129 lines
4.0 KiB
C++
129 lines
4.0 KiB
C++
// -*- c++ -*-
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/*
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* Copyright 2002, The libsigc++ Development Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef _SIGC_VISIT_EACH_HPP_
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#define _SIGC_VISIT_EACH_HPP_
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#include <sigc++/type_traits.h>
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namespace sigc {
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namespace internal {
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/// Helper struct for visit_each_type().
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template <class T_target, class T_action>
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struct limit_derived_target
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{
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typedef limit_derived_target<T_target, T_action> T_self;
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template <bool I_derived, class T_type> struct with_type;
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template <class T_type> struct with_type<false,T_type>
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{ static void execute_(const T_type&, const T_self&) {} };
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template <class T_type> struct with_type<true,T_type>
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{ static void execute_(const T_type& _A_type, const T_self& _A_action)
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{ _A_action.action_(_A_type); }
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};
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template <class T_type>
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void operator()(const T_type& _A_type) const
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{ with_type<is_base_and_derived<T_target,T_type>::value,T_type>::execute_(_A_type,*this); }
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limit_derived_target(const T_action& _A_action): action_(_A_action) {}
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T_action action_;
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};
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/// Helper struct for visit_each_type().
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template <class T_target, class T_action>
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struct limit_derived_target<T_target*, T_action>
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{
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typedef limit_derived_target<T_target*, T_action> T_self;
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template <bool I_derived, class T_type> struct with_type;
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template <class T_type> struct with_type<false,T_type>
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{ static void execute_(const T_type&, const T_self&) {} };
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template <class T_type> struct with_type<true,T_type>
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{ static void execute_(const T_type& _A_type, const T_self& _A_action)
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{ _A_action.action_(&_A_type); }
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};
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template <class T_type>
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void operator()(const T_type& _A_type) const
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{ with_type<is_base_and_derived<T_target,T_type>::value,T_type>::execute_(_A_type,*this); }
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limit_derived_target(const T_action& _A_action): action_(_A_action) {}
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T_action action_;
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};
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} /* namespace internal */
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/** This function performs a functor on each of the targets of a functor.
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* All unknown types just call @e _A_action on them.
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* Add overloads that specialize the @e T_functor argument for your own
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* functor types, so that subobjects get visited. This is needed to enable
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* auto-disconnection support for your functor types.
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*
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* @par Example:
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* @code
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* struct some_functor
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* {
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* void operator()() {}
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* some_possibly_sigc_trackable_derived_type some_data_member;
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* some_other_functor_type some_other_functor;
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* }
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*
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* namespace sigc
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* {
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* template <class T_action>
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* void visit_each(const T_action& _A_action,
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* const some_functor& _A_target)
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* {
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* visit_each(_A_action, _A_target.some_data_member);
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* visit_each(_A_action, _A_target.some_other_functor);
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* }
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* }
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* @endcode
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*
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* @ingroup functors
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*/
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template <class T_action, class T_functor>
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void visit_each(const T_action& _A_action, const T_functor& _A_functor)
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{ _A_action(_A_functor); }
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/** This function performs a functor on each of the targets
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* of a functor limited to a restricted type.
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*
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* @ingroup functors
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*/
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template <class T_type, class T_action, class T_functor>
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void visit_each_type(const T_action& _A_action, const T_functor& _A_functor)
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{
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internal::limit_derived_target<T_type,T_action> limited_action(_A_action);
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visit_each(limited_action,_A_functor);
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}
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} /* namespace sigc */
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#endif
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