273 lines
7.1 KiB
C++
273 lines
7.1 KiB
C++
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// Boost.TypeErasure library
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//
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// Copyright 2011 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: check_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_CHECK_MATCH_HPP_INCLUDED
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#define BOOST_TYPE_ERASURE_CHECK_MATCH_HPP_INCLUDED
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#include <boost/mpl/vector.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/is_sequence.hpp>
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#include <boost/mpl/find_if.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/mpl/end.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/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/detail/access.hpp>
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namespace boost {
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namespace type_erasure {
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template<class T>
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struct typeid_;
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template<class Concept>
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class binding;
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namespace detail {
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template<class P, class T, class Table>
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bool maybe_check_table(const T& arg, const Table*& table, boost::mpl::true_)
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{
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if(table == 0) {
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table = &::boost::type_erasure::detail::access::table(arg);
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return true;
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} else {
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return table->template find< ::boost::type_erasure::typeid_<P> >()() ==
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::boost::type_erasure::detail::access::table(arg).
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template find< ::boost::type_erasure::typeid_<P> >()();
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}
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}
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template<class P, class T, class Table>
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bool maybe_check_table(const T&, const Table*&, boost::mpl::false_)
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{
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return true;
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}
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template<class Concept, class T>
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struct should_check :
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boost::mpl::and_<
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::boost::type_erasure::is_placeholder<T>,
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::boost::type_erasure::is_relaxed<Concept>
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>
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{};
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}
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#ifdef BOOST_TYPE_ERASURE_DOXYGEN
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/**
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* If @ref relaxed is in @c Concept, checks whether the
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* arguments to @c f match the types specified by
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* @c binding. If @ref relaxed is not in @c Concept,
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* returns true. If @c binding is not specified, it will
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* be deduced from the arguments.
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*/
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template<class Concept, class Op, class... U>
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bool check_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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bool check_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>
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bool check_table(const ::boost::type_erasure::binding<Concept>* t, void(*)())
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{
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return true;
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}
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template<class Concept, class R, class T0, class... T, class U0, class... U>
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bool check_table(
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const ::boost::type_erasure::binding<Concept>* t,
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R(*)(T0, T...),
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const U0& arg0,
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const U&... arg)
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{
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typedef typename ::boost::remove_cv<
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typename ::boost::remove_reference<T0>::type
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>::type t0;
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if(!::boost::type_erasure::detail::maybe_check_table<t0>(
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arg0,
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t,
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::boost::type_erasure::detail::should_check<Concept, t0>()))
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return false;
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return check_table(t, static_cast<void(*)(T...)>(0), arg...);
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}
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}
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template<class Concept, class Op, class... U>
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bool check_match(
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const ::boost::type_erasure::binding<Concept>& table,
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const Op&,
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U&&... arg)
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{
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return ::boost::type_erasure::detail::check_table(
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&table,
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static_cast<typename ::boost::type_erasure::detail::get_signature<Op>::type*>(0),
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arg...);
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}
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template<
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class Op,
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class... U
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>
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bool check_match(
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const Op&,
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U&&... arg)
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{
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const ::boost::type_erasure::binding<
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typename ::boost::type_erasure::detail::extract_concept<
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typename ::boost::type_erasure::detail::get_signature<Op>::type, U...>::type>* p = 0;
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return ::boost::type_erasure::detail::check_table(
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p, static_cast<typename ::boost::type_erasure::detail::get_signature<Op>::type*>(0), arg...);
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}
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#else
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#define BOOST_PP_FILENAME_1 <boost/type_erasure/check_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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namespace detail {
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#define N BOOST_PP_ITERATION()
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#define BOOST_TYPE_ERASURE_CHECK_TABLE(z, n, data) \
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typedef typename ::boost::remove_cv< \
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typename ::boost::remove_reference<BOOST_PP_CAT(T, n)>::type \
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>::type BOOST_PP_CAT(t, n); \
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if(!::boost::type_erasure::detail::maybe_check_table<BOOST_PP_CAT(t, n)>( \
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BOOST_PP_CAT(arg, n), \
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t, \
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::boost::type_erasure::detail::should_check<Concept, BOOST_PP_CAT(t, n)>())) \
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return false;
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template<
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class Concept,
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class R
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class T)
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)>
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bool
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BOOST_PP_CAT(check_table, N)(
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const ::boost::type_erasure::binding<Concept>* t,
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R (*)(BOOST_PP_ENUM_PARAMS(N, T))
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, const U, &arg))
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{
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BOOST_PP_REPEAT(N, BOOST_TYPE_ERASURE_CHECK_TABLE, ~)
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return true;
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}
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#if N != 0
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template<class Sig BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)>
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struct BOOST_PP_CAT(do_extract_concept, N);
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template<
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class R
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class T)
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BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)
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>
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struct BOOST_PP_CAT(do_extract_concept, N)<
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R(BOOST_PP_ENUM_PARAMS(N, T))
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BOOST_PP_ENUM_TRAILING_PARAMS(N, U)
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>
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: ::boost::type_erasure::detail::BOOST_PP_CAT(extract_concept, N)<
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BOOST_PP_ENUM_PARAMS(N, T)
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BOOST_PP_ENUM_TRAILING_PARAMS(N, U)>
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{};
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#endif
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}
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#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
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#define RREF &
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#else
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#define RREF &&
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#endif
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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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bool check_match(
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const ::boost::type_erasure::binding<Concept>& table,
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const Op&
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, U, RREF arg))
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{
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return ::boost::type_erasure::detail::BOOST_PP_CAT(check_table, N)(
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&table,
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(typename ::boost::type_erasure::detail::get_signature<Op>::type*)0
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BOOST_PP_ENUM_TRAILING_PARAMS(N, 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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bool check_match(
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const Op&
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, U, RREF arg))
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{
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const ::boost::type_erasure::binding<
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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>* p = 0;
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return ::boost::type_erasure::detail::BOOST_PP_CAT(check_table, N)(
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p,
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(typename ::boost::type_erasure::detail::get_signature<Op>::type*)0
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BOOST_PP_ENUM_TRAILING_PARAMS(N, arg));
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}
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#undef RREF
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#undef BOOST_TYPE_ERASURE_CHECK_TABLE
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#undef N
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#endif
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#endif
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