| /*============================================================================= |
| Copyright (c) 2003 Jonathan de Halleux (dehalleux@pelikhan.com) |
| http://spirit.sourceforge.net/ |
| |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| =============================================================================*/ |
| #ifndef BOOST_SPIRIT_ACTOR_DECREMENT_ACTOR_HPP |
| #define BOOST_SPIRIT_ACTOR_DECREMENT_ACTOR_HPP |
| |
| #include <boost/spirit/home/classic/namespace.hpp> |
| #include <boost/spirit/home/classic/actor/ref_actor.hpp> |
| |
| namespace boost { namespace spirit { |
| |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Summary: |
| // A semantic action policy that calls the -- operator on a reference. |
| // (This doc uses convention available in actors.hpp) |
| // |
| // Actions: |
| // --ref; |
| // |
| // Policy name: |
| // decrement_action |
| // |
| // Policy holder, corresponding helper method: |
| // ref_actor, decrement_a( ref ); |
| // |
| // () operators: both. |
| // |
| // See also ref_actor for more details. |
| /////////////////////////////////////////////////////////////////////////// |
| struct decrement_action |
| { |
| template< |
| typename T |
| > |
| void act(T& ref_) const |
| { |
| --ref_; |
| } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // helper method that creates a and_assign_actor. |
| /////////////////////////////////////////////////////////////////////////// |
| template<typename T> |
| inline ref_actor<T,decrement_action> decrement_a(T& ref_) |
| { |
| return ref_actor<T,decrement_action>(ref_); |
| } |
| |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_END |
| |
| }} |
| |
| #endif |