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112 lines
3.1 KiB
112 lines
3.1 KiB
/*============================================================================== |
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Copyright (c) 2001-2010 Joel de Guzman |
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Copyright (c) 2010 Thomas Heller |
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Distributed under the Boost Software License, Version 1.0. (See accompanying |
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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==============================================================================*/ |
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#ifndef BOOST_PHOENIX_CORE_VALUE_HPP |
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#define BOOST_PHOENIX_CORE_VALUE_HPP |
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#include <boost/phoenix/core/limits.hpp> |
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#include <boost/phoenix/core/actor.hpp> |
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#include <boost/phoenix/core/as_actor.hpp> |
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#include <boost/phoenix/core/terminal.hpp> |
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#include <boost/utility/result_of.hpp> |
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namespace boost { namespace phoenix |
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{ |
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//////////////////////////////////////////////////////////////////////////// |
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// |
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// values |
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// |
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// function for evaluating values, e.g. val(123) |
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// |
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//////////////////////////////////////////////////////////////////////////// |
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namespace expression |
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{ |
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template <typename T> |
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struct value |
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: expression::terminal<T> |
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{}; |
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} |
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template <typename T> |
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typename expression::value<T>::type const |
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inline val(T t) |
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{ |
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return expression::value<T>::make(t); |
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} |
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// Call out actor for special handling |
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template<typename Expr> |
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struct is_custom_terminal<actor<Expr> > |
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: mpl::true_ |
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{}; |
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// Special handling for actor |
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template<typename Expr> |
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struct custom_terminal<actor<Expr> > |
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{ |
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template <typename Sig> |
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struct result; |
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template <typename This, typename Actor, typename Context> |
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struct result<This(Actor, Context)> |
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: boost::remove_const< |
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typename boost::remove_reference< |
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typename evaluator::impl<Actor, Context, int>::result_type |
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>::type |
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> |
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{}; |
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template <typename Context> |
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typename result<custom_terminal(actor<Expr> const &, Context &)>::type |
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operator()(actor<Expr> const & expr, Context & ctx) const |
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{ |
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return boost::phoenix::eval(expr, ctx); |
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} |
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}; |
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namespace meta |
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{ |
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template<typename T> |
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struct const_ref |
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: add_reference<typename add_const<T>::type> |
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{}; |
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template<typename T> |
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struct argument_type |
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: mpl::eval_if_c< |
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is_function<typename remove_pointer<T>::type>::value |
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, mpl::identity<T> |
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, const_ref<T> |
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> |
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{ |
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typedef T type; |
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}; |
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template <typename T> |
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struct decay |
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{ |
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typedef T type; |
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}; |
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template <typename T, int N> |
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struct decay<T[N]> : decay<T const *> {}; |
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} |
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template <typename T> |
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struct as_actor<T, mpl::false_> |
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{ |
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typedef typename expression::value<typename meta::decay<T>::type >::type type; |
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static type |
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convert(typename meta::argument_type<typename meta::decay<T>::type>::type t) |
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{ |
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return expression::value<typename meta::decay<T>::type >::make(t); |
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} |
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}; |
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}} |
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#endif
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