237 lines
7.2 KiB
C++
237 lines
7.2 KiB
C++
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/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See 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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/*!
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* \file function_traits.hpp
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* \author Andrey Semashev
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* \date 30.08.2009
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*
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* \brief This header is the Boost.Log library implementation, see the library documentation
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* at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
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*/
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#ifndef BOOST_LOG_DETAIL_FUNCTION_TRAITS_HPP_INCLUDED_
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#define BOOST_LOG_DETAIL_FUNCTION_TRAITS_HPP_INCLUDED_
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#include <boost/mpl/has_xxx.hpp>
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#include <boost/log/detail/config.hpp>
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#if defined(BOOST_NO_SFINAE) || defined(BOOST_MPL_CFG_NO_HAS_XXX)
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# if !defined(BOOST_LOG_NO_FUNCTION_TRAITS)
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# define BOOST_LOG_NO_FUNCTION_TRAITS
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# endif
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#else
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/front.hpp>
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#include <boost/mpl/pop_front.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/function_types/function_arity.hpp>
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#include <boost/function_types/parameter_types.hpp>
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#include <boost/function_types/is_nonmember_callable_builtin.hpp>
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#include <boost/log/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace aux {
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// A number of traits to deal with functors
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BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_argument_type, argument_type, false)
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BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_first_argument_type, first_argument_type, false)
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BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_second_argument_type, second_argument_type, false)
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BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_arg1_type, arg1_type, false)
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BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_arg2_type, arg2_type, false)
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namespace has_arity_no_adl {
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typedef char yes_type;
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struct no_type
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{
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char dummy[2];
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};
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template< typename FunT, int ArityV = FunT::arity >
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struct checker
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{
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};
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template< typename FunT >
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yes_type has_arity_impl(FunT const&, checker< FunT >*);
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template< typename FunT >
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no_type has_arity_impl(FunT const&, ...);
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} // namespace has_arity_no_adl
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//! The metafunction detects if the type has an arity static constant member
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template< typename FunT >
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struct has_arity
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{
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static FunT const& get_FunT();
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enum value_t { value = (sizeof(has_arity_no_adl::has_arity_impl(get_FunT(), 0)) == sizeof(has_arity_no_adl::yes_type)) };
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typedef mpl::bool_< value > type;
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};
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//! The metafunction results in an unqualified type with removed reference
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template< typename T >
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struct root_type :
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public remove_cv<
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typename remove_reference<
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T
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>::type
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>
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{
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};
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template<
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typename FunT,
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bool = function_types::is_nonmember_callable_builtin< FunT >::value,
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bool = has_argument_type< FunT >::value,
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bool = has_first_argument_type< FunT >::value,
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bool = has_arg1_type< FunT >::value
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>
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struct first_argument_type_of_impl
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{
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};
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template< typename FunT >
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struct first_argument_type_of_impl< FunT, true, false, false, false >
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{
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typedef typename root_type<
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typename mpl::front<
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typename function_types::parameter_types< FunT >::type
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>::type
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>::type type;
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};
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template< typename FunT, bool HasFirstArgumentV, bool HasArg1V >
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struct first_argument_type_of_impl< FunT, false, true, HasFirstArgumentV, HasArg1V >
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{
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typedef typename root_type<
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typename FunT::argument_type
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>::type type;
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};
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template< typename FunT, bool HasArg1V >
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struct first_argument_type_of_impl< FunT, false, false, true, HasArg1V >
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{
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typedef typename root_type<
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typename FunT::first_argument_type
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>::type type;
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};
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template< typename FunT >
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struct first_argument_type_of_impl< FunT, false, false, false, true >
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{
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typedef typename root_type<
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typename FunT::arg1_type
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>::type type;
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};
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//! The metafunction returns the first argument type of a function
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template< typename FunT >
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struct first_argument_type_of :
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public first_argument_type_of_impl< FunT >
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{
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};
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template<
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typename FunT,
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bool = function_types::is_nonmember_callable_builtin< FunT >::value,
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bool = has_second_argument_type< FunT >::value,
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bool = has_arg2_type< FunT >::value
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>
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struct second_argument_type_of_impl
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{
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};
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template< typename FunT >
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struct second_argument_type_of_impl< FunT, true, false, false >
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{
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typedef typename root_type<
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typename mpl::front<
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typename mpl::pop_front<
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typename function_types::parameter_types< FunT >::type
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>::type
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>::type
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>::type type;
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};
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template< typename FunT, bool HasArg2V >
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struct second_argument_type_of_impl< FunT, false, true, HasArg2V >
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{
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typedef typename root_type<
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typename FunT::second_argument_type
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>::type type;
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};
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template< typename FunT >
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struct second_argument_type_of_impl< FunT, false, false, true >
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{
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typedef typename root_type<
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typename FunT::arg2_type
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>::type type;
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};
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//! The metafunction returns the second argument type of a function
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template< typename FunT >
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struct second_argument_type_of :
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public second_argument_type_of_impl< FunT >
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{
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};
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template<
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typename FunT,
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bool = function_types::is_nonmember_callable_builtin< FunT >::value,
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bool = has_arity< FunT >::value,
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bool = has_argument_type< FunT >::value,
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bool = has_second_argument_type< FunT >::value
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>
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struct arity_of_impl
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{
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};
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template< typename FunT >
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struct arity_of_impl< FunT, true, false, false, false > :
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public function_types::function_arity< FunT >
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{
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};
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template< typename FunT, bool HasArgumentTypeV, bool HasSecondArgumentTypeV >
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struct arity_of_impl< FunT, false, true, HasArgumentTypeV, HasSecondArgumentTypeV > :
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public mpl::int_< FunT::arity >
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{
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};
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template< typename FunT, bool HasArgumentTypeV >
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struct arity_of_impl< FunT, false, false, HasArgumentTypeV, true > :
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public mpl::int_< 2 >
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{
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};
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template< typename FunT >
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struct arity_of_impl< FunT, false, false, true, false > :
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public mpl::int_< 1 >
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{
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};
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//! The metafunction returns the arity of a function
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template< typename FunT >
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struct arity_of :
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public arity_of_impl< FunT >
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{
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};
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} // namespace aux
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif // defined(BOOST_NO_SFINAE) || defined(BOOST_MPL_CFG_NO_HAS_XXX)
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#endif // BOOST_LOG_DETAIL_FUNCTION_TRAITS_HPP_INCLUDED_
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