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#!/usr/bin/perl |
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|
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use strict; |
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|
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print <<EOF; |
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// THIS IS A GENERATED FILE: RUN callback.pl to regenerate it |
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// THIS IS A GENERATED FILE: callback.pl is part of the GVPE |
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// THIS IS A GENERATED FILE: distribution. |
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|
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/* |
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callback.h -- C++ callback mechanism |
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Copyright (C) 2003-2007 Marc Lehmann <pcg\@goof.com> |
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|
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This file is part of GVPE. |
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|
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GVPE is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with gvpe; if not, write to the Free Software |
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Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#ifndef CALLBACK_H__ |
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#define CALLBACK_H__ |
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|
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#define CALLBACK_H_VERSION 3 |
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|
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template<class signature> |
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struct callback_funtype_trait; |
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|
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template<int arity, class signature> |
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struct callback_get_impl; |
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|
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EOF |
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|
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for my $a (0..10) { |
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my $CLASS = join "", map ", class A$_", 1..$a; |
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my $TYPE = join ", ", map "A$_", 1..$a; |
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my $ARG = join ", ", map "a$_", 1..$a; |
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my $TYPEARG = join ", ", map "A$_ a$_", 1..$a; |
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my $TYPEDEFS = join " ", map "typedef A$_ arg$_\_type;", 1..$a; |
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my $TYPEvoid = $TYPE ? $TYPE : "void"; |
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my $_TYPE = $TYPE ? ", $TYPE" : ""; |
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my $_TTYPE = $a ? join "", map ", typename T::arg$_\_type", 1..$a : ""; |
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|
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print <<EOF; |
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template<class R$CLASS> |
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class callback$a |
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{ |
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struct klass; // it is vital that this is never defined |
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|
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typedef R (klass::*ptr_type)($TYPE); |
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|
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klass *o; |
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R (klass::*m)($TYPE); |
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|
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public: |
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template<class O1, class O2> |
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explicit callback$a (O1 *object, R (O2::*method)($TYPE)) |
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{ |
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o = reinterpret_cast<klass *>(object); |
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m = reinterpret_cast<R (klass::*)($TYPE)>(method); |
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} |
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|
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// this works because a standards-compliant C++ compiler |
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// basically can't help it: it doesn't have the knowledge |
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// required to miscompile (klass is not defined anywhere |
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// and nothing is known about the constructor arguments) :) |
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R call($TYPEARG) const |
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{ |
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return (o->*m) ($ARG); |
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} |
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|
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R operator ()($TYPEARG) const |
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{ |
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return call ($ARG); |
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} |
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}; |
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|
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template<class R$CLASS> |
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struct callback_funtype_trait$a |
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{ |
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static const int arity = $a; |
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typedef R type ($TYPEvoid); |
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typedef R result_type; |
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$TYPEDEFS |
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}; |
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|
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template<class R$CLASS> |
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struct callback_funtype_trait<R ($TYPE)> : callback_funtype_trait$a<R$_TYPE> |
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{ |
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}; |
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|
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template<class signature> |
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struct callback_get_impl<$a, signature> |
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{ |
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typedef callback_funtype_trait<signature> T; |
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typedef callback$a<typename T::result_type$_TTYPE> type; |
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}; |
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|
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EOF |
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} |
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|
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print <<EOF |
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|
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template<class signature> |
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struct callback : callback_get_impl<callback_funtype_trait<signature>::arity, signature>::type |
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{ |
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typedef typename callback_get_impl<callback_funtype_trait<signature>::arity, signature>::type base_type; |
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|
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template<class O, class M> |
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explicit callback (O object, M method) |
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: base_type (object, method) |
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{ |
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} |
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}; |
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|
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#endif |
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EOF |
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|
