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shared_ptr and counted_base
by Bobby Thomale 27 Sep '02

27 Sep '02

I was looking through the latest boost documentation, trying to find a way to get a shared_ptr from a this pointer of an object that already is contained by a shared_ptr somewhere, without knowing about that other shared_ptr out there. I noticed this intriguing comment in the latest docs: > [This constructor has been changed to a template in order to remember the > actual pointer type passed. The destructor will call delete with the same > pointer, complete with its original type, even when T does not have a virtual > destructor, or is void. > > In the current implementation, if p is convertible to counted_base *, > shared_ptr will use the embedded reference count supplied by counted_base. > This is an (experimental) attempt to provide a way for shared_ptr to be > constructed from a raw pointer such as this. A free function > shared_from_this(q) performs the conversion when q is convertible to > counted_base const *. > > The optional intrusive counting employed by the current implementation allows > shared_ptr to interoperate with intrusive_ptr, an experimental generic > intrusive-counted smart pointer. > > Another possible implementation is to use a global pointer-to-count map > instead of intrusive counting. shared_from_this would no longer be O(1), which > is a concern for some users, although I do not expect any performance > problems, since the operation is rare. Maintaining a global map is difficult; > it needs to be initialized before any shared_ptr instances are constructed, > and the initialization needs to be thread safe. In addition, under the Windows > dynamic library model, it is possible for several maps to exist. > > It is not yet clear which implementation should be used, or whether the > specification should allow both; nevertheless, the ability to make a > shared_ptr from this is considered essential by experienced smart pointer > users.] That looks like EXACTLY what I am looking for. But a couple things aren't clear to me: 1. Usage - The docs tell me its there but don't really say explicitly how to use it. It looks like, to use this, all I have to do is subclass boost::counted_base in my class that is being shared. Then I can just call shared_from_this to get another shared_ptr out of myself and it should just work. If that is all I have to do, then awesome! Is it really that easy or is there another step I am missing? 2. The word "experimental" above scares me. :-) If I use the counted_base subclass and shared_from_this function, is that code going to break later on if you guys change your minds? Anyway, I just want to reiterate what the comment at the end says, that the ability to make a shared_ptr from *this is essential to use these things. :-) -- Bobby --------------------------------------------------------------------- Bobby Thomale Senior Software Developer Inoveon Corporation http://www.inoveon.com/ ---------------------------------------------------------------------

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Returning a boost::scoped_lock by value
by Raoul Gough 27 Sep '02

27 Sep '02

boost::scoped_lock is non-copyable, so it is impossible to return one from a function by value. However, I would like to be able to do something like this: mt::holder<std::ostream> logStream; logStream() << "Hello world\n"; where the operator() returns a proxy object that contains a scoped_lock and a pointer to the data (the ostream). What I currently have is this: (mt::proxy<std::ostream> (logStream)) << "Hello world\n"; So the client code has to know what type the proxy object is and construct one itself. If scoped_lock would provide access to its associated mutex object, this wouldn't be a necessary, because the proxy object could then have a copy-constructor, and operator() in the holder template would look like this: proxy<T> operator() () { proxy<T> temp (*this); return temp; } The proxy copy constructor would unlock() the original lock and construct the copy using the original's mutex (which is the part that can't currently work, because there is no public access to a lock's mutex). Assuming that the compiler implements the NRVO, the unlock/lock sequence wouldn't actually happen, and the client code just gets its proxy object constructed for it. If the compiler doesn't implement the NRVO, the code still works, but is less efficient. I guess exposing the raw mutex from scoped_lock would break an important level of encapsulation. Still, it would be kind of nice in this case. Maybe if proxy<T> were part of the library and made a friend of scoped_lock? The only other alternative I've come up with is to allocate the lock on the heap and return an object containing a std::auto_ptr (which makes usage easier, but less efficient). Any comments or suggestions? Regards, Raoul Gough. // Returnable proxy template template<typename T> class proxy { boost::mutex::scoped_lock mLock; T *mPtr; boost::mutex &release() { mLock.unlock(); return mLock.mutex(); // <<<< doesn't work } public: proxy (proxy &other) : mLock (other.release()) , mPtr (other.mPtr) { } // ... };

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[BGL]: Iterating through internal properties of specific value
by Björn Lindberg 27 Sep '02

27 Sep '02

I have a BGL graph (adjacency_list). I use it to represent a tree, and so I have an internal vertex property of type enum representing the node type, ie ROOT, LEAF, INNER. Now, I would like a way to access only the leaves of a tree, preferrably through iterators. I can't think of any good way to accomplish this, except possibly by writing new iterator classes which would internally keep track of a property map and thus hide traversal of the non-leaf nodes from the code using the iterators. This seems like a cumbersome approach though, and I'm hoping there is a simpler way? Björn

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RE: [Boost-Users] metaprogramming and MPL
by Aleksey Gurtovoy 27 Sep '02

27 Sep '02

Ihsan Ali Al Darhi wrote: > I am interested in metaprogramming and Boost mpl. But I can't find a > complete doc about the two subjects together. Where on the > net I can such info? It's not exactly a "complete doc" yet, but it's the most of that is publicly available to the moment - http://www.mywikinet.com/mpl/. Note that MPL sources in the CVS main trunk are more up-to-date than the .zip archive available for download from the library's page. HTH, Aleksey

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newbie Question about the macro BOOST_JOIN
by zhangwusheng 27 Sep '02

27 Sep '02

Hi,all, In file suffix.hpp there are lines: #define BOOST_JOIN( X, Y ) BOOST_DO_JOIN( X, Y ) #define BOOST_DO_JOIN( X, Y ) BOOST_DO_JOIN2(X,Y) #define BOOST_DO_JOIN2( X, Y ) X##Y why donot we define such macro instead: #define BOOST_JOIN( X, Y ) X##Y thanks in advance.

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RE: [Boost-Users] bind: I just keep trying...
by dick.bridges＠tais.com 26 Sep '02

26 Sep '02

<datapoints> MSDN January 2002 contains only the 'old' level 1 definition. Q113417 from that same source says the compiler generates the warning with both the /Ze and /Za switches. The 'online' MSDN contains only the level 3 definition. You're running SP3 and I'm running SP5. </datapoints> THEREFORE: #pragma warning(disable : 4097) // ;) #include <boost/function.hpp> #pragma warning(default : 4097) Thanks for the input. "Jim.Hyslop" <jim.hyslop@leit To: "'Boost-Users(a)yahoogroups.com'" <Boost-Users(a)yahoogroups.com> ch.com> cc: Subject: RE: [Boost-Users] bind: I just keep trying... 09/26/2002 01:01 PM Please respond to Boost-Users dick.bridges(a)tais.com [mailto:dick.bridges@tais.com] wrote: > Well, that helped A LOT. The only warnings I get now are: > > <warnings> > c:\boost\function.hpp(451) : warning C4097: typedef-name > 'base_type' used > as synonym for class-name > 'function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>::function1<R,T0, > `template-parameter268',`template-parameter269',`template-para > meter270'>' > The warning level is 4: I'm paranoid. Can these safely be ignored? According to the MSDN: ---------------- begin quote from MSDN ----------------------------- Compiler Warning (level 3) C4097 typedef-name 'identifier1' used as synonym for class-name 'identifier2' A typedef name which names a class is itself a class name. However, only a class declared without a tag can be named. In the following line of code the typedef name P is promoted to class name but Q is not. typedef struct { int member; } P, Q; Q remains a normal typedef name and a synonym for the class. The following example causes this warning: typedef struct _T { int i; } T; struct U : T { int j; }; // warning struct V : _T { int j; }; // OK ------------------------ end quote from MSDN ------------------------- However, when I tried compiling the example, MSVC6 SP3 at warning level 4 was completely silent. So I'm really confused now - is it a problem or not? My instinct says no, but I've been wrong before. -- Jim 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 http://docs.yahoo.com/info/terms/

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Re: [Boost-Users] bind: I just keep trying...
by dick.bridges＠tais.com 26 Sep '02

26 Sep '02

Well, that helped A LOT. The only warnings I get now are: <warnings> c:\boost\function.hpp(451) : warning C4097: typedef-name 'base_type' used as synonym for class-name 'function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>::function1<R,T0, `template-parameter268',`template-parameter269',`template-parameter270'>' c:\boost\function.hpp(497) : see reference to class template instantiation 'boost::function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>' being compiled c:\boost\function.hpp(452) : warning C4097: typedef-name 'base_type' used as synonym for class-name 'function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>::function1<R,T0, `template-parameter268',`template-parameter269',`template-parameter270'>' c:\boost\function.hpp(497) : see reference to class template instantiation 'boost::function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>' being compiled c:\boost\function.hpp(453) : warning C4097: typedef-name 'base_type' used as synonym for class-name 'function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>::function1<R,T0, `template-parameter268',`template-parameter269',`template-parameter270'>' c:\boost\function.hpp(497) : see reference to class template instantiation 'boost::function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>' being compiled </warnings> The warning level is 4: I'm paranoid. Can these safely be ignored? Douglas Gregor <gregod(a)cs.rpi.e To: Boost-Users(a)yahoogroups.com du> cc: Subject: Re: [Boost-Users] bind: I just keep trying... 09/26/2002 10:09 AM Please respond to Boost-Users On Thursday 26 September 2002 01:02 pm, dick.bridges(a)tais.com wrote: > Thanks. I changed the map to: > typedef map<session_id, boost::function<long, Y*, X*> > MyMessageMap; > > No errors but enough warnings to choke a horse. Have I just been nailed by > VC6SP4? If so, I think I'll just give up and map the session-ids to Y*s. > %>( > > Thanks in advance for any suggestions. I've never seen that warning before. What warning level are you using? Anyway, just change boost::function<long, Y*, X*> to boost::function2<long, Y*, X*> Then you'll be in conformance with upcoming Boost releases (Boost 1.29.0 deprecates the former syntax), and the warning should disappear. Doug 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 http://docs.yahoo.com/info/terms/

2 1

RE: [Boost-Users] bind: I just keep trying...
by Jim.Hyslop 26 Sep '02

26 Sep '02

dick.bridges(a)tais.com [mailto:dick.bridges@tais.com] wrote: > Well, that helped A LOT. The only warnings I get now are: > > <warnings> > c:\boost\function.hpp(451) : warning C4097: typedef-name > 'base_type' used > as synonym for class-name > 'function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>::function1<R,T0, > `template-parameter268',`template-parameter269',`template-para > meter270'>' > The warning level is 4: I'm paranoid. Can these safely be ignored? According to the MSDN: ---------------- begin quote from MSDN ----------------------------- Compiler Warning (level 3) C4097 typedef-name 'identifier1' used as synonym for class-name 'identifier2' A typedef name which names a class is itself a class name. However, only a class declared without a tag can be named. In the following line of code the typedef name P is promoted to class name but Q is not. typedef struct { int member; } P, Q; Q remains a normal typedef name and a synonym for the class. The following example causes this warning: typedef struct _T { int i; } T; struct U : T { int j; }; // warning struct V : _T { int j; }; // OK ------------------------ end quote from MSDN ------------------------- However, when I tried compiling the example, MSVC6 SP3 at warning level 4 was completely silent. So I'm really confused now - is it a problem or not? My instinct says no, but I've been wrong before. -- Jim

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RE: [Boost-Users] bind: I just keep trying...
by dick.bridges＠tais.com 26 Sep '02

26 Sep '02

Thanks. I changed the map to: typedef map<session_id, boost::function<long, Y*, X*> > MyMessageMap; No errors but enough warnings to choke a horse. Have I just been nailed by VC6SP4? If so, I think I'll just give up and map the session-ids to Y*s. %>( Thanks in advance for any suggestions. <warnings> --------------------Configuration: MyProject - Win32 Debug-------------------- Compiling... Z.cpp c:\boost\function.hpp(451) : warning C4097: typedef-name 'base_type' used as synonym for class-name 'function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>::function1<R,T0, `template-parameter268',`template-parameter269',`template-parameter270'>' c:\boost\function.hpp(497) : see reference to class template instantiation 'boost::function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>' being compiled c:\boost\function.hpp(452) : warning C4097: typedef-name 'base_type' used as synonym for class-name 'function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>::function1<R,T0, `template-parameter268',`template-parameter269',`template-parameter270'>' c:\boost\function.hpp(497) : see reference to class template instantiation 'boost::function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>' being compiled c:\boost\function.hpp(453) : warning C4097: typedef-name 'base_type' used as synonym for class-name 'function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>::function1<R,T0, `template-parameter268',`template-parameter269',`template-parameter270'>' c:\boost\function.hpp(497) : see reference to class template instantiation 'boost::function<R,T1,T2,T3,T4,T5,T6,T7,T8,T9,T10>' being compiled c:\boost\function.hpp(451) : warning C4097: typedef-name 'base_type' used as synonym for class-name 'function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,st ruct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable>::fun ction2<int,class Y *,class X *,struct boost::empty_function_policy,struct boost::empty_function_mixin,class std::allocator<class boost::function_base> >' c:\program files\microsoft visual studio\vc98\include\utility(26) : see reference to class template instantiation 'boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::fu nction::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::funct ion::unusable>' being compiled c:\program files\microsoft visual studio\vc98\include\xtree(28) : see reference to class template instantiation 'std::pair<class session_id const ,class boost::function<int,class Y *,class X *,struct boost::detail:: function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::fun ction::unusable,struct boost::detail::function::unusable> >' being compiled c:\program files\microsoft visual studio\vc98\include\map(46) : see reference to class template instantiation 'std::_Tree<class session_id,struct std::pair<class session_id const ,class boost::function<int,class Y *,c lass X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::functi on::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable> >,struct std::map<class session_id,class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struc t boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct b oost::detail::function::unusable>,struct std::less<class session_id>,class std::allocator<class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struc t boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable> > >::_K fn,struct std::less<class session_id>,class std::allocator<class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unus able,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable> > >' being compiled c:\src\inc\Z.h(240) : see reference to class template instantiation 'std::map<class session_id,class boost::function<int,class Y *,class X *,struct boost::detail::function ::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::u nusable,struct boost::detail::function::unusable>,struct std::less<class session_id>,class std::allocator<class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function ::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::u nusable> > >' being compiled c:\boost\function.hpp(452) : warning C4097: typedef-name 'base_type' used as synonym for class-name 'function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,st ruct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable>::fun ction2<int,class Y *,class X *,struct boost::empty_function_policy,struct boost::empty_function_mixin,class std::allocator<class boost::function_base> >' c:\program files\microsoft visual studio\vc98\include\utility(26) : see reference to class template instantiation 'boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::fu nction::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::funct ion::unusable>' being compiled c:\program files\microsoft visual studio\vc98\include\xtree(28) : see reference to class template instantiation 'std::pair<class session_id const ,class boost::function<int,class Y *,class X *,struct boost::detail:: function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::fun ction::unusable,struct boost::detail::function::unusable> >' being compiled c:\program files\microsoft visual studio\vc98\include\map(46) : see reference to class template instantiation 'std::_Tree<class session_id,struct std::pair<class session_id const ,class boost::function<int,class Y *,c lass X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::functi on::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable> >,struct std::map<class session_id,class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struc t boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct b oost::detail::function::unusable>,struct std::less<class session_id>,class std::allocator<class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struc t boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable> > >::_K fn,struct std::less<class session_id>,class std::allocator<class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unus able,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable> > >' being compiled c:\src\inc\Z.h(240) : see reference to class template instantiation 'std::map<class session_id,class boost::function<int,class Y *,class X *,struct boost::detail::function ::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::u nusable,struct boost::detail::function::unusable>,struct std::less<class session_id>,class std::allocator<class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function ::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::u nusable> > >' being compiled c:\boost\function.hpp(453) : warning C4097: typedef-name 'base_type' used as synonym for class-name 'function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,st ruct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable>::fun ction2<int,class Y *,class X *,struct boost::empty_function_policy,struct boost::empty_function_mixin,class std::allocator<class boost::function_base> >' c:\program files\microsoft visual studio\vc98\include\utility(26) : see reference to class template instantiation 'boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::fu nction::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::funct ion::unusable>' being compiled c:\program files\microsoft visual studio\vc98\include\xtree(28) : see reference to class template instantiation 'std::pair<class session_id const ,class boost::function<int,class Y *,class X *,struct boost::detail:: function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::fun ction::unusable,struct boost::detail::function::unusable> >' being compiled c:\program files\microsoft visual studio\vc98\include\map(46) : see reference to class template instantiation 'std::_Tree<class session_id,struct std::pair<class session_id const ,class boost::function<int,class Y *,c lass X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::functi on::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable> >,struct std::map<class session_id,class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struc t boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct b oost::detail::function::unusable>,struct std::less<class session_id>,class std::allocator<class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struc t boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable> > >::_K fn,struct std::less<class session_id>,class std::allocator<class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unus able,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable> > >' being compiled c:\src\inc\Z.h(240) : see reference to class template instantiation 'std::map<class session_id,class boost::function<int,class Y *,class X *,struct boost::detail::function ::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::u nusable,struct boost::detail::function::unusable>,struct std::less<class session_id>,class std::allocator<class boost::function<int,class Y *,class X *,struct boost::detail::function::unusable,struct boost::detail::function ::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::unusable,struct boost::detail::function::u nusable> > >' being compiled Z.obj - 0 error(s), 6 warning(s) </warnings> Tom Matelich <tmatelich@zetec To: "'Boost-Users(a)yahoogroups.com'" <Boost-Users(a)yahoogroups.com> .com> cc: Subject: RE: [Boost-Users] bind: I just keep trying... 09/26/2002 08:40 AM Please respond to Boost-Users I think the best solution for you would be to put boost::function<short>'s in your map. Look at the example in the bind documentation at http://www.boost.org/libs/bind/bind.html#with_boost_function Tom > -----Original Message----- > From: dick.bridges(a)tais.com [mailto:dick.bridges@tais.com] > Sent: Thursday, September 26, 2002 7:57 AM > To: Boost-Users(a)yahoogroups.com > Subject: RE: [Boost-Users] bind: I just keep trying... > > > > I'm trying to store member function pointers. For purposes of this > discussion, the key is an int. > > <context> > X is the virtual base class for polymorphic message classes. > all messages have a session-d attribute > > Ys are instances of classes derived from a virtual message hanler base > class. > foo() is the message handler function. > > Z is the 'message pump' that dispatches messages to Ys based upon the > session-id. > > Y instances insert make_pair(session-id, message_handler) > pairs into the > map. > (I think _1 is 'this' during the insert.) > > Z calls the Y instance message-handler using the session-id > key to the > map. > </context> > > > > > > > Mark Storer > > > <mstorer@cardiff To: > "'Boost-Users(a)yahoogroups.com'" <Boost-Users(a)yahoogroups.com> > > .com> cc: > > > Subject: RE: > [Boost-Users] bind: I just keep trying... > > 09/25/2002 04:47 > > > PM > > > Please respond > > > to Boost-Users > > > > > > > > > > > > > I'm a little confused as to what you're aiming for here... a > map of ints to > function pointers (that can point to Y::foo)? > > This should do the trick, provided I'm recalling my function pointer > declarations correctly > std::map<int, short()(*X)> > > Further boost::bind creates an INSTANCE of a functor. Giving > the compiler > an instance when it wants a type is not a good way to keep it happy. > > Now if what you're actually after is calling Y::foo on a > colleciton of Y's, > then you don't need a collection of function pointers for > each instance in > the first place, which is where bind comes in. According to my flimsy > understanding of bind (I haven't used it yet), this should do > the trick: > > X someX; > std::vector<Y> &wise = BuildYs(); // wise == plural of Y > > std::for_each( > wise.begin(), > wise.end(), > boost::bind<short>(&Y::foo, &someX) > ); > > If you want the X parameter to vary from one call of foo to > the next, I > suggest rolling your own loop... or incorporating the X* into > Y, at which > point you can get rid of the X* parameter, and use > boost::bind(&Y::foo), or > std::mem_fun(&Y::foo). > > --Mark Storer > Software Engineer > Cardiff Software > > #include <disclaimer> > typedef std::disclaimer<Cardiff> Discard; > > > -----Original Message----- > From: dick.bridges(a)tais.com [mailto:dick.bridges@tais.com] > Sent: Wednesday, September 25, 2002 4:08 PM > To: boost-users(a)yahoogroups.com > Subject: [Boost-Users] bind: I just keep trying... > > > Everytime I think I have a clue, I'm reminded how little I REALLY > understand. > > <error compiler='VC6SP4'> > 'map' : invalid template argument for '_Ty', type expected > </error> > > <snippet> > struct X > { > } > > struct Y > { > short foo(X*); > } > > struct Z > { > map<int, bind(&Y::foo, _1, _2) > myMap; > } > </snippet> > > I thought I saw how to do this somewhere on the website but I > sure can't > find it now. Any help GREATFULLY appreciated. > > > > 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 > http://docs.yahoo.com/info/terms/ > > > > 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 > http://docs.yahoo.com/info/terms/ > > > > > > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Home Selling? Try Us! > http://us.click.yahoo.com/QrPZMC/iTmEAA/MVfIAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > 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! 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RE: [Boost-Users] std::swap() vs boost::swap()
by scleary＠jerviswebb.com 26 Sep '02

26 Sep '02

> From: Galante Michele [mailto:M.Galante@centrosistemi.it] > > > Argument-dependent lookup will ensure that any 'swap' functions in the > > namespaces used by 'T' will be included in the set of known swap functions, > > along with std::swap. Overloading and partial ordering of function templates > > will then take over to ensure that the appropriate swap(a, b) will be called > > (even if it is boost::swap). > > I did not know this. I suppose this is the "Koenig lookup" that Steve > mentions in his reply. > I've tried this and it works with GCC 3.1 but unfortunately > not with BCC 5.6 > (so I think it is a Borland bug). Yes "Koenig lookup" is "argument-dependent lookup", and sadly several compilers still do not implement it. There's a workaround for the lack of Borland's support: using std::swap; // This should have been in my example to begin with... using boost::swap; swap(x, y); Which works on GCC 3.1.1 and BCC 5.6, and I would imagine any other compiler as well. The downside is that you have to list in your "generic" function all the namespaces that it can be used with -- which then makes it not-very-generic on compilers without Koenig lookup. But it's better than nothing... -Steve

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