b49ae6eaf3
git-svn-id: svn://localhost/ardour2/branches/3.0@3437 d708f5d6-7413-0410-9779-e7cbd77b26cf
232 lines
8.9 KiB
Plaintext
232 lines
8.9 KiB
Plaintext
dnl Copyright 2002, The libsigc++ Development Team
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dnl
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dnl This library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public
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dnl License as published by the Free Software Foundation; either
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dnl version 2.1 of the License, or (at your option) any later version.
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dnl
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dnl This library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU Lesser General Public
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dnl License along with this library; if not, write to the Free Software
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dnl Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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dnl
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divert(-1)
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include(template.macros.m4)
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define([DEDUCE_RESULT_TYPE],[dnl
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template <LOOP(class T_arg%1=void, CALL_SIZE)>
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struct deduce_result_type
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ifelse($1,0,[dnl
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{ typedef typename adaptor_type::template deduce_result_type<LOOP(_P_(T_arg%1),eval($2-1))>::type type; };
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],[dnl
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{ typedef typename adaptor_type::template deduce_result_type<LIST(LOOP(_P_(T_arg%1),eval($1-1)), FOR(eval($1+1),$2,[_P_(T_arg%1),]))>::type type; };
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])dnl
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])
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define([HIDE_OPERATOR],[dnl
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ifelse($2,0,,[dnl
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ifelse($2,1,[dnl
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/** Invokes the wrapped functor ignoring the only argument.
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* @param _A_arg%1 Argument to be ignored.
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* @return The return value of the functor invocation.
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*/
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template <class T_arg1>
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typename deduce_result_type<T_arg1>::type
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operator()(T_arg1)
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{ return this->functor_(); }
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#ifndef SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
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template <class T_arg1>
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typename deduce_result_type<T_arg1>::type
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sun_forte_workaround(T_arg1 _A_a1)
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{ return this->functor_(); }
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#endif
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],$1,0,[dnl
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/** Invokes the wrapped functor ignoring the last argument.dnl
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FOR(1, eval($2-1),[
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* @param _A_arg%1 Argument to be passed on to the functor.])
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* @param _A_arg$2 Argument to be ignored.
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* @return The return value of the functor invocation.
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*/
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template <LOOP([class T_arg%1], $2)>
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typename deduce_result_type<LOOP(T_arg%1, $2)>::type
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operator()(LOOP(T_arg%1 _A_a%1, eval($2-1)), T_arg$2)
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{ return this->functor_.SIGC_WORKAROUND_OPERATOR_PARENTHESES<LIST(FOR(1,eval($2-1),[_P_(T_arg%1),]))>
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(LIST(FOR(1,eval($2-1),[_A_a%1,]))); }
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#ifndef SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
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template <LOOP([class T_arg%1], $2)>
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typename deduce_result_type<LOOP(T_arg%1, $2)>::type
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sun_forte_workaround(LOOP(T_arg%1 _A_a%1, eval($2-1)), T_arg$2)
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{ return this->functor_.SIGC_WORKAROUND_OPERATOR_PARENTHESES<LIST(FOR(1,eval($2-1),[_P_(T_arg%1),]))>
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(LIST(FOR(1,eval($2-1),[_A_a%1,]))); }
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#endif
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],[dnl
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/** Invokes the wrapped functor ignoring the $1[]th argument.dnl
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FOR(1, eval($1-1),[
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* @param _A_arg%1 Argument to be passed on to the functor.])
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* @param _A_arg$1 Argument to be ignored.dnl
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FOR(eval($1+1), $2,[
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* @param _A_arg%1 Argument to be passed on to the functor.])
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* @return The return value of the functor invocation.
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*/
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template <LOOP([class T_arg%1], $2)>
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typename deduce_result_type<LOOP(T_arg%1, $2)>::type
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operator()(LIST(FOR(1,eval($1-1),[T_arg%1 _A_a%1,]),T_arg$1,FOR(eval($1+1),$2,[T_arg%1 _A_a%1,])))
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{ return this->functor_.SIGC_WORKAROUND_OPERATOR_PARENTHESES<LIST(FOR(1,eval($1-1),[_P_(T_arg%1),]),FOR(eval($1+1), $2,[_P_(T_arg%1),]))>
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(LIST(FOR(1,eval($1-1),[_A_a%1,]),FOR(eval($1+1),$2,[_A_a%1,]))); }
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#ifndef SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
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template <LOOP([class T_arg%1], $2)>
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typename deduce_result_type<LOOP(T_arg%1, $2)>::type
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sun_forte_workaround(LIST(FOR(1,eval($1-1),[T_arg%1 _A_a%1,]),T_arg$1,FOR(eval($1+1),$2,[T_arg%1 _A_a%1,])))
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{ return this->functor_.SIGC_WORKAROUND_OPERATOR_PARENTHESES<LIST(FOR(1,eval($1-1),[_P_(T_arg%1),]),FOR(eval($1+1), $2,[_P_(T_arg%1),]))>
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(LIST(FOR(1,eval($1-1),[_A_a%1,]),FOR(eval($1+1),$2,[_A_a%1,]))); }
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#endif
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])])dnl
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])
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define([HIDE_FUNCTOR],[dnl
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/** Adaptor that adds a dummy parameter to the wrapped functor.
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* This template specialization ignores the value of the ifelse($1,-1,[last],[$1[]th]) parameter in operator()().
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*
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* @ingroup hide
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*/
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template <class T_functor>
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struct hide_functor <$1, T_functor> : public adapts<T_functor>
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{
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typedef typename adapts<T_functor>::adaptor_type adaptor_type;
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DEDUCE_RESULT_TYPE(eval($1+1),CALL_SIZE)dnl
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typedef typename adaptor_type::result_type result_type;
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FOR(eval($1+1),CALL_SIZE,[[HIDE_OPERATOR(eval($1+1),%1)]])dnl
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/** Constructs a hide_functor object that adds a dummy parameter to the passed functor.
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* @param _A_functor Functor to invoke from operator()().
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*/
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explicit hide_functor(const T_functor& _A_func)
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: adapts<T_functor>(_A_func)
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{}
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};
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])
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divert(0)dnl
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__FIREWALL__
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#include <sigc++/adaptors/adaptor_trait.h>
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namespace sigc {
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/** @defgroup hide hide(), hide_return()
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* sigc::hide() alters an arbitrary functor in that it adds a parameter
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* whose value is ignored on invocation of the returned functor.
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* Thus you can discard one or more of the arguments of a signal.
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*
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* You may optionally specify the zero-based position of the parameter
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* to ignore as a template argument. The default is to ignore the last
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* parameter.
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* (A value of @p -1 adds a parameter at the end so sigc::hide<-1>() gives the same result as sigc::hide().)
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*
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* The type of the parameter can optionally be specified if not deduced.
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*
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* @par Examples:
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* @code
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* void foo(int, int);
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* // single argument hiding ...
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* sigc::hide(&foo)(1,2,3); // adds a dummy parameter at the back and calls foo(1,2)
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* sigc::hide<-1>(&foo)(1,2,3); // same as sigc::hide(&foo)(1,2,3) (calls foo(1,2))
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* sigc::hide<0>(&foo)(1,2,3); // adds a dummy parameter at the beginning and calls foo(2,3)
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* sigc::hide<1>(&foo)(1,2,3); // adds a dummy parameter in the middle and calls foo(1,3)
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* sigc::hide<2>(&foo)(1,2,3); // adds a dummy parameter at the back and calls foo(1,2)
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* // multiple argument hiding ...
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* sigc::hide(sigc::hide(&foo))(1,2,3,4); // adds two dummy parameters at the back and calls foo(1,2)
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* @endcode
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*
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* The functor sigc::hide() returns can be passed into
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* sigc::signal::connect() directly.
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*
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* @par Example:
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* @code
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* sigc::signal<void,int> some_signal;
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* void foo();
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* some_signal.connect(sigc::hide(&foo));
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* @endcode
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*
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* sigc::hide_return() alters an arbitrary functor by
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* dropping its return value, thus converting it to a void functor.
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*
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* For a more powerful version of this functionality see the lambda
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* library adaptor sigc::group() which can bind, hide and reorder
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* arguments arbitrarily. Although sigc::group() is more flexible,
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* sigc::hide() provides a means of hiding parameters when then total
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* number of parameters called is variable.
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*
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* @ingroup adaptors
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*/
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/** Adaptor that adds a dummy parameter to the wrapped functor.
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* Use the convenience function sigc::hide() to create an instance of sigc::hide_functor.
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*
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* The following template arguments are used:
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* - @e I_location Zero-based position of the dummy parameter (@p -1 for the last parameter).
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* - @e T_type Type of the dummy parameter.
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* - @e T_functor Type of the functor to wrap.
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*
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* @ingroup hide
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*/
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template <int I_location, class T_functor>
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struct hide_functor;
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FOR(-1,eval(CALL_SIZE-1),[[HIDE_FUNCTOR(%1)]])dnl
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//template specialization of visit_each<>(action, functor):
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/** Performs a functor on each of the targets of a functor.
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* The function overload for sigc::hide_functor performs a functor on the
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* functor stored in the sigc::hide_functor object.
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*
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* @ingroup hide
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*/
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template <class T_action, int I_location, class T_functor>
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void visit_each(const T_action& _A_action,
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const hide_functor<I_location, T_functor>& _A_target)
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{
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visit_each(_A_action, _A_target.functor_);
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}
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/** Creates an adaptor of type sigc::hide_functor which adds a dummy parameter to the passed functor.
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* The optional template argument @e I_location specifies the zero-based
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* position of the dummy parameter in the returned functor (@p -1 stands for the last parameter).
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*
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* @param _A_func Functor that should be wrapped.
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* @return Adaptor that executes @e _A_func ignoring the value of the dummy parameter.
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*
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* @ingroup hide
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*/
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template <int I_location, class T_functor>
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inline hide_functor<I_location, T_functor>
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hide(const T_functor& _A_func)
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{ return hide_functor<I_location, T_functor>(_A_func); }
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/** Creates an adaptor of type sigc::hide_functor which adds a dummy parameter to the passed functor.
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* This overload adds a dummy parameter at the back of the functor's parameter list.
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*
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* @param _A_func Functor that should be wrapped.
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* @return Adaptor that executes @e _A_func ignoring the value of the last parameter.
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*
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* @ingroup hide
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*/
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template <class T_functor>
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inline hide_functor<-1, T_functor>
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hide(const T_functor& _A_func)
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{ return hide_functor<-1, T_functor> (_A_func); }
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} /* namespace sigc */
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