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/src/contrib/boost/spirit/home/classic/actor/assign_actor.hpp

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  1/*=============================================================================
  2    Copyright (c) 2003 Jonathan de Halleux (dehalleux@pelikhan.com)
  3    http://spirit.sourceforge.net/
  4
  5  Distributed under the Boost Software License, Version 1.0. (See accompanying
  6  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  7=============================================================================*/
  8#ifndef BOOST_SPIRIT_ACTOR_ASSIGN_ACTOR_HPP
  9#define BOOST_SPIRIT_ACTOR_ASSIGN_ACTOR_HPP
 10
 11#include <boost/spirit/home/classic/namespace.hpp>
 12#include <boost/spirit/home/classic/actor/ref_value_actor.hpp>
 13#include <boost/spirit/home/classic/actor/ref_const_ref_actor.hpp>
 14
 15namespace boost { namespace spirit {
 16
 17BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
 18
 19    ///////////////////////////////////////////////////////////////////////////
 20    //  Summary:
 21    //  A semantic action policy that applies the assignement operator.
 22    //  (This doc uses convention available in actors.hpp)
 23    //
 24    //  Actions (what it does):
 25    //      ref = value;
 26    //      ref = T(first,last);
 27    //      ref = value_ref;
 28    //
 29    //  Policy name:
 30    //      assign_action
 31    //
 32    //  Policy holder, corresponding helper method:
 33    //      ref_value_actor, assign_a( ref );
 34    //      ref_const_ref_actor, assign_a( ref, value_ref );
 35    //
 36    //  () operators: both
 37    //
 38    //  See also ref_value_actor and ref_const_ref_actor for more details.
 39    ///////////////////////////////////////////////////////////////////////////
 40    struct assign_action
 41    {
 42        template<
 43            typename T,
 44            typename ValueT
 45        >
 46        void act(T& ref_, ValueT const& value_) const
 47        {
 48            ref_ = value_;
 49        }
 50        template<
 51            typename T,
 52            typename IteratorT
 53        >
 54        void act(
 55            T& ref_,
 56            IteratorT const& first_,
 57            IteratorT const& last_
 58            ) const
 59        {
 60            typedef T value_type;
 61#ifndef BOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS
 62            value_type value(first_,last_);
 63#else
 64            value_type value;
 65            std::copy(first_, last_, std::inserter(value, value.end()));
 66#endif
 67            ref_ = value;
 68        }
 69    };
 70
 71    // Deprecated. Please use assign_a
 72    template<typename T>
 73    inline ref_value_actor<T,assign_action> assign(T& ref_)
 74    {
 75        return ref_value_actor<T,assign_action>(ref_);
 76    }
 77
 78    template<typename T>
 79    inline ref_value_actor<T,assign_action> assign_a(T& ref_)
 80    {
 81        return ref_value_actor<T,assign_action>(ref_);
 82    }
 83
 84    template<
 85        typename T,
 86        typename ValueT
 87    >
 88    inline ref_const_ref_actor<T,ValueT,assign_action> assign_a(
 89        T& ref_,
 90        ValueT const& value_
 91    )
 92    {
 93        return ref_const_ref_actor<T,ValueT,assign_action>(ref_,value_);
 94    }
 95
 96BOOST_SPIRIT_CLASSIC_NAMESPACE_END
 97
 98}}
 99
100#endif