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