- Boost-users - lists.preview.boost.org

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

1 0

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.

1 0

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]

3 2

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.

2 1

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

1 0

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>

2 1

Problem about build regex under win32 using stlpot5.0
by huangliang 12 Jul '04

12 Jul '04

Recently I begin to use stlport in my programs, and I want to build boost regex under win32 using vc6 and stlport 5.0. But when I build them,the following errors occurs: C:\lib\boost-1.30.2\libs\regex\build>set MSVCDIR= D:\Program Files\Microsoft Visual Studio\VC98\Bin C:\lib\boost-1.30.2\libs\regex\build>set STLPORT_PATH=E:/HuangLiang/c++stl/STLport-5.0-1031 C:\lib\boost-1.30.2\libs\regex\build>nmake -fvc6-stlport.mak cl /nologo /MT /W3 /GX /O2 /GB /GF /Gy /IE:/HuangLiang/c++stl/STLport-5.0-1031\stlport /I..\..\..\ /D_MT /DWIN32 /DNDEBUG /D_MBCS /D_LIB /YX /FD /c -Fpvc6-stlport/boost_regex_vc6-stlport_mss/boost_regex_vc6-stlport_mss.pch -Fo./vc6-stlport/boost_regex_vc6-stlport_mss/ -Fdvc6-stlport/boost_regex_vc6-stlport_mss.pdb ../src/cpp_regex_traits.cpp cpp_regex_traits.cpp ../src/cpp_regex_traits.cpp(662) : error C2660: 'isspace' : function does not take 2 parameters ../src/cpp_regex_traits.cpp(662) : fatal error C1903: unable to recover from previous error(s); stopping compilation After I searched msdn, I found that isspace have been defined at 2 places: isspace template<class E> bool isspace(E c, const locale& loc) const; The template function returns use_facet< ctype<E> >(loc). is(ctype<E>:: space, c). and in ctype.h. I remember when I compile regex using vc6 without stlport, no same errors occured. I need some help about what has happened with me. Thank you !

1 0

RE: [Boost-users] Generic Class Factory
by Mark Loew 09 Jul '04

09 Jul '04

I have been looking at Andre Alexandrescu's book Modern C++ Design. He has the Loki library in there. That has all of the pieces that are needed. Does anyone know of any issue with mixing Boost, ATL and Loki? A side question is has anyone looked at merging the Loki library into the Boost library. It seems like a really great fit as the Loki library deals with a different set of problems. Mark Loew, MCSD, MCSE Application Development Consultant Sagestone Consulting www.sagestone.com Grand Rapids, MI 616-954-9556 x149 Microsoft Gold Certified Partner mloew(a)sagestone.com -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Peter Dimov Sent: Thursday, July 08, 2004 7:41 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Generic Class Factory Mark Loew wrote: > I have to create a class factory and was looking for a generic class > factory that I could work with. I looked in the boost documentation > but didn't find anything. Is there something there that I am missing > or do I need to roll my own? Depending on your needs, map< string, function< shared_ptr<Base>() > > may suffice. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

1 0

Failed build using vc7.1
by Owen Jacobson 09 Jul '04

09 Jul '04

Salve. I'm trying to use boost.threads in my project, as they look like the cleanest cross-platform threading interface I've seen in a while, and I'm running into a wee problem convincing the libraries to build. My setup: Windows 2000 SP 4 Microsoft Visual C++ 7.1 (C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\) MS SDK (U:\Program Files\Microsoft SDK) Boost 1.31.0 (C:\boost_1_31_0, installing to C:\boost) Cygwin is installed, but not present in PATH; I am not using cygwin to build this project, only to run PostgreSQL. Python is not installed, as I have no need for it. Visual C++ 6.0 is also installed (for legacy projects), but not present in PATH. bjam is present in PATH, as downloaded from Sourceforge. C:\boost_1_31_0> bjam -v Boost.Jam Version 3.1.9. OS=NT. Attempting to run bjam results in a lengthy list of errors: -- long paste -- C:\boost_1_31_0> bjam -sTOOLS=vc7.1 --------------------------------------------------------------------- skipping Boost.Python library build due to missing or incorrect configuration (...) --------------------------------------------------------------------- ...patience... ...found 5266 targets... ...updating 747 targets... MkDir1 bin MkDir1 bin\boost MkDir1 bin\boost\libs MkDir1 bin\boost\libs\date_time MkDir1 bin\boost\libs\date_time\build MkDir1 bin\boost\libs\date_time\build\boost_date_time.dll MkDir1 bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1 MkDir1 bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug\greg_month.ob j The system cannot find the path specified. The system cannot find the path specified. CALL "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\VCVARS32.BAT" >nul "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\cl" /Zm800 -nologo -GX -c -DBOOST_DATE_TIME_POSIX_TIME_STD_CONFIG -DBOOST_ALL_D YN_LINK=1 /Z7 /Od /Ob0 /GX /GR /MDd /Op /Zc:forScope Zc:wchar_t -I"bin\boost\libs\date_time\build" -I"C:\boost_1_31_0" -Fo"bi n\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug\greg_month.obj" -Tp"C:\boost_1_31_0\libs\date_time\build\../src/gregorian/greg_month.cpp" ...failed vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc7.1\debug\greg_month.ob j... -- end paste -- (There is a complete build log at <http://machinae.lionsanctuary.net/2004/07/boost-log> (424KB).) What is vc-C++ doing and where can I find it? There is no file with that string in the name anywhere in the boost tree. As far as I can tell, it fails to build any object files at all. Any suggestions? Owen

3 2

mpl::vector -> boost::tuple
by Markus Werle 09 Jul '04

09 Jul '04

Hi! The example in libs/mpl/example/tuple_from_list.cpp and gen_linear_hierarchy from http://aspn.activestate.com/ASPN/Mail/Message/boost/1166644 template< typename Types, typename Unit, typename Root = mpl::none > struct gen_linear_hierarchy { typedef typename mpl::fold<Types,Unit,Root> ::type type; // here }; /* usage example: template< class Base, class T > struct EventHander : public Base { virtual void OnEvent(T& obj, int eventID) = 0; }; typedef gen_linear_hierarchy< mpl::list<Window,Button,ScrollBar> , EventHander<_1,_2> > ::type v; */ all seem to me work fine with default constructible types. What I need is a type generator which provides a constructor, such that code like this one works for mpl::vectors (or other mpl::sequences) with arbitrary length: ------------- class C { C(std::string const & gaga) {} }; struct gen_linear_hierarchy_with_constructor // your idea missing here { // and here }; typedef gen_linear_hierarchy_with_constructor<mpl::vector<C, C> >::type mytuple; mytuple mt("test", "Thanks for your help"); ------------------ Markus P.S.: David and Aleksey, if you read this here: I could not find your "coming soon" book at awprofessional.com. What's the current state of the book I wait for so long already ...

4 8