October 2007 - Boost-users - lists.boost.org

which libs to link to for serialization?
by Mark Wyszomierski 21 Oct '07

21 Oct '07

Hi, I have an installer for win32 which installs the boost libraries. I'm trying to link to the serialization libraries, and several copies have been created in the boost/lib folder: libboost_serialization-vc80-mt-1_33_1.lib libboost_serialization-vc80-mt-gd-1_33_1.lib libboost_serialization-vc80-mt-s-1_33_1.lib libboost_serialization-vc80-mt-sgd-1_33_1.lib Which version should be linked to when? Right now I'm using a trial and error method to see which one my win32 apps can link to without linking errors. Thanks, Mark

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Parag is your Yaar! :)
by Parag 21 Oct '07

21 Oct '07

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[date_time] Error including posix_time headers using VC80
by Wilson Barbosa 20 Oct '07

20 Oct '07

Hi there, I've got the following error messages when including posix_time.h or posix_time_types.h on a project: ------ Build started: Project: ics99200, Configuration: Debug Win32 ------ Compiling... controle_proc_ora.cpp c:\arquivos de programas\microsoft visual studio 8\vc\platformsdk\include\rpcndr.h(147) : error C2632: 'char' followed by 'int' is illegal c:\arquivos de programas\microsoft visual studio 8\vc\platformsdk\include\rpcndr.h(147) : warning C4091: 'typedef ' : ignored on left of 'unsigned char' when no variable is declared c:\arquivos de programas\microsoft visual studio 8\vc\platformsdk\include\wtypes.h(1075) : error C2371: 'BOOLEAN' : redefinition; different basic types c:\arquivos de programas\microsoft visual studio 8\vc\platformsdk\include\winnt.h(770) : see declaration of 'BOOLEAN' I'm using Visual C++ 8.0 compiler (VS2005 Pro), MS-Windows XP Pro SP2 and the default options on the Boost build. Does anybody have a clue of what is (exactly) happening here and about any solution/workaround for this? TIA, WB::

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[Graph] edge list cache
by Krishna Roskin 20 Oct '07

20 Oct '07

Hello all, I'm working on implicitly defined graphs using the graph boost library. The out_edges function (for example) generates the list of out edges on the fly and returns a shared_container_iterator. Creating this list takes a non-trivial amount of time and so I'd like to cache the result of out_edges so that future calls don't duplicate. But I'm not sure how to do this and still fit within the "BGL way." My first instinct was to add the cache as a member of the graph. But this means that out_edges has to take a non-const reference so that it can update the graph and this causes problems for filtered_graph and reverse_graph. Right now I'm toying with making my cache global and keyed to the address of the graph but this seems inelegant. Anyone have any suggestions? -krish

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[general] bash script to filter compiler output
by Robbie Morrison 20 Oct '07

20 Oct '07

Hi all Postings here often comment on the amount of compiler output generated when using Boost libraries. I found the following script quite useful when trying to track down both bad practice and real errors in my own code. It works something like this: $ callfilter -6 make This script filters the compiler output based on the options -0 thru -7. Option -- has no effect and is provided for typing convenience. Options -5 and -6 are typically the most useful. Some comments at the start of the script provide more information. I find g++ -Weffc++ often rather helpful, but its use definitely requires some form of output screening. Here is the usage message for this script: usage: callfilter [-01234567] <call> modified call with output filtering callfilter -- <call> straight call (provided for convenience) callfilter --help|-h display usage message and quit purpose: append selected filters to build calls to suppress Boost library output additive: 0 2>&1 1 | grep -v 'boost::' | grep -v 'std::tr1::' 2 | grep -v '/include/boost-1_34_1/' | grep -v '/include/c++/4.1.2/tr1/' 4 | grep -v 'instantiated from' examples: $ callfilter -- make $ callfilter -7 g++ -Wall -Weffc++ usingboost.cc -o usingboost If anyone has improvements, let me know. I will endeavor to incorporate these and then repost in a couple of weeks. cheers Robbie Morrison --- [from IMAP client] #! /bin/bash # Copyright: (c) 2007 Robbie Morrison. All rights reserved. # License: Unrestricted reuse in any form, for any purpose. # Version: $Id: callfilter,v 1.7 2007/10/19 11:26:41 robbie Exp $ # Purpose: take a command-line build call and append some # selected 'grep' filters to reduce the amount of output # displayed. A build call could be just 'make' or perhaps # g++ with a string of arguments. The individual filters # are intended to suppress the screenfulls of warnings # generated by Boost library headers, while leaving the # compiler messages that relate more directly to your code. # The ability to mix different combinations of filters is # often useful. The UNIX 'grep' utility does the filtering # and -v is the 'invert-match' option. This script can be # particularly valuable in combination with the '-Weffc++' # option for g++. In fact, the script was developed # because of a comment suggesting such an approach on the # g++ manpage. # # See also: for a more sophisticated approach, # refer to: http://www.bdsoft.com/tools/stlfilt.html # define some suitable filters -- please modify to suit your needs FILTER_0="2>&1" # useful when capturing output FILTER_1="| grep -v 'boost::' | grep -v 'std::tr1::'" FILTER_2="| grep -v '/include/boost-1_34_1/' | grep -v '/include/c++/4.1.2/tr1/'" FILTER_4="| grep -v 'instantiated from'" # preamble SCRIPT=$(basename "$0") # for console reporting # script exit codes E_SUCCESS=0 E_USAGE=2 E_NO_GREP=3 # functions function display_help # using simple echo statements { echo echo " usage: $SCRIPT [-01234567] <call> modified call with output filtering" echo " $SCRIPT -- <call> straight call (provided for convenience)" echo " $SCRIPT --help|-h display usage message and quit" echo " purpose: append selected filters to build calls to suppress Boost library output" echo " additive: 0 $FILTER_0" echo " 1 $FILTER_1" echo " 2 $FILTER_2" echo " 4 $FILTER_4" echo " examples: \$ $SCRIPT -- make" echo " \$ $SCRIPT -7 g++ -Wall -Weffc++ usingboost.cc -o usingboost" echo } function make_filter # with conventional rather than bitwise arithmetic { local base=4 # option range is from 0 to (2 ** base - 1) local num=${opt#-} # strip leading - while [ $base -gt 0 ] do if [ $num -ge $base ] then let "num = num % base" # remainder operator case "$base" in 1) filter="$FILTER_1 $filter" ;; 2) filter="$FILTER_2 $filter" ;; 4) filter="$FILTER_4 $filter" ;; esac fi let "base = base / 2" # divide by two done filter="$FILTER_0 $filter" } # process our part of the command-line case "$1" in --help|--hel|--he|--h|-help|-hel|-he|-h|-\?) display_help exit $E_SUCCESS ;; -[0-7]) opt="$1" shift make_filter ;; --) shift ;; "") echo "$SCRIPT: try --help for usage" exit $E_USAGE ;; esac # confirm that grep is present on the system if [ ! $(which grep) ] then echo "$SCRIPT: required utility not found: grep" echo "$SCRIPT: unable to continue" exit $E_NO_GREP fi # active code echo "$SCRIPT: call : $*" echo "$SCRIPT: filter : $filter" eval "$* $filter" # actual call # housekeeping exit $E_SUCCESS # end of file

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[tuple] easy way to bind to get
by Chris Weed 19 Oct '07

19 Oct '07

Hi, I would like to bind to the boost::get<N> function for use by transform iterator. This is the pseudo code if get worked like a simple function. std::vector<tuple<int,int,float> > v(2); v[0] = tuple<int,int,float>(2,2,2.2f); v[1] = tuple<int,int,float>(3,3,3.3f); std::accumulate( boost::make_transform_iterator( v.begin(), boost::lambda::bind(&boost::get<1>,_1)), boost::make_transform_iterator( v.end(), boost::lambda::bind(&boost::get<1>,_1)), 0); I find bind is difficult to use for functions that deduce template arguments from function arguments. I thought if I changed boost::get<1> -> boost::get<1,tuple<int,int,float> > That didn't work either. Digging through tuple.hpp makes my head spin. Is there an easy way to do this. Thanks, Chris

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Warning binding member functions returning template types on MSVC80
by Josef Grahn 19 Oct '07

19 Oct '07

Hi, Visual Studio 2005 gives me warning C4180 ("qualifier applied to function type has no meaning; ignored") when binding member functions that has a templatized type as return type with boost::bind, but I can't see any reason why it should. The following example reproduces the warning: #include <boost/bind.hpp> template <typename T> struct Foo {}; struct Bar { Foo<void> f() { return Foo<void>(); } int g() { return 0; } }; Foo<void> f() { return Foo<void>(); } int main(int argc, const char **argv) { Bar b; boost::bind(&Bar::f, &b); // Warning C4180 (see below) boost::bind(&Bar::g, &b); // No warning boost::bind(f); // No warning return 0; } So far as I have tested, the program appears to function properly. The full warning is as follows (paths shortened): C:\...\boost/bind.hpp(1575) : warning C4180: qualifier applied to function type has no meaning; ignored C:\...\boost/bind.hpp(1609) : see reference to class template instantiation 'boost::_bi::add_cref<Pm,I>' being compiled with [ Pm=Foo<void> (__thiscall Bar::* )(void), I=1 ] ..\..\..\src\main.cpp(14) : see reference to class template instantiation 'boost::_bi::dm_result<Pm,A1>' being compiled with [ Pm=Foo<void> (__thiscall Bar::* )(void), A1=Bar * ] GCC 4.1.2 on Linux compiles the code without warnings. Any insights are greatly appreciated! Best regards, Josef Grahn

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BGL: Bundled Properties with pointer type
by Benoît Dagon 19 Oct '07

19 Oct '07

Hi all, It's my first time submitting a question on a newsgroup so pardon me if I'm wrong in my way of doing. I have a graph of type BoostGraph_t defined like typedef boost::adjacency_list <vecS, vecS, undirectedS, NodeProperty*, EdgeProperty*> BoostGraph_t; with vertex and edge properties types defined as pointer on the following stuctures struct EdgeProperty { long m_id; double m_length; }; struct NodeProperty { long m_id; }; I'm now trying to use the dijkstra_shortest_paths() function with the edge length as parameter for the weigh_map function argument. But the call to the following function get(&EdgeProperty::m_length, m_graph); returns me the following errors ****** e:\Boost\boost\graph\properties.hpp(337) : error C2825: 'Bundle::*': cannot form a qualified name e:\Boost\boost\graph\properties.hpp(337) : error C2226: syntax error : unexpected type 'Graph' e:\Boost\boost\graph\properties.hpp(337) : error C2334: unexpected token(s) preceding ':'; skipping apparent function body e:\Boost\boost\graph\properties.hpp(342) : error C2825: 'Bundle::*': cannot form a qualified name e:\Boost\boost\graph\properties.hpp(342) : error C2657: '`global namespace'::*' found at the start of a statement (did you forget to specify a type?) e:\Boost\boost\graph\properties.hpp(342) : error C2653: 'operator``global namespace''' : is not a class or namespace name e:\Boost\boost\graph\properties.hpp(342) : error C2501: 'boost::bundle_property_map<Graph,Descriptor,Bundle,T>::pm' : missing storage-class or type specifiers with [ Graph=boost::adjacency_list<boost::vecS,boost::vecS, boost::undirectedS,NodeProperty *,EdgeProperty *>, Descriptor=boost::property_map<boost::adjacency_list<boost::vecS, boost::vecS,boost::undirectedS,NodeProperty *,EdgeProperty *>, double EdgeProperty::* >::descriptor, Bundle=boost::property_map<boost::adjacency_list<boost::vecS, boost::vecS,boost::undirectedS,NodeProperty *,EdgeProperty *>, double EdgeProperty::* >::actual_bundle, T=double ] ****** I know it's working correctly if I use NodeProperty and EdgeProperty for graph template arguments instead of pointers. But I would like to know if it's possible to do it in that way and how would be the correct syntax for the get() to work properly. Many thanks in advance for your help! ~Benoît

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Re: [Boost-users] [fusion] subset view
by dan marsden 19 Oct '07

19 Oct '07

>I would like to make a subset view of the element in a tuple. It >would, for example, give me a view into the first, third, and fifth >element of the tuple. It isn't clear how to do this with the available >views. You could do the following (untested): * Use zip to zip an mpl range of numeric indexes to your sequence * Use filter to extract the positions you want, based on the indices zipped on above * Use transform to remove the position labels so the sequence elements are just your desired data. The above works only if you need const access, as the algorithms return views to const data. If you need non-const data, you can use the corresponding views. The above is somewhat awkward, if there is some criteria other than position index that can be used to extract your elements, you may be able to do a lot better. Or you could choose different data structures to start off with, for example if you really have 2 subsets of elements, sub0 and sub1, and you know they're separate, store them in 2 fusion containers, and when you need to work on the whole, use fusion::join to glue them together. HTH Cheers Dan ___________________________________________________________ Yahoo! Answers - Got a question? Someone out there knows the answer. Try it now. http://uk.answers.yahoo.com/

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sorting an ublas matrix by a certain column
by Alexander Schmolck 19 Oct '07

19 Oct '07

Hi, If I have a boost::numeric::ublas::vector<double> v, I can use the STL's sort and boost::lambda. sort(v.begin(), v.end(), _1<_2); How do I do the same with matrix<double>, using, say column 3 as sort key (i.e. I want to reorder the rows in the matrix by their 3rd entry)? sort(m.begin1(), m.end1(), _1[3]<_2[3]); won't do the trick, and I really have a hard time figuring out what does. In case it's not clear what I want, here's an example: [0,0,1,4 0,0,2,3 0,0,3,2 0,0,4,1] => [0,0,4,1 0,0,3,2 0,0,2,3 0,0,1,4] cheers, 'as

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