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Formal Review: The Spirit Parser Framework.
by John Maddock 14 Oct '02

14 Oct '02

The formal review for the Spirit Parser Framework begins today, and runs until the end of Sunday 20th October. Discussion should take place on the main boost developer list (boost(a)lists.boost.org) please state in your review whether you think the framework should be accepted into boost or not. The framework can be downloaded from: http://spirit.sourceforge.net/index.php?doc=download/v1_5.html Synopsis: ~~~~~~ Spirit is an object oriented recursive descent parser generator framework implemented using template meta-programming techniques. Expression templates allow us to approximate the syntax of Extended Backus Normal Form (EBNF) completely in C++. Parser objects are composed through operator overloading and the result is a backtracking LL(inf) parser that is capable of parsing rather ambiguous grammars. The Spirit framework enables a target grammar to be written exclusively in C++. Inline EBNF grammar specifications can mix freely with other C++ code and, thanks to the generative power of C++ templates, are immediately executable. In retrospect, conventional compiler-compilers or parser-generators have to perform an additional translation step from the source EBNF code to C or C++ code. Regards, John Maddock (Spirit review manager). http://ourworld.compuserve.com/homepages/john_maddock/index.htm

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Type traits direct compiler support
by Edward Diener 14 Oct '02

14 Oct '02

What does it mean in the type_traits documentation that "direct compiler support for that traits class is required" ? I do not see that terminology explained anywhere and am lost as far as to what it refers.

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RedHat 7.3
by S. Scott Collis 14 Oct '02

14 Oct '02

I appologize if this has been addressed before. I did a quick search of the of the new group and didn't find anything. I just tried to port a code that uses Boost to a new computer loaded with RedHat 7.3. It seems that in 7.3 the /usr/include/asm/atomic.h header is different and generates a warning (i.e. #warning Using kernel header in userland program. BAD! instead of supplying routines like atomic_add and atomin_sub that are apparently required by Boost for the shared_ptr implementation. I ended up replacing this 7.3 header with one from 7.1 and this fixed the problem, but if anyone has a better solution, I would appreciate it. Thanks, Scott -- ===================================================================== Dr. Scott Collis, Asst. Prof. | Tel: (713) 348-3617 Dept. of Mechanical Engineering | Fax: (713) 348-5423 and Materials Science - MS 321 | Rice University | Email: collis(a)rice.edu Houston, TX 77005-1892 | http://mems.rice.edu/~collis =====================================================================

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d:\boost\boost_1_29_0\libs\thread\src\thread.cpp(107) : error C2065: '_beginthre
by satya_vajja 13 Oct '02

13 Oct '02

Hello, I am getting the following error while i compile boost thread library under VC++ 6.0. Could any of you please help me out. d:\boost\boost_1_29_0\libs\thread\src\thread.cpp(107) : error C2065: '_beginthreadex' : undeclared identifier When i define _MT compile flag the compiling error goes off but i get lot of linker errors. satya_vajja(a)yahoo.com Thanks Satya

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regex questions in 1_29_0 with g++ 3.1.1
by Anibal Jodorcovsky 13 Oct '02

13 Oct '02

Hi all, I've been using regex 3.20 with g++ 2.95.3 with no problems. We're in the process of moving towards g++ 3.1.1 (we have a library we need to use and it core dumps with 2.95.3 due to a bug in the stdc++ that goes with it in ofstream). So, I have g++ 3.1.1 working fine in redhat 6.2. I couldn't find the regex standalone library so I ended up downloading the whole boost suite (1_29_0) and I built only the regex++ library. I have one comment regarding this version (which I don't know what it is BTW. What's the version of regex++ in boost 1_29_0?, I guess it's 3.31). It seems that boost:cmatch doesn't work anymore when doing a regex_search, I ended up modifying boost:cmatch with boost::match_results<std::string::const_iterator>, I hope that's ok. I'm also having some trouble compiling some code but this is a problem with the new STL implementation that ships with g++ 3.1.1 (the v3 STL). I can't seem to find the solution, that's why I'm asking here, if anybody has any pointers I'll be very grateful. Look at what I get: commit.cpp: In function `void findSopInstances(IDB_HANDLE**, const std::vector<CommitSopInfo, std::allocator<CommitSopInfo> >&, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> >&, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> >&)': commit.cpp:737: conversion from `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> > > ' to non-scalar type `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >' requested commit.cpp:738: no match for `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >& < __gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> > >' operator commit.cpp:742: cannot convert `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >' to `const CommitSopInfo*' for argument `2' to `bool haveSopInstance(IDB_HANDLE**, const CommitSopInfo*)' commit.cpp: In function `int buildSopSeq(const std::vector<CommitSopInfo, std::allocator<CommitSopInfo> >&, SQ_TYPE, void***)': commit.cpp:913: conversion from `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> > > ' to non-scalar type `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >' requested commit.cpp:914: no match for `__gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<const CommitSopInfo, std::allocator<const CommitSopInfo> > >& < __gnu_cxx::__normal_iterator<const CommitSopInfo*, std::vector<CommitSopInfo, std::allocator<CommitSopInfo> > >' operator make: *** [commit.o] Error 1 And the code it complains about is this: static void findSopInstances( IDB_HANDLE** idbHandle, const std::vector<CommitSopInfo>& rSopList, std::vector<CommitSopInfo>& rSuccesses, std::vector<CommitSopInfo>& rFailures ) { static const char * func = "(findSopInstances)"; // Iterate over list of SOP instances for ( std::vector<const CommitSopInfo>::iterator pos = rSopList.begin(); pos < rSopList.end(); pos++ ) { // Test whether we have this instance if ( haveSopInstance( idbHandle, pos ) ) { ...... Where haveSopInstance is defined as: static bool haveSopInstance( IDB_HANDLE** idbHandle, const CommitSopInfo* pSopInfo ) { now, this used to compile fine under g++2.95.3 with its stdc++. I don't see why it's having difficuly converting the interator to the CommitSopInfo*. Any ideas? thanks a lot, -Anibal

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controlling edge sequence during traversal
by Jakub Plichta 12 Oct '02

12 Oct '02

Hello I am using an adjacency list graph. During a dfs traversal I would like to be control the order of edge traversal. Specifically I have an edge property with an index value and I would like to traverse the higher index edges first. I have tried getting the out_edges iterator and resorting the edges base on their index but that does not seem to make any difference. Any suggestions would be very greatly appreciated. Thanks Jakub Plichta [Non-text portions of this message have been removed]

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RE: [Boost-Users] Re: boost vs. The Lawyers (non-technical)
by Elliot Murphy 11 Oct '02

11 Oct '02

That would be helpful. Some of my colleagues have had terribly frustrating experiences trying to get our lawyers to approve the use of various boost libraries. The lawyers don't seem to like the idea of going into every source file to read a license agreement. -elliot -----Original Message----- From: James Curran/MVP [mailto:jamescurran@mvps.org] Sent: Thursday, October 10, 2002 9:58 AM To: boost-users(a)yahoogroups.com Subject: [Boost-Users] Re: boost vs. The Lawyers (non-technical) "Douglas Gregor" <gregod(a)cs.rpi.edu> wrote in message news:200210090000.23639.gregod@cs.rpi.edu... > Each Boost library has its own license that _must_ meet those requirements. Of > course, that won't satisfy the lawyers, so you'll probably have to send them > the individual library licenses for approval. > > We really could do much better in this area: at the very least, we could > provide a comprehensive list of the licenses for each library. Perhaps we should add to our "standard" a requirement that a printable license page by included with each libraries' documentation (with one or more "fill-in-the-blank" templates/samples available on www.boost.org) -- Truth, James Curran www.NovelTheory.com (Personal) www.NJTheater.com (Professional) www.aurora-inc.com (Day job) Yahoo! Groups Sponsor ADVERTISEMENT Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

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RE: [Boost-Users] Problem with boost::any.
by Jim.Hyslop 11 Oct '02

11 Oct '02

Luc Bergeron [mailto:bluc@videotron.ca] wrote: > Greets, > > I'm trying to use the boost::any component but i'm having > problem with > it !!! I'm using it because I need a way to store parameters of > different type. That real fine but I can't retrieve the value > from the > boost::any. This is what i've tried : > > std::string GetStringFromAny(const boost::any& val) const > { > std::string strVal; > try > { > strVal = boost::any_cast<std::string>(val); > } > catch(boost::bad_any_cast &err) > { > std::cerr << err.what() << std::endl; > return ""; > } > return strVal; > } > > But I always have a bad_any_cast exception. From the > documentation, at > leats what I understand of it, "If passed a value or reference, it > returns a copy of the value content if successful". Can > someone point me > in the right direction as to how can I extract the value within a > boost::any type, I think i'm lost !!! :) The following program works for me, without any error (using MSVC6): #include <boost/any.hpp> #include <string> #include <iostream> std::string GetStringFromAny(const boost::any& val) { std::string strVal; try { strVal = boost::any_cast<std::string>(val); } catch(boost::bad_any_cast &err) { std::cerr << err.what() << std::endl; return ""; } return strVal; } int main() { boost::any anAny( std::string("Hello, world") ); std::string converted = GetStringFromAny( anAny ); std::cout << "Converted: [" << converted << "]" << std::endl; } The output, as I expected, was: Converted: [Hello, world] Note that if I add more to main: int main() { boost::any anAny( std::string("Hello, world") ); std::string converted = GetStringFromAny( anAny ); std::cout << "Converted: [" << converted << "]" << std::endl; anAny = 23; converted = GetStringFromAny( anAny ); std::cout << "Converted: [" << converted << "]" << std::endl; } the second conversion fails. The conversion will only succeed if the type that boost::any currently holds can be implicitly converted into the type you want to retrieve. If you want to convert from (for example) an int to a string, you'll need boost::lexical_cast. -- Jim -- Jim

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Problem with boost::any.
by Luc Bergeron 11 Oct '02

11 Oct '02

Greets, I'm trying to use the boost::any component but i'm having problem with it !!! I'm using it because I need a way to store parameters of different type. That real fine but I can't retrieve the value from the boost::any. This is what i've tried : std::string GetStringFromAny(const boost::any& val) const { std::string strVal; try { strVal = boost::any_cast<std::string>(val); } catch(boost::bad_any_cast &err) { std::cerr << err.what() << std::endl; return ""; } return strVal; } But I always have a bad_any_cast exception. From the documentation, at leats what I understand of it, "If passed a value or reference, it returns a copy of the value content if successful". Can someone point me in the right direction as to how can I extract the value within a boost::any type, I think i'm lost !!! :) Thanks in advance for any help. Luc.

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Possible bug in boost_1_28
by Christopher Henrich 11 Oct '02

11 Oct '02

This bug comes up when I try to include <boost/array.hpp> in certain CodeWarrior projects. (CodeWarrior 8.0, running under Mac OS 10.1.5 on G3 "beige tower") If I initialize the project with stationery "C++ Console Mach-O", and I change HelloWorld.cp to include <boost/array.hpp>, then I get this error message: Error: undefined identifier 'ptrdiff_t' suffix.hpp line 204 included from config.hpp: 57 array.hpp:27 HelloWorld.cp: 10 If I initialize with PowerPlant stationery, I do not have this problem. Chris Henrich

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