July 2004 - Boost-users - lists.boost.org

Source of Boost Graph Library
by JONATHAN JAMES HITCHCOCK 14 Jul '04

14 Jul '04

Please can anyone tell me where to find the source files for the Boost Graph Library? I downloaded boost_1_31_0.tar.gz and expected to find the source files in boost-1.31.0/libs/graph/src, but the only files there are for something called graphviz.

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shared_ptr: LWM versus atomic_count?
by Caleb Epstein 14 Jul '04

14 Jul '04

I've been perusing the source code of <boost/shared_ptr.hpp> and noticed that it uses the <boost/detail/shared_count.hpp> class to do reference counting and not <boost/detail/atomic_count.hpp> (unless BOOST_NO_MEMBER_TEMPLATES or BOOST_MSVC6_MEMBER_TEMPLATES are defined). Can anyone comment on the reasoning behind using a lightweight mutex-protected counter instead of an atomic counter? I'd think that an atomic counter would be faster, but I suspect that there is a good reason for protecting the count with a mutex. This then begs the question of why use the atomic counter in the situations mentioned above? Thanks. -- Caleb Epstein caleb.epstein(a)gmail.com

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need help building on AIX 5.1
by Jim Edwards 13 Jul '04

13 Jul '04

Hi, Beginning at the top, apparently my cpp doesn't like the syntax of BOOST_TESTED_AT(0x531) : xlc-C++-action bin/boost/libs/python/build/libboost_python.so/vacpp/debug/numeric.o "/home/jedwards/cvs_src/boost/boost/iterator/detail/config_def.hpp", line 28.39: 1540-0827 (S) The constant expression on the #if directive contains a syntax error at "BOOST_TESTED_AT". -- Jim Edwards jedwards(a)ucar.edu IBM Applications Analyst NCAR SCD BOULDER CO 303-497-1842

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building boost under mingw: bjam invokes VC7??
by Brewer, Christopher 13 Jul '04

13 Jul '04

Hello, all- I recently attempted to build and install boost 1.31.0 using msys (i.e., mingw). I enter the boost directory and start bjam with: bjam -sTOOL=mingw install ...and then I see bjam invoking vc7 instead of gcc. For example: "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\cl" ... followed by many, many errors, as VC7 is not installed on my system. I don't understand why bjam thinks it should be using VC7. Can anyone offer any advice or a workaround? I'm using the latest version of both msys and mingw under Windows 2000, and mingw is installed *under* msys, if that makes a difference. Regards, Chris Brewer (Company-mandated disclaimer) This message originates from WMS Gaming Inc. It contains information which may be confidential or privileged and is intended only for the individual or entity named above. It is prohibited for anyone else to disclose, copy, distribute or use the contents of this message. All personal messages express views solely of the sender, which are not to be attributed to WMS Gaming Inc., and may not be copied or distributed without this disclaimer. If you received this message in error, please notify us immediately at (847) 785-3000.

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Limitation of boost::protect of Boost.Bind
by Sigg＠inf.ethz.ch 13 Jul '04

13 Jul '04

Hi, I would like to bind a function which takes a boost::function<void> as parameter, let's say void caller(boost::function<void (void)>& f) { f(); } void foo() {} boost::function<void (void)> foo_fun = &foo; boost::bind(caller, foo_fun)(); But what if the function has a parameter, for example void bar(int i) {} How can I create the folling a function object? boost::function<void (int)> The function object should take an int, bind it to bar and then call caller with the resulting nullary function. boost::function<void (int)> bar_fun = &bar; // doesn't work because caller and bar are being composed. boost:bind(caller, boost::bind(bar_fun, _1)) // doesn't work because caller doesn't accept a unary function. boost:bind(caller, boost::protect(boost::bind(bar_fun, _1))) Does anyone have a clean solution for that? boost::protect doesn't provide the option to evaluate the arguments (_1) but _not_ perform a composition. Regards, Christian

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RE: [Boost-users] building boost under mingw: bjam invokes VC7??
by Ben Hutchings 13 Jul '04

13 Jul '04

Christopher Brewer <cbrewer(a)wmsgaming.com> wrote: > I recently attempted to build and install boost 1.31.0 using > msys (i.e., mingw). > I enter the boost directory and start bjam with: > > bjam -sTOOL=mingw install > > ...and then I see bjam invoking vc7 instead of gcc. <snip> The variable is called TOOLS, not TOOL.

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Fw: Parser error from semantic actions
by Hermann Oliveira Rodrigues 12 Jul '04

12 Jul '04

Hi, How can I inform an error from a semantic action? Consider the following code: rule = IDENTIFIER[ callback_a( m_varBinder, &VarBinder::bind ) ]; callback_a is an actor allowing member calls in semantic actions. VarBinder::bind receives an identifier and try to locate it in an external symbol table. If bind fails, I like to inform a parser error back to Spirit. How can I do that? Pointers to the relevant parts in the documentation are welcome. Hermann [My apologies for sending a Spirit specific question to boost-users lists. However, I getting an administrative error from the sourceforge mail server]

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Help with tuples - repeated members
by John.Wismar＠autozone.com 12 Jul '04

12 Jul '04

I've been playing with Boost's tuples library, but I'm having some trouble working through a wrinkle: I have some routines that use tuple<int>, tuple<int, int>, etc., up to tuple<int, int, int, int, int>. I'd like to be able to declare these objects using an alternative notation, along the lines of: tuple_clone<int, 1>, tuple_clone<int, 2>, tuple_clone<int, 3>, etc. The objective would be to allow me to write a function template that looked something like this: template <int N> tuple_clone<int, N> fn(tuple_clone<int, N-1> t) { tuple_clone<int, N> ret; ret.get_head() = getValue(); ret.get_tail() = t; return ret; } Each time I try to write tuple_clone, though, I end up stumped. Is it possible to write something like this, while leveraging the tuples library? Or is there a different approach I ought to look into? Thanks! -------------------------------- John Wismar john.wismar(a)autozone.com ------------------------------------------------------------------------ The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

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FW: "memory access violation" in boost::serialization
by Dirk Griffioen 12 Jul '04

12 Jul '04

Hi, I encountered the following little problem: I would like to use the following datastructures with boost::serialize: struct Match {}; typedef std::string Key; typedef tst< Match, Key > TernarySearchTree; //this one has a shared_ptr typedef std::vector< TernarySearchTree > Trees; typedef std::map< std::string, Trees > Symbols; I have defined some serialize overloads so saving goes fine, but when loading I get a "memory acces violation" inside the following code: { boost::archive::text_iarchive ia(ifs); ia >> symbols_; } More specific, inside <boost/serializiton/shared_count.hpp> void add_ref_copy() { #if defined(BOOST_HAS_THREADS) mutex_type::scoped_lock lock(mtx_); #endif ++use_count_; } Which constructs a scoped_lock, and there, the "explicit scoped_lock(lightweight_mutex & m): m_(m)" seems to go wrong. What could be the reason? The more since all worked fine (saving and loading) when I used a simple vector of tst's. Is it not possible to use a map of string/vector (the error seems to suggest the library failing when copying vector to map - eg ++use_count of the shared_ptr inside the TST). Thanks in advance, Dirk

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Re: Sun Solaris Forte 8 and boost_1_31_0
by Yaron Hirsch 12 Jul '04

12 Jul '04

Hi, I've also tried to compile RegEx with Forte 8. Did you try that? I think I managed to get things to compile, but unfortunately, when I try to compile it in 64-bit mode, we still get problems. Is there any chance you've tried compiling it in 64-bits? Thanks. "Christopher Currie" <codemonkey(a)gmail.com> wrote in message news:<cc43hj$8kl$1(a)sea.gmane.org>... > Tom Aratari wrote: > > > Tell me about it! I have to cross platform compile many things, and > > templating on Forte is not fun. But the template support > > in Forte 8 is MUCH improved over 7.2 .. The syntax is weird but I have > > gotten things to compile. > > Patches are always welcome ... :-) > > -- > Christopher Currie <codemonkey(a)gmail.com>

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