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boost bind question, can it create a functor with more arguments than needed
by gast 128 15 Nov '04

15 Nov '04

Dear all, Probably this is something one does not encounter often, but I have here an interface which expects more arguments than needed, e.g.: void SomeInterface(boost::function<void (Arg1, Arg2)> fcCallback) {} now I have another functor like: boost::function<void (Arg1)> fc; I want fc apply to SomeInterface, and it only needs to fill in argument1. So I need something like boost::bind(fc, _1, _2) to get it compilable for SomeInterface, only bind now thinks that fc has a prototype of two arguments. Is there a way to tell bind to ignore argument2 (without explicit write a functor)? wkr, me _________________________________________________________________ MSN Search, for accurate results! http://search.msn.nl

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boost::xtime nsec ?
by Leon Mergen 15 Nov '04

15 Nov '04

Hello, Little quick question, it isn't documented anywhere : The struct boost::xtime has a member called 'nsec' - what amount of time is this ? Thanks in advance! Leon Mergen

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Can you use a template class to store data in a vertex of a boost graph?
by Stephen torri 15 Nov '04

15 Nov '04

Has anyone used a template class to store information in a vertex of a boost graph? I am looking for a way in which to store a variety of data types in a boost graph. So that if a sample class like following: template <typename T> class Data { ... }; It can be used to data such that a Data<int> and a Data<float> can be stored at a vertex in the graph. Is what I desire possible? Stephen

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Re: [Boost-users] Newbie install on Mac: where are graph
by Mike Fuller 14 Nov '04

14 Nov '04

John Maddock wrote: > The Boost Graph library consists of headers only, there are no separate > sources to compile, and hence no libraries to install for it, and Meredith Patterson wrote: > Take a look in /usr/local/include/graph -- you should see a wealth of > header files, comprising the entire BGL. It's like the STL that way. Ahhhh! Thank you very much! Mike > Mike Fuller wrote: >> Is the graph library not installed as part of the standard >> installation? Perhaps the problem is related to boost_python? Or are >> they installed somewhere else? Is there a separate procedure I'm >> missing?

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Newbie install on Mac: where are graph libs?
by Mike Fuller 14 Nov '04

14 Nov '04

I 'm having trouble installing the Boost graph libraries (release: boost_1_31_0) on my Macintosh laptop. I'm running Mac OS 10.3.6 on an iBook G4 (933 MHz), with 640 MB SDRAM and a 60 GB drive. gcc version 3.3 20030304 (Apple Computer, Inc. build 1666). Darwin Kernel Version 7.6.0. I followed the installation instructions provided in the html document: Getting Started (http://www.boost.org/more/getting_started.html) The procedure seemed to work smoothly: * The build script for Boost.Jam properly recognized the "darwin" toolset. * The command: bjam "-sTOOLS=gcc" install properly initiated the install script. * boost_python was not installed, but I didn't see this as a big deal since I don't use Python. However, when the build was complete, I could not locate the Boost graph libraries. I could only find eight types of Boost libraries in /usr/local/lib. (For each type, there are eight associated libraries, as is described in Getting Started.) I do not see the graph libraries. The boost libraries found after the build in /usr/local/lib include static and dynamic forms of: libboost_date_time-1_31 libboost_filesystem-1_31 libboost_prg_exec_monitor-1_31 libboost_regex-1_31 libboost_signals-1_31 libboost_test_exec_monitor-1_31 libboost_thread-1_31 libboost_unit_test_framework-1_31 Is the graph library not installed as part of the standard installation? Perhaps the problem is related to boost_python? Or are they installed somewhere else? Is there a separate procedure I'm missing? Thanks. I am not a UNIX super-user, and I don't have a lot of experience installing libraries. Please reply to mmfuller(a)tiem.utk.edu. Mike Fuller ____________________________________ Department of Ecology & Evolutionary Biology University of Tennessee, Knoxville

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compact matrix/dense vector product
by Daniel L Elliott 13 Nov '04

13 Nov '04

Hello, I am using the CVS Head version of uBLAS from approximately one month ago with gcc. I get a ton of errors when trying to multiply a dense vector by a compact matrix. This is what my code looks like: la::compressed_matrix<int>* permutationMatrix; template<class T> void Permutation::apply(la::vector<T>& dataPoint){ dataPoint = prod(*permutationMatrix,dataPoint); } What, conceptually, am I doing wrong? If asked, I will happily provide more information. For now, I am trying to keep this email to a reasonable size. Thank you, -- dan ************************** Dan Elliott 402-210-6429 (me) or 402-210-6735 (amy) dan_elliott(a)cox.net **************************

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boost::function and equality operators?
by Alo Sarv 12 Nov '04

12 Nov '04

Hi I was just transforming my event engine from another callback functors lib to boost::function, and discovered that boost::function has explicitly forbidden operator== and operator!=. My question is why is this done, and what could be possible workarounds? Thanks in advance, Alo Sarv. Example: #include <boost/function.hpp> #include <cassert> void foo() {} void bar() {} int main() { // won't compile if these are used in the below asserts // boost::function<void()> f(&foo); // boost::function<void()> g(&bar); // boost::function<void()> h(&foo); // works with raw function pointers void (*f)() = &foo; void (*g)() = &bar; void (*h)() = &foo; assert(f == h); assert(f != g); assert(g != h); }

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New trouble compiling with MS VC6 SP5 and MFC/AFX
by Arno Schäfer 12 Nov '04

12 Nov '04

Hi, if I want use the boost libs in an existing MFC/AFX environment I have a lot of compiling problems, what seems to depend on the order of includes. One problem what I see, but I don't understand, is the following compile error: Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86 Copyright (C) Microsoft Corp 1984-1998. All rights reserved. cl /MDd /W3 /GR /GX /Zi /Od /I ...bunch of includes... /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_SECDLL" /D "_AFXDLL" /D "_ MBCS" /D "_GXDLL" /D "NOMINMAX" /D "_SECNOMSG" /D "_GXNOMSG" /D "_SFLNOMSG" /Fp" D:\temp\debug\GUIClient/Plato.pch" /YX"stdafx.h" /Fo"D:\temp\debug\GUIClient/" / Fd"D:\temp\debug\GUIClient/" /FD /Zm200 /GZ /c "F:\Gui+Client\src\AboutDlg.cpp" AboutDlg.cpp Note: Using precompiled header Automatically linking with RWUXThemeSD.lib ..\..\PlatoServer\Basics\boost\inc\boost/detail/iterator.hpp(326) : error C2039: 'difference_type' : is not a member of 'Iterator' ..\..\..\libs\stingray\objective_studio\include\foundation\Patterns\Iter ator.h(77) : see declaration of 'Iterator' ..\..\PlatoServer\Basics\boost\inc\boost/detail/iterator.hpp(331) : see reference to class template instantiation 'boost::detail::standard_iterator_traits<Iterator>' being compiled ... So it looks like, that the template parameter "Iterator" in "boost::detail::standard_iterator_traits<Iterator>" conflicts with the template class "stingray::foundation::Iterator" in some header files from the GUI control stuff, what was included before the boost header. How is this possible, what has the template parameter "Iterator" in the namespace "boost::detail" to do with the template class "Iterator" in the namespace "stingray::foundation" has anybody an explaination for this? regards Arno

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[boost][boost-users][random] Open bugs
by Cromwell Enage 12 Nov '04

12 Nov '04

Any chance that any of the following bug reports will be resolved before the release? <http://sourceforge.net/tracker/index.php?func=detail&aid=911758&group_id=75…> <http://sourceforge.net/tracker/index.php?func=detail&aid=715667&group_id=75…> <http://sourceforge.net/tracker/index.php?func=detail&aid=652567&group_id=75…> TIA! Cromwell Enage __________________________________ Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com

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Some trouble with "regex_replace()"
by Arno Schäfer 12 Nov '04

12 Nov '04

Hi all, Using "regex_replace(string, pattern, replace_string, flags)" I got some unwished results. I can't find out what flag set I have to use, that the replacement string was taken, as it is. I think this short example should make my problem clear: Replace in a string all occurences of PATH through the actual windows directory: "Actual path: 'PATH'" with Path "D:\temp\rest" leads to the string: "Actual Path: 'D: emp est'" This show, that "\t" and "\r" was interpreted. For me that is an unexspected behaviour, because the replacement is just some string, not more. I understand that the pattern will be interpreted and controlled over the flags, but why the replacement string? Can somebody explain that behaviour and show me a way out? regards Arno

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