June 2011 - Boost-users - lists.boost.org

bjam how to access python version, when installing
by Avi Bahra 22 Jun '11

22 Jun '11

In my site-config.jam file I have: using python : 2.5 # version : # cmd-or-prefix : # includes : # libraries : # condition ; I want to install my boost python extension, into site-packages. How can i access the python version defined in "using python" ? There does not seem to be any reference to this in the doc's so i'm not sure how common a request this is, or if there are better alternatives. Any help appreciated. Best regards, Ta, Avi

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[iostreams] Why can't I use 'stream<file>' to write to a file?
by Wim van der Meer 22 Jun '11

22 Jun '11

Hi, I have started to use the Boost iostreams library in one of my projects. I am using the latest Boost version, 1.46.1 with a 64-bit Linux OS on a x86-64 architecture. When I compile and run the small program below, "HeavyArtillery2.txt" is created, but "HeavyArtillery1.txt" is not, and I don't understand why. Am I missing something obvious? #include <boost/iostreams/stream.hpp> #include <boost/iostreams/device/file.hpp> namespace io = boost::iostreams; int main(int argc, char *argv[]) { io::stream<io::file> out1; out1.open("HeavyArtillery1.txt"); out1 << "Reach at that Arrogance which needs thy harm,\n" "And beat it down before its sins grow worse.\n"; out1.close(); io::stream<io::file_sink> out2; out2.open("HeavyArtillery2.txt"); out2 << "Reach at that Arrogance which needs thy harm,\n" "And beat it down before its sins grow worse.\n"; out2.close(); } -- Wim van der Meer

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Boost Filesystem iterator no_push
by Kiah08 22 Jun '11

22 Jun '11

I am using recursive directory iterator. When I list files and directories, my program terminates on "System Volume Information" on Windows machines. The system folder is inaccessible. I believe I need to implement the no_push() modifier. Could someone explain how to add that to this block of code? --------------------------- void initial_path( const path & directory, bool recurse_into_subdirs = true ) { if(exists(directory)) {directory_iterator end; for(directory_iterator iter(directory) ; iter != end; ++iter) if (is_directory( *iter )) {cout << iter->path() << " (directory)\n"; if( recurse_into_subdirs ) initial_path(*iter); } --------------------------- -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-Filesystem-iterator-no-push-tp3615… Sent from the Boost - Users mailing list archive at Nabble.com.

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BGL: Write graphviz file with invisible edges
by David Doria 22 Jun '11

22 Jun '11

I found out that if you write a graph (.dot) file like this: graph G { 0; 1; 2; 0--1; 1--2 [style=invis]; } graphviz will layout the graph as if it has two edges (0--1, and 1--2), but not display the edge between vertices 1 and 2. This is useful when trying to keep the vertices stationary and show changes to the connectivity. How would I setup the graph in BGL so I could mark particular edges so they will be written with [style=invis]? Thanks, David

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Installing boost.mpi on Cray system
by khaled hamidouche 21 Jun '11

21 Jun '11

Hello I'm trying to install boost and its MPI bindings on a Cray XE6 and this is what I get after adding using mpi ; to user-config.jam: MPI auto-detection failed: unknown wrapper compiler<http://omgili.com/mailinglist/boost-users/lists/boost/org/4BC2BA3E2040204he…> /opt/cray/xt-asyncpe/4.9/bin/CC or MPI auto-detection failed: unknown wrapper compiler mpic++ (mpic++ -bash: mpic++: command not found) If I understand correctly boost only checks for mpicc and related executables and also tries mpirun. None of these are supposed to be used on an XE6 The compiler commands to use are cc, CC and ftn. More information for I think the same machine: https://www.nersc.gov/users/getting-started/<http://www.csc.fi/english/pages/louhi_guide/program_development/compilers/i…> these compiler cc, CC and ftn are using directly to compile an MPI program (don't use mpiCC to compile) Actually CC is using the GNU compiler module switch PrgEnv-pgi PrgEnv-gnu CC --version /opt/cray/xt-asyncpe/4.9/bin/CC: INFO: Compiling with XTPE_COMPILE_TARGET=native. g++ (GCC) 4.5.2 20101216 (Cray Inc.) I need to build boost mpi with this compiler (CC). How can I make bjam do that?? Thank you K.H

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mpl pow10 sequence
by Olaf Peter 21 Jun '11

21 Jun '11

Hi, my first steps in mpl :>) I try to build a sequence/vector of pow10 sequence of integers and access them by index at runtime. See the last line of a concept usage. The range of exponents are in range [0..7] so the mpl::vector7 would be appropriate. Anyway, I don't get a compile able version using mpl's next, fold etc. How can I get this? Thanks, Olaf

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How to bjam program_options correctly for VC++ 9 (Visual Studio 2008)?
by Petr Přikryl 21 Jun '11

21 Jun '11

Hi, I am very new to this mailing list. I tried to search the archive, but I did not find the answer... So far, I do use only BOOST_FOREACH and regex from the boost in our application. However, I am planning to extend the usage. My question is how to use the bjam correctly to compile a module for Microsoft Windows using the VC++ 9 (Visual Studio 2008)? My boost bakground... My previous experience is only with compilation of the regex. However, there are makefiles prepared for compilation by the Visual Studio C++ versions (like vc9.mak). It seems to me that bjam is prefered, and should be used whenever possible. I did download the boost_1_46_1.zip and unzipped it to d:usrboost_1_46_1 directory. Then I have followed the advice from somwhere in the doc and launched the d:usrboost_1_46_1bootstrap.bat The compilation went successfully and the d:usrboost_1_46_1bjam.exe appeared there. I did move it to the d:usrbin -- that directory is in my path. Now, I would like to know how and from where I should launch the bjam.exe to obtain the compiled libraries. Actually, I did some moves and I got some libs; however, I would like to better understand what I am doing. For example, I did compile the regex. But the libraries had the _1_46_1 in the name while the linker later expected to find only _1_46 in the name. I am afraid I do not understand more details. I tried some tutorials, but they are or too focused on something or too general (too much info). Please, can you focus on what exactly should be done for the program_options and for the regex? Thank you, Petr

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Executable wrapped into another one: how to pass streams instead of real files?
by Alessandro Candini 21 Jun '11

21 Jun '11

I give you a simplified example to explain what I would like to do. I have the following code, which I cannot modify (hello.cpp): |#include <iostream> #include <fstream> using namespace std; int main( int argc, char *argv[] ) { string line; ifstream f( argv[1] ); while(!f.eof()) { getline(f, line); cout << line << endl; } return 0; } Launch example: ||caneta@host ~ $ ./hello myfile.txt 1 - This is 2 - a test 3 - file. I have a wrapper program which I need to modify: ||#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <iostream> #include <fstream> #include <sstream> using namespace std; int main () { int ret; ret = execl ("./hello", "./hello", "myfile.txt", (char *)0); return 0; }| In this way it works perfectly...but how can I modify it in order to use a stream or a string inside the wrapper program, instead of using a file name? I would like to have something like: |#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <iostream> #include <fstream> #include <sstream> using namespace std; int main () { int ret; ifstream inputFile; inputFile << "1 - This is" << endl; inputFile << "2 - a test" << endl; inputFile << "3 - file." << endl; ret = execl ("./hello", "./hello", inputFile, (char *)0); return 0; }| This last example, of course, doesn't work...how can I modify it in order to make it work? Remember that I cannot modify hello.cpp... Can the Boost.iostreams help me? Thanks in advance. -- Alessandro Candini MEEO S.r.l. Via Saragat 9 I-44122 Ferrara, Italy Tel: +39 0532 1861501 Fax: +39 0532 1861637 http://www.meeo.it ======================================== "ATTENZIONE:le informazioni contenute in questo messaggio sono da considerarsi confidenziali ed il loro utilizzo è riservato unicamente al destinatario sopra indicato. Chi dovesse ricevere questo messaggio per errore è tenuto ad informare il mittente ed a rimuoverlo definitivamente da ogni supporto elettronico o cartaceo." "WARNING:This message contains confidential and/or proprietary information which may be subject to privilege or immunity and which is intended for use of its addressee only. Should you receive this message in error, you are kindly requested to inform the sender and to definitively remove it from any paper or electronic format."

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how does one build documentation for one library
by Robert Ramey 21 Jun '11

21 Jun '11

I'm interested in trying out quickbook documentation build system. To this I have studied this page. https://svn.boost.org/trac/boost/wiki/BoostDocs/GettingStarted#Howtotestyou… I've built quickbook and downloaded the other tools. I would like to test the system on one library and not occupy my system for hours trying to do this. The section How to test your build setup says: There is a set of test documentation that covers all the tools that can be used in the boost-root/doc/test directory. Building this requires quickbook, doxygen, latex, dvips and ps as well as the basic Boostbook setup. But it doesn't say what command to invoke nor what directory to invoke it from. What I would like to do is: a) cd to the library I'm interested int. eg cd c:/boostrelease/libs/fusion b) bjam html and have it build a subdirectory html (or maybe doc/html) with all the html files in it. How can I do this? Robert Ramey

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lexical_cast and float
by Claude 20 Jun '11

20 Jun '11

Hi! I use this code to control if a sdt::string is a "float" value: string value("3.14"); try { lexical_cast<float>(value); } catch(bad_lexical_cast& ) { cout<<value<<" is not a float number\n"; } I always obtain a bad_lexical_cast exception. Why? -- View this message in context: http://boost.2283326.n4.nabble.com/lexical-cast-and-float-tp3609634p3609634… Sent from the Boost - Users mailing list archive at Nabble.com.

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