262 lines
6.7 KiB
C++
262 lines
6.7 KiB
C++
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// Boost.TypeErasure library
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//
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// Copyright 2011-2012 Steven Watanabe
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//
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// Distributed under the Boost Software License Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// $Id: require_match.hpp 83251 2013-03-02 19:23:44Z steven_watanabe $
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#if !defined(BOOST_PP_IS_ITERATING)
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#ifndef BOOST_TYPE_ERASURE_REQUIRE_MATCH_HPP_INCLUDED
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#define BOOST_TYPE_ERASURE_REQUIRE_MATCH_HPP_INCLUDED
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#include <boost/throw_exception.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/facilities/intercept.hpp>
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#include <boost/preprocessor/iteration/iterate.hpp>
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#include <boost/preprocessor/repetition/repeat.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_binary_params.hpp>
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#include <boost/type_erasure/detail/extract_concept.hpp>
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#include <boost/type_erasure/relaxed.hpp>
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#include <boost/type_erasure/check_match.hpp>
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#include <boost/type_erasure/exception.hpp>
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namespace boost {
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namespace type_erasure {
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template<class Concept>
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class binding;
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#ifdef BOOST_TYPE_ERASURE_DOXYGEN
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/**
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* Checks that the actual types stored in all the @ref any
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* arguments match the types specified by @c binding. If
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* they do not match then,
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* - If @ref relaxed is in @c Concept, throws @ref bad_function_call.
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* - Otherwise the behavior is undefined.
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*
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* If @c binding is not specified, it will be deduced from
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* the arguments.
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*
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* \post \call<code>(binding, f, args...)</code> is valid.
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*/
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template<class Concept, class Op, class... U>
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void require_match(const binding<Concept>& binding_arg, const Op& f, U&&... args);
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/**
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* \overload
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*/
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template<class Op, class... U>
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void require_match(const Op& f, U&&... args);
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#else
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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namespace detail {
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template<class Concept, class Op, class... U>
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void require_match_impl(
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::boost::mpl::true_,
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const ::boost::type_erasure::binding<Concept>& table,
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const Op& op,
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U&&... arg)
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{
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if(!::boost::type_erasure::check_match(table, op, std::forward<U>(arg)...)) {
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BOOST_THROW_EXCEPTION(::boost::type_erasure::bad_function_call());
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}
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}
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template<class Concept, class Op, class... U>
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void require_match_impl(
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::boost::mpl::false_,
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const ::boost::type_erasure::binding<Concept>&,
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const Op&,
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U&&...)
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{}
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template<class Op, class... U>
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void require_match_impl(
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::boost::mpl::true_,
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const Op& op,
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U&&... arg)
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{
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if(!::boost::type_erasure::check_match(op, ::std::forward<U>(arg)...)) {
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BOOST_THROW_EXCEPTION(::boost::type_erasure::bad_function_call());
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}
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}
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template<class Op, class... U>
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void require_match_impl(
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::boost::mpl::false_,
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const Op&,
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U&&...)
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{}
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}
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template<class Concept, class Op, class... U>
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void require_match(
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const ::boost::type_erasure::binding<Concept>& table,
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const Op& op,
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U&&... arg)
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{
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::boost::type_erasure::is_relaxed<Concept> cond;
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::boost::type_erasure::detail::require_match_impl(cond, table, op, ::std::forward<U>(arg)...);
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}
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template<class Op, class... U>
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void require_match(
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const Op& op,
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U&&... arg)
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{
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::boost::type_erasure::is_relaxed<
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typename ::boost::type_erasure::detail::extract_concept<
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typename ::boost::type_erasure::detail::get_signature<Op>::type,
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U...>::type
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> cond;
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::boost::type_erasure::detail::require_match_impl(cond, op, ::std::forward<U>(arg)...);
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}
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#else
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#define BOOST_PP_FILENAME_1 <boost/type_erasure/require_match.hpp>
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#define BOOST_PP_ITERATION_LIMITS (0, BOOST_TYPE_ERASURE_MAX_ARITY)
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#include BOOST_PP_ITERATE()
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#endif
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#endif
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}
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}
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#endif
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#else
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#define N BOOST_PP_ITERATION()
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#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
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#define RREF &
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#define BOOST_TYPE_ERASURE_FORWARD_ARGS(N, X, x) BOOST_PP_ENUM_TRAILING_PARAMS(N, x)
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#else
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#define RREF &&
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#define BOOST_TYPE_ERASURE_FORWARD_ARGS_I(z, n, data) std::forward<BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(2, 0, data), n)>(BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(2, 1, data), n))
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#define BOOST_TYPE_ERASURE_FORWARD_ARGS(N, X, x) BOOST_PP_ENUM_TRAILING(N, BOOST_TYPE_ERASURE_FORWARD_ARGS_I, (X, x))
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#endif
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namespace detail {
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template<
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class Concept,
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class Op
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)
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>
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void require_match_impl(
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::boost::mpl::true_,
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const ::boost::type_erasure::binding<Concept>& table,
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const Op& op
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, U, RREF arg))
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{
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if(!::boost::type_erasure::check_match
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(table, op BOOST_TYPE_ERASURE_FORWARD_ARGS(N, U, arg))) {
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BOOST_THROW_EXCEPTION(::boost::type_erasure::bad_function_call());
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}
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}
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template<
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class Concept,
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class Op
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)
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>
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void require_match_impl(
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::boost::mpl::false_,
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const ::boost::type_erasure::binding<Concept>&,
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const Op&
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, U, RREF BOOST_PP_INTERCEPT))
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{}
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#if N != 0
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template<
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class Op
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)
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>
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void require_match_impl(
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::boost::mpl::true_,
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const Op& op
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, U, RREF arg))
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{
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if(!::boost::type_erasure::check_match
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(op BOOST_TYPE_ERASURE_FORWARD_ARGS(N, U, arg))) {
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BOOST_THROW_EXCEPTION(::boost::type_erasure::bad_function_call());
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}
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}
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template<
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class Op
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)
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>
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void require_match_impl(
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::boost::mpl::false_,
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const Op&
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, U, RREF BOOST_PP_INTERCEPT))
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{}
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#endif
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}
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template<
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class Concept,
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class Op
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)
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>
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void require_match(
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const ::boost::type_erasure::binding<Concept>& table,
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const Op& op
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, U, RREF arg))
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{
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::boost::type_erasure::is_relaxed<Concept> cond;
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::boost::type_erasure::detail::require_match_impl
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(cond, table, op BOOST_TYPE_ERASURE_FORWARD_ARGS(N, U, arg));
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}
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#if N != 0
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template<
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class Op
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)
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>
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void require_match(
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const Op& op
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, U, RREF arg))
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{
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::boost::type_erasure::is_relaxed<
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typename ::boost::type_erasure::detail::BOOST_PP_CAT(do_extract_concept, N)<
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typename ::boost::type_erasure::detail::get_signature<Op>::type,
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BOOST_PP_ENUM_PARAMS(N, U)>::type
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> cond;
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::boost::type_erasure::detail::require_match_impl
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(cond, op BOOST_TYPE_ERASURE_FORWARD_ARGS(N, U, arg));
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}
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#endif
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#undef RREF
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#undef BOOST_TYPE_ERASURE_FORWARD_ARGS
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#undef BOOST_TYPE_ERASURE_FORWARD_ARGS_I
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#undef N
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#endif
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