk. MSDN: "The FlushViewOfFile function [...] does not wait to return until the changes are flushed from the underlying hardware disk cache and physically written to disk. To flush all the dirty pages plus the metadata for the file and ensure that they are physically written to disk, call FlushViewOfFile and then call the FlushFileBuffers function." I'm not sure if they really mean "hardware disk cache", since no sync or flush function can entirely make sure of that. but FlushFileBuffers is documented to flush operating system buffers. and the quote above says a call to FlushFileBuffers is necessary. 2. can the mapped memory be accessed while another thread is calling flush()? does that affect the flushing? it is still required that all data that was written to the mapped region at the point of the flush() call is written to disk when it returns. Interprocess' documentation doesn't say anything about that and I can't seem to find any information about that on the underlying functions mmap/FlushViewOfFile either. and 3, not entirely boost related: I get some strange performance results using mapped_region::flush() on linux (not tested on windows so far). I already reduced the flush() calls to a minimum but I still get better performance in many cases using my own filebuf implementation that performs paging without hardware support, using a std::filebuf. using std::filebuf shouldn't be faster than hardware file mapping. when I call flush() relatively frequently that in itself drives performance down, but when I call it less frequently it blocks for noticeable amounts of time. (thus, question 2) do the offset/size arguments to mapped_region::flush() affect performance? I could track what pages are changed, but I was under the assumption the OS already does that. Thanks

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Runtime error with Boost's unit test framework
by Joey Mink 10 Dec '09

10 Dec '09

Hi all, I'm a newbie using the boost unit test framework. I'm getting a run-time exception that presents itself with the following message: Unhandled exception at 0x61c3b130 (msvcr80d.dll) in test.exe: 0xC0000005: Access violation reading location 0xcccccccc. If I step through the code, the exception is thrown the 3rd time this line from Boost is invoked: unit_test_suite_impl.hpp:111 callback0<> const& test_func() const { return m_test_func; } I can't seem to uncover what the problem is - has anyone else had this problem? Might anyone have any insight to my possible misuse of it? I'm linking with libboost_program_options-vc80-mt-gd-1_41.lib. Running Visual Studio 2005 (VC8) Thanks! Joey

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boost::lambda questions
by Peter Foelsche 09 Dec '09

09 Dec '09

I would like to be able to: * return multiple results from a lambda function * use temporary variables inside a lambda function, declared using BOOST_AUTO * I would need the ability to deduce the type of the returned values via BOOST_AUTO to declare the matching variables. I think I could use boost::tuple for this: const BOOST_AUTO(sTupleVar, someThing); const BOOST_AUTO(sFirstResult, get<0>(sTupleVar)); const BOOST_AUTO(sSecond, get<1>(sTupleVar)); But how to declare a local variable inside a lambda function? Peter

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Re: [Boost-users] Problem using Boost regex
by John Emmas 09 Dec '09

09 Dec '09

[Addendum...] Following my original post, firstly, apologies - I should have mentioned that I'm trying to build the regex example using Visual Studio 8 Express Edition (i.e. VC++2005). Also, I've got some more information.... Apart from those libs that I mentioned in my original post, I've found a whole bunch of libs beginning with "libboost-regex-vc80-" and ending with these suffixes:- mt-1_40.lib mt-gd-1_40.lib mt-s-1_40.lib mt-sgd-1_40.lib s-1_40.lib I guess these must be the static link libs. Anyway, I've discovered that if I link to any lib that ends in "mt-1_40.lib" I can build my app and launch it successfully as long as I build in Release mode. But in Debug mode, the app either doesn't launch - or if it does launch, it gives the unhandled exception that I described earlier. Hope that helps, John

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ASIO async I/O with iostream?
by Jay Sprenkle 09 Dec '09

09 Dec '09

Good afternoon all, I'm interested in writing a program using asio. I'm new to both boost and asio. Is it possible to use async I/O with streams? A stream is a good method for what I'm interested in doing but I don't see how to make it work. What I've got so far: A class using event driven async I/O. The class parses the data into variable arbitrary sized messages. I read from the tcp socket into a buffer, then create a stream from the buffer, then deserialize the data from the stream. unsigned char buffer[1024]; // connect receive event socket->async_read_some( boost::asio::buffer(buffer), boost::bind( &TcpConnection::receive, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred ) ); I'd like to be able to skip the buffer and just read directly to the stream with an event to notify me of the arrival of data. Thanks! -- Cause united breaks guitars http://www.youtube.com/watch?v=5YGc4zOqozo

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Bug in mingw with gcc 4.3.0: boost_concept_check.h
by Eloi Du Bois 09 Dec '09

09 Dec '09

Hi all, I found a probable bug in mingw. Here is the minimal code that can not compile: #include <boost/ptr_container/ptr_list.hpp> > > #include <iostream> > > class A > { > public: > A(const int id):_id(id){} > virtual ~A()=0; > bool operator==(const A& other) const { return _id == other._id; } > int _id; > }; > > A::~A(){} > > class B : public A > { > public: > B(const int id):A(id){} > virtual ~B() {} > }; > > class C : public A > { > public: > C(const int id):A(id){} > virtual ~C() {} > }; > > int main() { > typedef boost::ptr_list<A> AList; > AList a,b; > a.push_back( new B(0) ); > a.push_back( new C(1) ); > b.push_back( new B(0) ); > b.push_back( new C(1) ); > > return a == b; > } > And the compilation error: gcc.compile.c++ > T:\Analyse1\dist\lib\bin\gcc-mingw-4.3.0\debug\threading-multi\src\main.o > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/boost_concept_check.h: > In instantiation of '__gnu_cxx::_EqualOpConcept<A, A>': > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/boost_concept_check.h:62: > instantiated from 'void __gnu_cxx::__function_requires() [with _Concept = > __gnu_cxx::_EqualOpCon > cept<A, A>]' > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/stl_algobase.h:943: > instantiated from 'bool std::equal(_II1, _II1, _II2) [with _II1 = > boost::void_ptr_iterator<std::_List_ > const_iterator<void*>, const A>, _II2 = > boost::void_ptr_iterator<std::_List_const_iterator<void*>, const A>]' > T:\Analyse1\3rdParty\boost/boost/ptr_container/detail/reversible_ptr_container.hpp:531: > instantiated from 'bool > boost::ptr_container_detail::reversible_ptr_container<Config, CloneA > llocator>::operator==(const > boost::ptr_container_detail::reversible_ptr_container<Config, > CloneAllocator>&) const [with Config = > boost::ptr_container_detail::sequence_config<A, std:: > list<void*, std::allocator<void*> > >, CloneAllocator = > boost::heap_clone_allocator]' > tests\src\main.cpp:38: instantiated from here > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/boost_concept_check.h:296: > error: cannot declare field '__gnu_cxx::_EqualOpConcept<A, A>::__a' to be of > abstract type 'A' > tests\src\main.cpp:6: note: because the following virtual functions are > pure within 'A': > tests\src\main.cpp:14: note: virtual A::~A() > c:\qt\mingw\bin\../lib/gcc/mingw32/4.3.0/include/c++/bits/boost_concept_check.h:296: > error: cannot declare field '__gnu_cxx::_EqualOpConcept<A, A>::__b' to be of > abstract type 'A' > tests\src\main.cpp:6: note: since type 'A' has pure virtual functions > > "g++" -ftemplate-depth-128 -O0 -fno-inline -Wall -g -mthreads > -DBOOST_SYSTEM_DYN_LINK=1 -I"T:\Analyse1\3rdParty\boost" -I"tests\src" -c > -o "T:\Analyse1\dist\lib\bin\gcc-mingw- > 4.3.0\debug\threading-multi\src\main.o" "tests\src\main.cpp" > The problem might come from this: #define _GLIBCXX_DEFINE_BINARY_OPERATOR_CONSTRAINT(_OP,_NAME) \ template <class _Ret, class _First, class _Second> \ struct _NAME { \ void __constraints() { (void)__constraints_(); } \ _Ret __constraints_() { \ return __a _OP __b; \ } \ _First __a; \ _Second __b; \ } I hope it comes from me and not from boost... If anyone have an idea of what I can do to solve this, It would be great :) Regards, Eloi.

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Problem building boost on Windows
by Nathan Ridge 09 Dec '09

09 Dec '09

Hello, I'm having some trouble building the Boost libraries on Windows. - My OS is Windows Vista SP2 - My compiler in MinGW g++ 4.4. The folder containing the g++ executable is in my PATH environment variable. This is what I've done: - Downloaded the latest version (1.41) of the Boost libraries from www.boost.org and extracted it to C:\Dev\Libraries\boost (so e.g. C:\Dev\Libraries\boost\libs is a subfolder) - Downloaded the latest version (3.1.17) of Boost Jam from http://sourceforge.net/projects/boost/files/boost-jam and extracted bjam.exe into C:\Dev\Libraries\boost - Opened up a command prompt, cd'd into C:\Dev\Libraries\boost - Ran the command "bjam --with-filesystem variant=release link=static threading=single toolset=gcc" The output, up to the first error, is the following: == START BJAM OUTPUT == WARNING: No python installation configured and autoconfiguration failed. See http://www.boost.org/libs/python/doc/building.html for configuration instructions or pass --without-python to suppress this message and silently skip all Boost.Python targets Building the Boost C++ Libraries. After the build, the headers will be located at C:\Dev\Libraries\boost The libraries will be located at C:\Dev\Libraries\boost\stage\lib Use 'bjam install --prefix=<path>' if you wish to install headers and libraries to a different location and remove the source tree. ...patience... ...found 441 targets... ...updating 27 targets... common.mkdir stage common.mkdir stage\lib common.mkdir bin.v2 common.mkdir bin.v2\libs common.mkdir bin.v2\libs\system common.mkdir bin.v2\libs\system\build common.mkdir bin.v2\libs\system\build\gcc-mingw-4.4.0 common.mkdir bin.v2\libs\system\build\gcc-mingw-4.4.0\release common.mkdir bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static gcc.compile.c++ bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\error_code.o g++: libs\system\src\error_code.cpp: No such file or directory g++: no input files "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -DBOOST_ALL_NO_LIB=1 -DBOO ST_SYSTEM_STATIC_LINK=1 -DNDEBUG -I"." -c -o "bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link -static\error_code.o" "libs\system\src\error_code.cpp" ...failed gcc.compile.c++ bin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\error_code.o. .. ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>libboost_system-mgw44-1_41 .lib(clean) for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>error_code.o. .. ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>libboost_system-mgw44-1_41 .lib for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>error_code.o... ...skipped <pstage\lib>libboost_system-mgw44-1_41.lib for lack of <pbin.v2\libs\system\build\gcc-min gw-4.4.0\release\link-static>libboost_system-mgw44-1_41.lib... [more similar errors] == END BJAM OUTPUT == So for some reason, it cannot find libs\system\src\error_code.cpp, which is actually located at C:\Dev\Libraries\boost\libs\system\src\error_code.cpp. Am I supposed to somehow specify the exact path where it should be looking? I tried adding the option --build-dir=C:\Dev\Libraries\boost, but I still get the same error. One suspicious thing that I noticed is that without the --build-dir option, the bin.v2 folder that is created is C:\Dev\bin.v2, as opposed to C:\Dev\Libraries\boost\bin.v2 or something like that. Not sure if this is related to my problem or not. What am I doing wrong? Thanks, Nate. _________________________________________________________________ Windows Live: Keep your friends up to date with what you do online. http://go.microsoft.com/?linkid=9691815

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how to delete references to objects from a container...
by rv_nath 09 Dec '09

09 Dec '09

Hi forum members, I want to use boost's shared_ptr class for the connection pool class that i am writing. However, i have a requirement to delete the connection object (which is going to be the shared-ptr) explicitly based on certain checks like validity and expiry etc. If I store the shared_ptr, I want to know how to delete this explicitly from the stl container. According to my understanding shared_ptrs cannot be 'delete'd. So, how to achieve this...? Thanx in advance and regards, RV -- View this message in context: http://old.nabble.com/how-to-delete-references-to-objects-from-a-container.… Sent from the Boost - Users mailing list archive at Nabble.com.

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How do I copy files and folders using boost and Visual Studio 2005?
by leeand00 09 Dec '09

09 Dec '09

I'm trying to use boost::filesystem to copy files and folders (just like a standard copy a folder and paste it in windows explorer). Although I've been to the boost::filesystem documentation, I still don't really know how to go about doing this. Do you have to recursively go though each directory (creating it) and find each file copying it? Additionally, how do you copy the file in C++/Boost? P.S. I'm using Boost 1.40.0 Update I think I may have ended up creating an answer to this one, only concern being that I don't do any try-catch errors to check for locked files and folders. The following code makes a copy of a directory in the relative path "../example/ecomm" and duplicates it to a non-existing path "../example/dup_ecomm": #include <boost/test/unit_test.hpp> #include <boost/algorithm/string.hpp> #include <boost/filesystem/operations.hpp> #include <boost/regex.hpp> #include <iostream> #include <fstream> #include<string> bool copy_dir( const boost::filesystem::path & ext_dir_path, // the existing directory const boost::filesystem::path & duplicate_dir_path // the duplicate directory ) { std::cout << "BEGIN: copy_dir " << endl; std::cout << "- ext_dir_path: " << ext_dir_path << endl; std::cout << "- duplicate_dir_path: " << duplicate_dir_path << endl; // 1. Ensure that the directory we are trying to copy exists. if (!boost::filesystem::exists( ext_dir_path ) ) return false; bool createdDir = boost::filesystem::create_directory( duplicate_dir_path ); // cout << "createdDir: " << createdDir << endl; copy_dir(ext_dir_path, // the existing directory duplicate_dir_path, // the duplicate directory, ext_dir_path, // the base path for the existing directory duplicate_dir_path, true); std::cout << "END: copy_dir " << endl; } bool copy_dir( const boost::filesystem::path & ext_dir_path, // the existing directory const boost::filesystem::path & duplicate_dir_path, // the duplicate directory, const boost::filesystem::path & base_ext_dir_path, // the base path for the existing directory const boost::filesystem::path & base_duplicate_dir_path, // the base path for the duplicate of the exisiting directory bool isRootPath) { // Debug input arguments std::cout << "BEGIN: copy_dir " << endl; std::cout << "- ext_dir_path: " << ext_dir_path << endl; std::cout << "- duplicate_dir_path: " << duplicate_dir_path << endl; std::cout << "- base_ext_dir_path: " << base_ext_dir_path << endl; std::cout << "- base_duplicate_dir_path: " << base_duplicate_dir_path << endl; std::cout << "- isRootPath: " << isRootPath << endl; boost::filesystem::directory_iterator end_itr; // default construction yields past-the-end cout << "--Beginning itr loop" << endl; for ( boost::filesystem::directory_iterator itr( ext_dir_path ); itr != end_itr; ++itr ) { if ( boost::filesystem::is_directory(itr->status()) ) { cout << "---itr->path(): " << itr->path() << endl; boost::filesystem::path newExtDir(itr->path()); string dup_path = itr->path().string(); boost::algorithm::replace_first(dup_path, base_ext_dir_path.string(), base_duplicate_dir_path.string()); cout << "dup_path: " << dup_path << endl; boost::filesystem::path new_dup_dir(dup_path); bool createdDir = boost::filesystem::create_directory( new_dup_dir ); cout << "creating directory " << dup_path << " created: " << createdDir << endl; boost::filesystem::path newDuplicateDir(duplicate_dir_path); copy_dir(newExtDir, // the existing directory newDuplicateDir, // the duplicate directory, base_ext_dir_path, base_duplicate_dir_path, false); } else { cout << "---isLeaf: " << itr->path() << endl; string dup_path = itr->path().string(); boost::algorithm::replace_first(dup_path, base_ext_dir_path.string(), base_duplicate_dir_path.string()); string src_path = itr->path().string(); cout << "src_path: " << src_path << endl; cout << "dup_path: " << dup_path << endl; boost::filesystem::path s_path(src_path); boost::filesystem::path d_path(dup_path); boost::filesystem::copy_file(s_path, d_path); } } std::cout << "--Ending itr loop" << endl; std::cout << "END: copy_dir " << endl; return false; } test_suite* init_unit_test_suite( int, char* [] ) { boost::filesystem::path ext_dir("..\\example\\ecomm"); boost::filesystem::path dir_dup("..\\example\\dup_ecomm"); copy_dir(ext_dir, dir_dup); // the duplicate directory, // ... unit tests...etc... } My question now is what I'm I forgetting to do in regards to locked files and directories? Additionally this same question has been posted over at http://stackoverflow.com/questions/1853812/how-do-i-copy-files-and-folders-… so that the rest of the programmer community may learn about boost. (You're welcome to answer there if you like). Thank you, Andrew J. Leer ----- Thank you,    Andrew J. Leer - http://leeand00.tiddlyspot.com/ My Blog -- View this message in context: http://old.nabble.com/How-do-I-copy-files-and-folders-using-boost-and-Visua… Sent from the Boost - Users mailing list archive at Nabble.com.

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[Bind] How to create a functor which returns one of its arguments?
by Vadim Guchenko 09 Dec '09

09 Dec '09

Hello, All! Is there a simple way to create a functor that returns one of its arguments _1, _2, ...? Does standard unary functor exist, which simply returns its argument unchanged? I.e.: template<typename T> struct arg: public std::unary_function<T, T> { T operator()(const T &x) const { return x; } }; Then I could write: boost::bind(arg<int>(), _2) to create a functor which returns the value of its second argument, or boost::bind(arg<bool>(), true) to create a functor which always returns true. -- Best regards, Vadim Guchenko [yhw at relost dot net].

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[Regex] Compile error in char_regex_traits.hpp with gcc 3.3.1
by Olexandr Marchenko 09 Dec '09

09 Dec '09

Hi, All I've got a compile error(please see below) while trying to compile my simple program with gcc 3.3.1 and boost 1.41.0. The strange thing is that I was able to compile the program before, but got the error after I had moved the line "include <boost/regex.hpp>" from .cpp file to .h file. At least that's what I think, maybe I've changed something I don't remember about. Anyway, it looks like I have the error even before my code starts compiling. I don't understand the error message at all. Where is this "__attribute__"? I tried to google it but found nothing. I would appreciate any help The error: In file included from d:/pnw/06072009/build/incsys/boost/regex/v4/regex.hpp:55, from d:/pnw/06072009/build/incsys/boost/regex.hpp:31, from d:/pnw/06072009/be/csvrdeng/csvcursor.h:1, from csvcursor.cpp:2: d:/pnw/06072009/build/incsys/boost/regex/v4/char_regex_traits.hpp:36: error: syntax error before `__attribute__' d:/pnw/06072009/build/incsys/boost/regex/v4/char_regex_traits.hpp:44: error: `char_regex_traits_i' is not a template d:/pnw/06072009/build/incsys/boost/regex/v4/char_regex_traits.hpp:47: confused by earlier errors, bailing out char_regex_traits.hpp(with unnecessary defines and comments omitted): namespace boost{ namespace deprecated{ //line 36 template <class charT> class char_regex_traits_i : public regex_traits<charT> {}; template<> class char_regex_traits_i<char> : public regex_traits<char> // line 44 { public: typedef char char_type; //line 47 typedef unsigned char uchar_type; typedef unsigned int size_type; typedef regex_traits<char> base_type; }; } // namespace deprecated } // namespace boost -- Regards, Alexandr

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[Serialization] How to serialize third party library function
by elizabeta petreska 09 Dec '09

09 Dec '09

Hello First all, sorry for my long post, and I hope I will be clear with the question. In my project I have a lot of classes, which I plan to serialize with boost serialization library. Most of my classes have as members third party library classes. The thing is that the third party library classes are very complex and I can't serialize them directly in the standard way i.e I can't say this : template<class Arhive,class MyThirdPartyClass> void serialize(Archive& ar, MyThirdPartyClass& t, const unsigned int version) { ar & t.meber1; ar & t.member2; .... } MyThirdparty library classes all provide their own method for serialization ( storing in custom archive and reading from the archive), so I was thinking to do this : namespace boost { namespace serialization { template<class Archive> inline void save(Archive & ar, const CustomClass& t, const unsigned int version) { /// save t to the custom archive here . } template<class Archive> inline void load(Archive & ar, CustomClass& t, const unsigned int version) { ////// read data from archive and assign to t } } } Now when I do the following : // save data CustomClass* cc=new CustomClass(.....); outarchive & cc; /// later on read CustomClass * rcc=0; inarchive & rcc; delete rcc; /// (*) crash here. delete is operator implemented in my CustomClass I notice that the crash maybe has to do something with that, that my CustomClass implements its own new and delete operators. I know that the default implementation of load_construct data uses operator placement ::new ( global new operator ) to allocate object when loading through pointer, and I am deleting the object above ( * ) with its specific class delete operator. To avoid the mismatch I did this : template<class Archive> inline void load_construct_data(Archive & ar, CustomClass * t, const unsigned int file_version) { new (t) CustomClass; // notice that this is the custom class operator , not :: new } In my suprise (*) is still crashing. Why ? Also I notice that if in load_construct data I am using the global new operator, and when deleting the global ::delete ( i.e :: delete rcc) operator there is no problem at all. But this is not solution, cause I want my CustomClass to use their own specific operators new and delete.

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[multi_index and flyweight]
by Samuel Charron 09 Dec '09

09 Dec '09

Hi, I'm currently facing some limitations from flyweight and multi_index. Let's begin with multi_index: I'd want to have a multi_index storing containers, and have one index based on all the contained elements. For example: two vectors [1 2 3] and [3 4] would be indexed as 1 -> [1 2 3] 2 -> [1 2 3] 3 -> [1 2 3] [3 4] 4 -> [3 4] How would you do that ? Flyweight: I'd like to have a scoped flyweight, without tracking, i.e.: { ... // create some elements } // All elements are deleted when leaving the scope. However, currently I didn't see a method to clear the internal container. One way I could do that would be copying - pasting the hashed_factory and adding a clear method. It would be easier to extend the class, just having the private container be protected. Would that be possible to do one a future release ? Or is there another easy way to do so ? Regards, Samuel

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Re: [Boost-users] [chrono] New Features + Bug fixes + Updated + documentation
by Tan, Tom (Shanghai) 09 Dec '09

09 Dec '09

I have some more results regarding Windows platform to report. I tried with GCC-4.4.0 that's shipped with QT4.6 SDK on the same Win XP sp3 and received some different errors/warnings as pasted below: gcc.compile.c++ bin.v2\libs\chrono\build\gcc-mingw-4.4.0\debug\link-static\runtime-link- static\threading-multi\chrono.o In file included from ./boost/chrono/chrono.hpp:73, from libs\chrono\src\chrono.cpp:13: ./boost/ratio.hpp:66: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:67: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:68: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:79: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:80: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:81: warning: integer constant is too large for 'long' type ./boost/ratio.hpp:66: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:66: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:66: error: template argument 1 is invalid ./boost/ratio.hpp:66: error: template argument 2 is invalid ./boost/ratio.hpp:66: error: invalid type in declaration before ';' token ./boost/ratio.hpp:67: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:67: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:67: error: template argument 1 is invalid ./boost/ratio.hpp:67: error: template argument 2 is invalid ./boost/ratio.hpp:67: error: invalid type in declaration before ';' token ./boost/ratio.hpp:68: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:68: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:68: error: template argument 1 is invalid ./boost/ratio.hpp:68: error: template argument 2 is invalid ./boost/ratio.hpp:68: error: invalid type in declaration before ';' token ./boost/ratio.hpp:69: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:69: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:69: error: template argument 1 is invalid ./boost/ratio.hpp:69: error: template argument 2 is invalid ./boost/ratio.hpp:69: error: invalid type in declaration before ';' token ./boost/ratio.hpp:70: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:70: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:70: error: template argument 1 is invalid ./boost/ratio.hpp:70: error: template argument 2 is invalid ./boost/ratio.hpp:70: error: invalid type in declaration before ';' token ./boost/ratio.hpp:71: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:71: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:71: error: template argument 1 is invalid ./boost/ratio.hpp:71: error: template argument 2 is invalid ./boost/ratio.hpp:71: error: invalid type in declaration before ';' token ./boost/ratio.hpp:72: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:72: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:72: error: template argument 1 is invalid ./boost/ratio.hpp:72: error: template argument 2 is invalid ./boost/ratio.hpp:72: error: invalid type in declaration before ';' token ./boost/ratio.hpp:73: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:73: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:73: error: template argument 1 is invalid ./boost/ratio.hpp:73: error: template argument 2 is invalid ./boost/ratio.hpp:73: error: invalid type in declaration before ';' token ./boost/ratio.hpp:74: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:74: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:74: error: template argument 1 is invalid ./boost/ratio.hpp:74: error: template argument 2 is invalid ./boost/ratio.hpp:74: error: invalid type in declaration before ';' token ./boost/ratio.hpp:75: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:75: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:75: error: template argument 1 is invalid ./boost/ratio.hpp:75: error: template argument 2 is invalid ./boost/ratio.hpp:75: error: invalid type in declaration before ';' token ./boost/ratio.hpp:76: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:76: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:76: error: template argument 1 is invalid ./boost/ratio.hpp:76: error: template argument 2 is invalid ./boost/ratio.hpp:76: error: invalid type in declaration before ';' token ./boost/ratio.hpp:77: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:77: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:77: error: template argument 1 is invalid ./boost/ratio.hpp:77: error: template argument 2 is invalid ./boost/ratio.hpp:77: error: invalid type in declaration before ';' token ./boost/ratio.hpp:78: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:78: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:78: error: template argument 1 is invalid ./boost/ratio.hpp:78: error: template argument 2 is invalid ./boost/ratio.hpp:78: error: invalid type in declaration before ';' token ./boost/ratio.hpp:79: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:79: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:79: error: template argument 1 is invalid ./boost/ratio.hpp:79: error: template argument 2 is invalid ./boost/ratio.hpp:79: error: invalid type in declaration before ';' token ./boost/ratio.hpp:80: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:80: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:80: error: template argument 1 is invalid ./boost/ratio.hpp:80: error: template argument 2 is invalid ./boost/ratio.hpp:80: error: invalid type in declaration before ';' token ./boost/ratio.hpp:81: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:81: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:81: error: template argument 1 is invalid ./boost/ratio.hpp:81: error: template argument 2 is invalid ./boost/ratio.hpp:81: error: invalid type in declaration before ';' token ./boost/ratio.hpp:131: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:132: error: 'boost::detail::ll_add<X, Y, 1ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:151: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:152: error: 'boost::detail::ll_add<X, Y, -0x000000001ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:167: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:168: error: 'boost::detail::ll_sub<X, Y, 1ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:187: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:188: error: 'boost::detail::ll_sub<X, Y, -0x000000001ll>::max' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:200: error: a function call cannot appear in a constant-expression ./boost/ratio.hpp:201: error: 'boost::detail::ll_mul<X, Y>::min' cannot be initialized by a non-constant expression when being declared ./boost/ratio.hpp:202: error: 'boost::detail::ll_mul<X, Y>::max' cannot be initialized by a non-constant expression when being declared In file included from libs\chrono\src\chrono.cpp:13: ./boost/chrono/chrono.hpp:945: error: a function call cannot appear in a constant-expression ./boost/chrono/chrono.hpp:945: error: a function call cannot appear in a constant-expression ./boost/chrono/chrono.hpp:945: error: template argument 1 is invalid ./boost/chrono/chrono.hpp:945: error: template argument 2 is invalid ./boost/chrono/chrono.hpp:945: error: template argument 2 is invalid ./boost/chrono/chrono.hpp:946: error: typedef name may not be a nested-name-specifier ./boost/chrono/chrono.hpp:946: error: expected ';' before 'rep' ./boost/chrono/chrono.hpp:947: error: typedef name may not be a nested-name-specifier ./boost/chrono/chrono.hpp:947: error: expected ';' before 'period' In file included from libs\chrono\src\chrono.cpp:27: libs\chrono\src\/win/chrono.cpp:34: error: 'monotonic_clock' has not been declared libs\chrono\src\/win/chrono.cpp:34: error: expected constructor, destructor, or type conversion before 'monotonic_clock' libs\chrono\src\/win/chrono.cpp:112: error: expected '}' at end of input libs\chrono\src\/win/chrono.cpp:112: error: expected '}' at end of input libs\chrono\src\/win/chrono.cpp:26: warning: '<unnamed>::nanosecs_per_tic' defined but not used ./boost/system/error_code.hpp:208: warning: 'boost::system::system_category' defined but not used ./boost/system/error_code.hpp:209: warning: 'boost::system::generic_category' defined but not used ./boost/system/error_code.hpp:214: warning: 'boost::system::posix_category' defined but not used ./boost/system/error_code.hpp:215: warning: 'boost::system::errno_ecat' defined but not used ./boost/system/error_code.hpp:216: warning: 'boost::system::native_ecat' defined but not used -----Original Message----- From: Tan, Tom (Shanghai) Sent: 2009-12-09 13:41 To: 'boost-users(a)lists.boost.org' Cc: 'vicente.botet(a)wanadoo.fr' Subject: RE: [chrono] New Features + Bug fixes + Updated + documentation >Date: Tue, 8 Dec 2009 23:46:18 +0100 >From: "vicente.botet" <vicente.botet(a)wanadoo.fr> Hi, > >I'm pleased to annonce the new version of the Boost.Chrono library. Even if the library is not yet ready for review I wanted to share it with you. >For the moment I'm not able to test it on Windows and Mac platforms. >Could you check if there are some regressions on Windows or on Mac platforms? Thanks for continuing this library, I've using Beman's version from the sandbox mainly for the process_timer class for benchmarking code efficiency. I just copied your code from the sandbox and compiled it against the latest boost trunk version with VC++10 on WinXP sp3, and received several occurrences of " error C3861: 'INTMAX_C': identifier not found " among others as attached. There seems to be missing some macro guards that could guarantee a correct import of 'INTMAX_C' from boost/cstdint.hpp.

1 0

Re: [Boost-users] [chrono] New Features + Bug fixes + Updated + documentation
by Tan, Tom (Shanghai) 09 Dec '09

09 Dec '09

>Date: Tue, 8 Dec 2009 23:46:18 +0100 >From: "vicente.botet" <vicente.botet(a)wanadoo.fr> >Hi, > >I'm pleased to annonce the new version of the Boost.Chrono library. Even if the library is not yet ready for review I wanted to share it with you. >For the moment I'm not able to test it on Windows and Mac platforms. >Could you check if there are some regressions on Windows or on Mac platforms? Thanks for continuing this library, I've using Beman's version from the sandbox mainly for the process_timer class for benchmarking code efficiency. I just copied your code from the sandbox and compiled it against the latest boost trunk version with VC++10 on WinXP sp3, and received several occurrences of " error C3861: 'INTMAX_C': identifier not found " among others as attached. There seems to be missing some macro guards that could guarantee a correct import of 'INTMAX_C' from boost/cstdint.hpp.

1 0

[thread] variables in thread examples require 'volatile'?
by Gabriel Redner 09 Dec '09

09 Dec '09

Dear Boosters, I'm involved in a bit of a dispute in which a colleague is claiming that 'volatile' is necessary to make certain synchronization patterns correct. As part of my response I pointed out that the boost.thread examples don't use it, but he maintains his position - saying that the examples are flawed. I'm frankly somewhat out of my element here, and I'd like to get input from people who have presumably thought about this stuff a good deal. The example in question is here, under "synopsis": http://www.boost.org/doc/libs/1_41_0/doc/html/thread/synchronization.html#t… The claim is that 'volatile' is needed on the boolean, otherwise the compiler might cache the boolean in a register, and the loop would never exit. He cites for support two articles: http://www.ddj.com/cpp/184403766 https://www.securecoding.cert.org/confluence/display/seccode/DCL17-C.+Bewar… Who's right? Thanks, -Gabe

7 8

Boost.Interfaces
by Jerry Jeremiah 08 Dec '09

08 Dec '09

Hello, I was looking at the Go language that Google just announced and I was thinking that these "interfaces" were cool. So I found these emails from the Boost users group from 2008: http://archives.free.net.ph/message/20080120.235150.027a4293.en.html http://archives.free.net.ph/message/20080201.165555.eb39994f.en.html It sounds like Jonathon intended to submit a proposal for his library in 2008 but I can't find anything about what happened after that. All I have is http://www.coderage.com/interfaces/ which was last updated 2005. I tried emailing him directly via the email address on that page but there was no answer. Does anyone know if there is a newer version than the 2005 zip file on that page? His Boost user list emails imply that there is one with changes in 2008 and that it was going to be submitted for review so if someone could point me in the right direction I would appreciate it. Jerry

1 0

usage of bcp
by Geoff Hilton 08 Dec '09

08 Dec '09

Hello, I've been reconsidering the use of bcp to import boost code into a public-facing portion of our api for intrusive_ptr, I've read the documentation somewhat, and tried using the command as follows: C:\Program Files\boost\boost_1_41_0\>bcp intrusive_ptr ../../intrusive_ptr This seems to fail as it brings up the usage screen instead of producing anything useful, how can I get it to work correctly? even going into the boost subdirectory and pointing to a destination of /int_ptr gave the same result. Also, I read about a way to rename the namespaces/defines in boost to limit/prevent clashing with client code, how do I go about triggering this? Thanks very much, Geoff

3 6

Newbie question
by Vadim Ryvchin 08 Dec '09

08 Dec '09

Hello, I have a problem with interruption of threads. I have one function that I want to run in two different threads with different parameters. When one of the function's instances finishes it stops the other instance. I can't change the function's code, but I can write wrapper to it. My problem is in stopping the other thread. Using timed_join I find which thread is finished, but I can't find a good solution for stopping the second one. How should I use interrupt method correctly or suggest me for correct thread stopping function. BTW, I can't just leave the other thread to run, it's very high CPU consumer. Thank you all.

4 10

Re: [Boost-users] thread_group::interrupt_all is not reliable
by Stonewall Ballard 08 Dec '09

08 Dec '09

I think I found the cause of this problem. It seems that the caller of interrupt_all should be holding the mutex associated with the condition on which the threads are waiting. This gave me the clue to try that: <http://www.opengroup.org/onlinepubs/009695399/functions/pthread_cond_broadc…> > The pthread_cond_broadcast() or pthread_cond_signal() functions may be called by a thread whether or not it currently owns the mutex that threads calling pthread_cond_wait() or pthread_cond_timedwait() have associated with the condition variable during their waits; however, if predictable scheduling behavior is required, then that mutex shall be locked by the thread calling pthread_cond_broadcast() or pthread_cond_signal(). thread::interrupt() calls pthread_cond_broadcast in pthread/thread.cpp. Although "predictable scheduling" doesn't seem like it should include a failure to wake up, taking the mutex around the call to thread_pool::interrupt_all() appears to be 100% reliable. I can patch my app to do that, but I don't think there's a general solution. The documentation should include a note that thread::interrupt() isn't reliable unless the caller is holding the mutex associated with the condition variable on which the interrupted thread is waiting. Of course, this could be a bug in the OS X pthreads implementation as well. - Stoney > I've discovered that under circumstances apparently related to timing > and load, sending interrupt_all to a thread_group when all the threads > are waiting on a boost::condition_variable leaves one thread waiting > about 1/3 of the time. This is with boost 1_40_0 running on Mac OS X > 10.6.2, with 32-bit boost libraries. Boost uses the posix thread > system here. > I boiled my app down to some test code that runs as a command-line > app. It's a bit longer than I'd like, but this configuration seems to > be necessary to invoke the problem. The test uses a queue to pass > "tasks" from the main thread to worker threads, and another queue to > pass "results" back to the main thread. The problem is most apparent > when all the tasks are finished and the queue empties, so that all the > worker threads are waiting on the input queue when the main thread > sends interrupt_all. > > I've looked at the waiting thread in a debugger when this happens, and > found that it has been interrupted, but is still waiting on the > condition. It looks like it just got missed by the interrupt_all. This > is more likely to happen when there are a lot of worker threads (16, > or one per core in my testing). > > The test code is parked at <http://sb.org/ThreadTest.zip>, 20KB. It's > an XCode 3.2 project, but the five source files could be readily > compiled and run in any Unix environment. > > I don't see any errors in the code that could cause these failures. > There is a work-around, which is to interrupt the waiting thread > again. This required a modified version of thread_group so I could do > a timed_join_all on it. > > I welcome any suggestions about what could be wrong here, or ways to > simplify the test to make it more suitable for a bug report. > > - Stoney -- Stonewall Ballard stoney(a)sb.org http://stoney.sb.org/

3 8

feature request: program_options: generate OS dependent options
by Hicham Mouline 08 Dec '09

08 Dec '09

Hello, Following the discussion in http://lists.boost.org/boost-users/2009/12/54327.php, let me then request that the feature be implemented in program_options. The 2 systems that I know a little about are POSIX(thanks Ovanes) and Windows: .POSIX: Typically, the command line would options with the '-' being the delimiter, like for the 'ls' program on a linux system: ls --help .... -a, --all do not ignore entries starting with . -A, --almost-all do not list implied . and .. --author with -l, print the author of each file -b, --escape print octal escapes for nongraphic characters --block-size=SIZE use SIZE-byte blocks --help print this .... .Windows dir /?: Typically, the '/' is the delimiter. ... /B Uses bare format (no heading information or summary). ... So in fact, I have 2 feature requests :-) : 1. Detect automatically the OS platform and the appropriate delimiter ( / or - or -- ) for win or POSIX 2. Detect the special option (help) that dislays the usage, which is /? on windows and --help on POSIX, and treat it symbolically in the user code calling program_options, ie not having to test for the "help" string as shown in the tutorial. I can create the trac tickets if preferred, Regards,

2 2