September 2002 - Boost-users - lists.preview.boost.org

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/

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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! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. ----------------------------------------------------------------------- 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] 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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R: [Boost-Users] std::swap() vs boost::swap()
by Galante Michele 26 Sep '02

26 Sep '02

> 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). Thank you Steve and Doug. Michele Galante Zucchetti Centro Sistemi s.p.a. m.galante(a)centrosistemi.it

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

26 Sep '02

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! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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intrusive_ptr
by nobody 26 Sep '02

26 Sep '02

Hi! There is a intrusive_ptr.cpp in boost 1.28, but I did not find any doc for that... exept for in the timing . Why? Guessing from the name, intrusive_ptr requires the pointed-to object to store the reference count or something like that, doesn't it? And what does anybody think of typedefing std::auto_ptr to boost::single_ptr? Finally I have a suggestion for a new type of smart pointer one could call "notifying_ptr": Sometimes all weak pointing objects need to be notified when the object pointed to is destroyed: e.g. in a game some units are set to attack some building, so they store a weak_ptr to the building, but when that building is destroyed, it would be easier to implement and faster performing, if the units got a message so they can look for a new target, instead of having strong pointers, marking the building as dead, and polling for that state every time the unit does something. It could be quite some time until all units have realized that the building is gone and it really can be released from memory. Regards

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

26 Sep '02

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/

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