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[variant] determine if the type is a variant type
by Chris Weed 03 May '06

03 May '06

Hi, Is there a way to do something like is_variant<T>::value to determine if my type T is a variant type? Chris

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boost::multi_index_container different search key type
by bert hubert 03 May '06

03 May '06

Joaquin, list, In one of the last issues of the C/C++ User's Journal, Andrei Alexandrescu described the need for something better than std::map when using expensive keys: Let's start with two examples. The simplest one would involve the often-used map<string, something>: user names and user IDs, stock tickers and stock prices, class names and pointers to functions, words in Proust's opera and their counts...You can easily access the "something" if you have a key in the desired format. The problem is, you might have the key in a different format that forces a conversion. What if, for example, in your high-speed, high-availability, power-hungry, bonus-bringing stock market program, you have securities data come down the wire in raw char* format, but you need to look it up in a map<string, double>? More on http://www.ddj.com/dept/cpp/184402065 - might this be something boost::multi_index_container could be made to do? Not that boost::multi_index_container isn't wonderful enough already! Thanks. -- http://www.PowerDNS.com Open source, database driven DNS Software http://netherlabs.nl Open and Closed source services

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Is this possible with boost::multi_index?
by Jason House 03 May '06

03 May '06

Below is a small piece of code that I can't get to compile. gcc says: error: forward declaration of 'class search_node' Is there a way to get around this, or can I not embed a multi_index_container like that? I'm using boost 1_32_0 and gcc version 4.0.1 The code below is for a node within a search tree. Each node stores a > class search_node{ > int objective_value; // Objective function > position my_position; // Move location for this step in the search > std::list<position> positions_to_visit; // Future moves to consider in search > boost::multi_index_container < > search_node, > indexed_by< > ordered_unique <search_node, position, &search_node::my_position>, > ordered_non_unique<search_node, int, &search_node::objective_value> > > > search_results; > }; ... or am I just going down a wrong path? I'm trying to build a search tree. I know boost::graph exists, but don't know if it'd be more appropriate.

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Boost 1.33.1 build failure
by Paul Melis 03 May '06

03 May '06

I'm trying to build 1.33.1 on an AMD64 system, using bjam 3.1.12 and build command bjam "-sTOOLS=gcc" stage I get a horrible amount of error output which roughly reads Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (and if you don't know what ICU is then you probably don't need it). Jamfile:278: in load-jamfiles *** argument error * rule stage ( name : sources + : requirements * : local-build * ) * called with: ( : /home1/rugrchpc/melis/boost_1_33_1/boost/compatibility/cpp_c_headers/cwchar /home1/rugrchpc/melis/boost_1_33_1/boost/compatibility/cpp_c_h eaders/csignal /home1/rugrchpc/melis/boost_1 [...] 1/rugrchpc/melis/boost_1_33_1/boost/pending/detail/int_iterator.hpp /home1/rugrchpc/melis/boost_1_33_1/boost/pending/detail/property.hpp /home1/rugrchpc/melis /boost_1_33_1/boost/pending/detail/disjoint_sets.hpp : <locate>stage <tree-subdirs>/home1/rugrchpc/melis/boost_1_33_1 <target>all : <suppress>true ) * missing argument name /home1/rugrchpc/melis/boost_1_33_1/tools/build/v1/boost-base.jam:2330:see definition of rule 'stage' being called /home1/rugrchpc/melis/boost_1_33_1/tools/build/v1/bootstrap.jam:21: in boost-build /home1/rugrchpc/melis/boost_1_33_1/boost-build.jam:16: in module scope I've tried looking at the Jamfile and line number mentioned, but I can't figure this stuff out. Any clue what is going on? Paul -- Paul Melis VR Specialist, Center for High-Performance Computing & Visualization, University of Groningen, The Netherlands T: +31 50 363 9298 E: p.e.c.melis(a)rug.nl W: http://www.rug.nl/rc/hpcv/index

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Re: [Boost-users] WG: defining a function<>-object with a returnvalue of the same type (recursive declaration)
by Oliver.Kowalke＠qimonda.com 03 May '06

03 May '06

Hmm - I would use boost::function instead of declaring a function-pointer object by myself. Regards, Oliver >On 5/2/06, Oliver.Kowalke(a)qimonda.com <Oliver.Kowalke(a)qimonda.com> wrote: >> how can I define a function<> object which returns a value of >> the same type: > >This was taken from GotW article 57: >http://www.gotw.ca/gotw//057.htm > > struct FuncPtr_; > typedef FuncPtr_ (*FuncPtr)(); > > struct FuncPtr_ > { > FuncPtr_( FuncPtr pp ) : p( pp ) { } > operator FuncPtr() { return p; } > FuncPtr p; > }; > >Now we can declare, define, and use f() naturally: > > FuncPtr_ f() { return f; } // natural return syntax > > int main() > { > FuncPtr p = f(); // natural usage syntax > p(); > } > >HTH, > >Michael Fawcett >_______________________________________________ >Boost-users mailing list >Boost-users(a)lists.boost.org >http://lists.boost.org/mailman/listinfo.cgi/boost-users

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[BGL] Maxflow alg. - Flow lower bounds and bidirected edges
by Leandro Melo 03 May '06

03 May '06

Hi. Due to the special requirements of boost maxflow algorithms (edmonds-karp and preflow-push), I don't know how the procedure would be for computing maxflow in graph with biderected edges. In other words, graphs that already have edges (u, v) and (v, u) for a few given vertices u and v. In such graphs, it would not be possible for example to set the capacity of reverse edge to 0 (zero). Would the implementation work anyway? Also, is there a way to set lower bounds for the flow of some given edges? Thanks. -- Leandro Terra C. Melo

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recommended way to implement 'getline()'?
by bert hubert 03 May '06

03 May '06

Chris, boost-users, I'm currently considering asio for a project but I have to do a lot of typing to asynchronously read a simple line of text, when I do it like the http server request_parser::consume (via connection::handle_read). Has anybody already written a primitive, 'read_up_to(char delimiter)' or something? If so, I'd love to hear. Thanks! -- http://www.PowerDNS.com Open source, database driven DNS Software http://netherlabs.nl Open and Closed source services

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Vector of Polymorphic Pointers
by Juan Quiroz 03 May '06

03 May '06

I am trying to serialize a vector of polymorphic pointers. My code looks as follows: class ASTNode{ ... protected: vector <ASTNode*> children; string name; string type; private: // Code for serialization friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, unsigned int version) { ar & name; ar & type; ar & children; } } class ASTNode2: public ASTNode{ ... private: // Code for serialization friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, unsigned int version) { // serialize base class information ar & boost::serialization::base_object<ASTNode>(*this); } // End code for serialization } I use the vector "children" to hold pointers to both base and derived objects. I have tried registering the derived classes at the top of the serialize function call, with the use of ar.register(static_cast<ASTNode*>(NULL)). I have also tried using the BOOST_CLASS_EXPORT_GUID macro to register the classes in main. Yet, I still get a unregistered class exception. Any guidance would be greatly appreciated.

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boost.test - post build event in Visual Studio 7.1 is not redirecting output?
by Ed Johnson 03 May '06

03 May '06

Hi, I am a newbie at this, and I've been wrestling with boost auto test for a while now in Visual Studio 2003. Using boost_1_33_1. I am using the auto_unit_test_test_mult1.cpp, auto_unit_test_test_mult2.cpp for testing. They compile fine. I put in the post build event into my project: "$(TargetDir)\$(TargetName).exe" --result_code=no --report_level=no However, when I click 'Debug', VS still pops the output into a cmd window, and that disappears at the end of execution. The output window inside VS reads: Debug 'testhivm.exe': Loaded 'C:\workspace\hivm\trunk\src\test\Debug\testhivm.exe', Symbols loaded. 'testhivm.exe': Loaded 'C:\WINDOWS\system32\ntdll.dll', No symbols loaded. 'testhivm.exe': Loaded 'C:\WINDOWS\system32\kernel32.dll', No symbols loaded. The program '[5848] testhivm.exe: Native' has exited with code 0 (0x0). I've attached my BuildLog below. Thanks in advance for any help, Ed Build Log ------- Build started: Project: testhivm, Configuration: Debug|Win32 ------- Environment Space ALLUSERSPROFILE=C:\Documents and Settings\All Users ANT_HOME=C:\ant APPDATA=C:\Documents and Settings\Administrator\Application Data ArmServerInfo=00010556 CLASSPATH=C:\workspace\EclipseVscb\VCB\libraries\jars\core\vscb-framework.jar;C:\Program Files\Java\jre1.5.0_06\lib\ext\QTJava.zip CommonProgramFiles=C:\Program Files\Common Files COMPUTERNAME=SFJK39 ComSpec=C:\WINDOWS\system32\cmd.exe FP_NO_HOST_CHECK=NO HOMEDRIVE=C: HOMEPATH=\Documents and Settings\Administrator INCLUDE=C:\cppunit-1.11.4\include;C:\Boost\include\boost-1_33_1;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\prerelease;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include;C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\include JAVA_HOME=C:\Sun\AppServer\jdk LIB=C:\Boost\lib;C:\cppunit-1.11.4\lib;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\lib;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\lib;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\lib\prerelease;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\lib;C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\lib LIBPATH=C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322 LOGONSERVER=\\SFJK39 NB_HOME=C:\Documents and Settings\Administrator\.netbeans NUMBER_OF_PROCESSORS=1 OS=Windows_NT Path=C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\bin;C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\Tools\bin\prerelease;C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\Tools\bin;C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\tools;C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\ide;C:\Program Files\HTML Help Workshop\;C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\bin;C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322;C:\Perl\bin\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\PROGRA~1\ULTRAE~1;C:\Sun\AppServer\jdk\bin;C:\cygwin\bin;C:\mico\idl;C:\mico\libs;C:\Program Files\Common Files\GTK\2.0\bin PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.PL;.pyo;.pyc;.pyw;.py PROCESSOR_ARCHITECTURE=x86 PROCESSOR_IDENTIFIER=x86 Family 6 Model 9 Stepping 5, GenuineIntel PROCESSOR_LEVEL=6 PROCESSOR_REVISION=0905 ProgramFiles=C:\Program Files QTJAVA=C:\Program Files\Java\jre1.5.0_06\lib\ext\QTJava.zip SESSIONNAME=Console SystemDrive=C: SystemRoot=C:\WINDOWS TEMP=C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp TMP=C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp USERDOMAIN=SFJK39 USERNAME=Administrator USERPROFILE=C:\Documents and Settings\Administrator VS71COMNTOOLS=C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\Tools\ windir=C:\WINDOWS _ACP_ATLPROV=C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\bin\ATLPROV.DLL _ACP_INCLUDE=C:\Boost\include\boost-1_33_1;C:\cppunit-1.11.4\include;C:\Boost\include\boost-1_33_1;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\prerelease;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include;C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\include _ACP_LIB=C:\Boost\lib;C:\cppunit-1.11.4\lib;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\lib;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\lib;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\lib\prerelease;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\lib;C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\lib;C:\Boost\include\boost-1_33_1;C:\cppunit-1.11.4\include;C:\Boost\include\boost-1_33_1;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\prerelease;C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include;C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\include _ACP_PATH=C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\bin;C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\Tools\bin\prerelease;C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\Tools\bin;C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\tools;C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\ide;C:\Program Files\HTML Help Workshop\;C:\Program Files\Microsoft Visual Studio .NET 2003\SDK\v1.1\bin;C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322;C:\Perl\bin\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\PROGRA~1\ULTRAE~1;C:\Sun\AppServer\jdk\bin;C:\cygwin\bin;C:\mico\idl;C:\mico\libs;C:\Program Files\Common Files\GTK\2.0\bin Command Lines Creating temporary file "c:\workspace\hivm\trunk\src\test\Debug\RSP0002A8.rsp" with contents [ /Od /I "C:\Boost\include\boost-1_33_1" /D "TESTING" /D "_MBCS" /Gm /EHsc /RTC1 /MTd /GR /Fo"Debug/" /Fd"Debug/vc70.pdb" /W3 /c /Wp64 /ZI /Gd .\auto_unit_test_test_mult1.cpp .\auto_unit_test_test_mult2.cpp ] Creating command line "cl.exe @c:\workspace\hivm\trunk\src\test\Debug\RSP0002A8.rsp /nologo" Creating temporary file "c:\workspace\hivm\trunk\src\test\Debug\RSP0002A9.rsp" with contents [ /OUT:"Debug/testhivm.exe" /INCREMENTAL /NOLOGO /LIBPATH:"C:\Boost\lib" /TLBID:1 /DEBUG /PDB:"Debug/testhivm.pdb" /SUBSYSTEM:CONSOLE /MACHINE:X86 libboost_unit_test_framework-vc71-mt-sgd.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib "\Boost\lib\libboost_unit_test_framework-vc71-mt-sgd.lib" .\Debug\auto_unit_test_test_mult2.obj .\Debug\auto_unit_test_test_mult1.obj ] Creating command line "link.exe @c:\workspace\hivm\trunk\src\test\Debug\RSP0002A9.rsp" Creating temporary file "c:\workspace\hivm\trunk\src\test\Debug\BAT0002AA.bat" with contents [ @echo off "c:\workspace\hivm\trunk\src\test\Debug\\testhivm.exe" --result_code=no --report_level=no if errorlevel 1 goto VCReportError goto VCEnd :VCReportError echo Project : error PRJ0019: A tool returned an error code from "Auto Run Test" exit 1 :VCEnd ] Creating command line "c:\workspace\hivm\trunk\src\test\Debug\BAT0002AA.bat" Output Window Compiling... auto_unit_test_test_mult1.cpp auto_unit_test_test_mult2.cpp Generating Code... Linking... Auto Run Test Running 2 test cases... Results Build log was saved at "file://c:\workspace\hivm\trunk\src\test\Debug\BuildLog.htm" testhivm - 0 error(s), 0 warning(s)

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Viewing datatypes in the watch window
by John Krajewski 02 May '06

02 May '06

Anyone know any good tricks to display Boost types in the watch window in a readable form? VC8 does a good job with the STL containers, but it chokes a bit on Boost containers (especially the BGL) -John

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