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Boost.Log database backends
by Mika Heiskanen 28 Aug '08

28 Aug '08

Hi, Does anyone know if there is a database backend available for Boost.Log? I couldn't find any matches from Google with any sensible keyword combinations. --> Mika Heiskanen / Finnish Meteorological Insititute

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[date_time]: Easter calculation
by Jean-Pierre Bergamin 28 Aug '08

28 Aug '08

Dear Boost-Users Is there a year_based_generator for easter dates somewhere lying around, waiting to be used by others? Thanks James

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Boost at Dev-Cpp 5 (Windows XP)
by Berno Wiegel 28 Aug '08

28 Aug '08

Hello all, I have problems with installing Boost. I downloaded boost_1_36_0.zip and extract it to c:\boost\. After that I downloaded boost-jam-3.1.16-1-ntx86(2).zip and extract bjam.exe to c:\boost\boost_1_36_0\. Now I start cmd and goes to c:\boost\boost_1_36_0\! There I execut bjam with following parameters bjam.exe "-sMINGW_ROOT_DIRECTORY=C:\Dev-Cpp" "-sTOOLS=mingw" install This is my Console: C:\BOOST\boost_1_36_0>bjam.exe "-sMINGW_ROOT_DIRECTORY=C:\Dev-Cpp" "-sTOOLS=min w" install warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. 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 Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (don't panic: this is a strictly optional feature). warning: No toolsets are configured. warning: Configuring default toolset "msvc". warning: If the default is wrong, your build may not work correctly. warning: Use the "--toolset=xxxxx" option to override our guess. warning: For more configuration options, please consult warning: http://boost.org/boost-build2/doc/html/bbv2/advanced/configuration.htm C:/BOOST/boost_1_36_0/tools/build/v2/tools\msvc.jam:320: in configure-really *** argument error * rule path.make ( native ) * called with: ( ) * missing argument native C:/BOOST/boost_1_36_0/tools/build/v2/util\path.jam:44:see definition of rule 'm ke' being called C:/BOOST/boost_1_36_0/tools/build/v2/tools\msvc.jam:172: in configure C:/BOOST/boost_1_36_0/tools/build/v2/tools\msvc.jam:145: in msvc.init C:/BOOST/boost_1_36_0/tools/build/v2/build\toolset.jam:38: in toolset.using C:/BOOST/boost_1_36_0/tools/build/v2\build-system.jam:553: in load C:\BOOST\boost_1_36_0\tools\build\v2/kernel\modules.jam:281: in import C:\BOOST\boost_1_36_0\tools\build\v2/kernel/bootstrap.jam:128: in boost-build C:\BOOST\boost_1_36_0\boost-build.jam:16: in module scope C:\BOOST\boost_1_36_0> I followed this guide (http://wagjo.com/index.php?id=27) It is espacially for Dev-Cpp users, but ther is no installation. I dont know what to do. Please help me.

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Simply including boost/bind.hpp causes compilation error
by Ken Smith 28 Aug '08

28 Aug '08

Here is my environment. % g++ -v Using built-in specs. Target: i686-apple-darwin9 Configured with: /var/tmp/gcc/gcc-5483~1/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=i686-apple-darwin9 --with-arch=apple --with-tune=generic --host=i686-apple-darwin9 --target=i686-apple-darwin9 Thread model: posix gcc version 4.0.1 (Apple Inc. build 5483) Boost 1.35.0 (also produced same issue with Boost 1.34.1) Here is the code. 1 #include <boost/lambda/lambda.hpp> 2 #include <boost/lambda/construct.hpp> 3 #if defined(INCLUDE_BOOST_BIND) 4 # include <boost/bind.hpp> 5 #endif 6 #include <iostream> 7 #include <iterator> 8 #include <algorithm> 30 31 int main() 32 { 33 using namespace std; 34 using namespace boost::lambda; 35 36 typedef std::istream_iterator<int> in; 37 std::for_each(in(std::cin), in(), std::cout << (_1 * 3) << " " ); 76 } (The astute reader will note discontinuity in the line numbering. This is a playground for my exploration with boost. All elided lines are #if 0'ed. Here is the compile command line and the compilation error, both edited for clarity. g++ -c -g -Wall -fexceptions -DINCLUDE_BOOST_BIND -I/path/to/boost-1.35.0/include main.cpp -o main.o main.cpp: In function 'int main()': main.cpp:37: error: '_1' was not declared in this scope I have seen these related articles from the archives of this list but none of the suggestions eliminated the error. I added the inclusion of boost/lambda/construct.hpp per one of the suggestions there. Its inclusion or exclusion doesn't change the behavior. http://thread.gmane.org/gmane.comp.lib.boost.user/35128 http://thread.gmane.org/gmane.comp.lib.boost.user/16630 http://thread.gmane.org/gmane.comp.lib.boost.user/16887 As you may imagine, the elided (and commented out) lines contain actual uses of boost/bind.hpp but it is a mystery to me that simple inclusion of a header file would cause otherwise working code to stop compiling. This compile command (same as above but with -D removed): g++ -c -g -Wall -fexceptions -I/path/to/boost-1.35.0/include main.cpp -o main.o runs to completion and the subsequent link is successful. Any ideas? Thanks in advance, Ken

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[filesystem] Should fstream really 'force' in+out mode?
by Sachin Garg 27 Aug '08

27 Aug '08

I want to open a read only file in ios::in mode using fstream but its open forces in+out mode, causing my open to fail when it could have succeeded. In boost::filesystem::fstream::open, the file open mode is modified to mode | std::ios_base::in | std::ios_base::out Is this really necessary or can this be changed in future? Atleast with MSVC 9.0, std::fstream isn't forcing such behavior. SG

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[program_options] format_paragraph chops words
by Soren Soe 27 Aug '08

27 Aug '08

Hi, I have run into a problem with the program_options library chopping words when it formats help messages. I have created a small code fragment that will duplicate the problem: int main() { std::string p = "\n1234 6789 1234 6789 1234 6789 1234"; format_description(std::cout, p, 20, 44); return 0; } Results in this message: 1234 6789 1234 6789 123 4 6789 1234 In case formatting is not preserved, the 3'rd instance of '1234' is chopped into '123' with '4' on the next line. I think there might be a bug in format_paragraph in the block that is supposed to prevent word chopping. Specifically, this piece of code: // is last_space within the second half ot the // current line if ((unsigned)distance(last_space, line_end) < (line_length - indent) / 2) { line_end = last_space; } should probably not subtract 'indent' from 'line_length' since this was already done at the very beginning of the function. Thanks, Soren Soe. This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately.

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[range] STL algorithm wrappers accepting range?
by Nat Goodspeed 27 Aug '08

27 Aug '08

Apologies if I'm overlooking something obvious, or if this is a FAQ. Has anyone published a suite of wrappers for common STL algorithms that accept Boost.Range instances instead of iterator pairs? Or must we each write our own? Seems like redundant effort...

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[graph] [serialization] loading adjacency_list
by Mojmir Svoboda 27 Aug '08

27 Aug '08

hello, i have 1.36.0 now and i have troubles serializing adjacency list. graph itself saves okay in whatever oarchive and looks okay, but when loading graph, his properties are not set.. in fact defaults are used instead what serialization is trying to load. is there something that changed from 1.35.0 and 1.36.0 in this area? my (uneducated!) guess is that the serialization loads data into temporary that is discarded afterwards. i traced it to file adj_list_serialize.hpp around line 90: now i want the line ar >> serialization::make_nvp("vertex_property", get(vertex_all_t(), graph, v)); to be transformed into form: something & vp = get(vertex_all_t(), graph, v); ar >> serialization::make_nvp("vertex_property", vp); at least for debugging purposes.. i'm wondering that this "something" could be.. i tried property_map<...>::type etc, but failed ultimately. the same apply to edge: what is the return type of get(edge_all... when my graph is defined by: typedef boost::adjacency_list< boost::vecS, boost::vecS, boost::undirectedS, VertexProp, boost::property<boost::edge_index_t, uint16_t, EdgeProp> > T_Graph; many thanks, mojmir // please excuse incomplete information, i'm under pressure :/

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base64_from_binary Q
by Terdale, Shantibhushan 27 Aug '08

27 Aug '08

I am using this sample to prove myself that base64_from_binary and binary_from_base64 can be used in my app. But I am having little problem and not able to understand whats missing Here is the sample #include "boost/archive/iterators/base64_from_binary.hpp" #include "boost/archive/iterators/binary_from_base64.hpp" #include "boost/archive/iterators/transform_width.hpp" #include <string> #include <iostream> using namespace std; using namespace boost::archive::iterators; typedef base64_from_binary< transform_width<std::string::iterator, 6, sizeof(char) * 8> > base64_t; typedef transform_width< binary_from_base64<std::string::iterator>, sizeof(char) * 8, 6 > binary_t; int main() { string str = "Hello, world!"; cout << str << endl; string enc(base64_t(str.begin()), base64_t(str.end())); // Problem here. It works when I specify "str.end()-1" instead of "str.end()" but I loose last character after decoding. cout << enc << endl; string dec(binary_t(enc.begin()), binary_t(enc.end())); cout << dec << endl; return 0; } Will appreciate any help. I tried std::copy as well and have same problem.

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question about time_facet and date/time formatting
by Axel 27 Aug '08

27 Aug '08

Hello Following the documentation, the time_facet::put function take 3 common parameters : "an iterator pointing to the next item in the stream, an ios_base object, and the fill character.".But this is not clear for me, i m totally new to facets. I m using it like that and it works well : stringstream log_stream ; ptime time = second_clock::local_time() ; time_facet facet("%Y-%m-%d %H:%M:%S") ; facet.put(log_stream, log_stream, ' ' , time) ; cout << log_stream.str() ; But I don't understand WHY it works and I wonder some things : What does mean the "iterator to the next item" from the documentation since I consider the target as an input stream ? Why use the same object for the "ios_base object" parameter ? This means I could use a different stream, but what could be the utility of such an usage of put() ? Finally, what is the use of the "fill character" ? Thanks in advance.

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