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#if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
#include <boost/proto/context/detail/preprocessed/callable_eval.hpp>
#elif !defined(BOOST_PP_IS_ITERATING)
#define BOOST_PROTO_CHILD_N_TYPE(Z, N, Expr) \
typedef typename proto::result_of::child_c<Expr const &, N>::type BOOST_PP_CAT(child, N); \
/**/
#define BOOST_PROTO_CHILD_N(Z, N, expr) \
proto::child_c<N>(expr) \
/**/
#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
#pragma wave option(preserve: 2, line: 0, output: "preprocessed/callable_eval.hpp")
#endif
///////////////////////////////////////////////////////////////////////////////
/// \file callable_eval.hpp
/// Contains specializations of the callable_eval\<\> class template.
//
// Copyright 2008 Eric Niebler. 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)
#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
#pragma wave option(preserve: 1)
#endif
#define BOOST_PP_ITERATION_PARAMS_1 \
(3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/context/detail/callable_eval.hpp>))
#include BOOST_PP_ITERATE()
#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
#pragma wave option(output: null)
#endif
#undef BOOST_PROTO_CHILD_N_TYPE
#undef BOOST_PROTO_CHILD_N
#else
#define N BOOST_PP_ITERATION()
namespace detail
{
template<typename Expr, typename Context>
struct is_expr_handled<Expr, Context, N>
{
static callable_context_wrapper<Context> &sctx_;
static Expr &sexpr_;
static typename Expr::proto_tag &stag_;
static const bool value =
sizeof(yes_type) ==
sizeof(
detail::check_is_expr_handled(
(sctx_(
stag_
BOOST_PP_ENUM_TRAILING(N, BOOST_PROTO_CHILD_N, sexpr_)
), 0)
)
);
typedef mpl::bool_<value> type;
};
}
namespace context
{
/// \brief A BinaryFunction that accepts a Proto expression and a
/// callable context and calls the context with the expression tag
/// and children as arguments, effectively fanning the expression
/// out.
///
/// <tt>callable_eval\<\></tt> requires that \c Context is a
/// PolymorphicFunctionObject that can be invoked with \c Expr's
/// tag and children as expressions, as follows:
///
/// \code
/// context(Expr::proto_tag(), child_c\<0\>(expr), child_c\<1\>(expr), ...)
/// \endcode
template<typename Expr, typename Context>
struct callable_eval<Expr, Context, N>
{
BOOST_PP_REPEAT(N, BOOST_PROTO_CHILD_N_TYPE, Expr)
typedef
typename BOOST_PROTO_RESULT_OF<
Context(
typename Expr::proto_tag
BOOST_PP_ENUM_TRAILING_PARAMS(N, child)
)
>::type
result_type;
/// \param expr The current expression
/// \param context The callable evaluation context
/// \return <tt>context(Expr::proto_tag(), child_c\<0\>(expr), child_c\<1\>(expr), ...)</tt>
result_type operator ()(Expr &expr, Context &context) const
{
return context(
typename Expr::proto_tag()
BOOST_PP_ENUM_TRAILING(N, BOOST_PROTO_CHILD_N, expr)
);
}
};
}
#undef N
#endif
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