107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
|
|
||
|
|
// (C) Copyright Edward Diener 2011,2012,2013
|
||
|
|
// Use, modification and distribution are subject to 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(BOOST_TTI_HAS_MEMBER_DATA_HPP)
|
||
|
|
#define BOOST_TTI_HAS_MEMBER_DATA_HPP
|
||
|
|
|
||
|
|
#include <boost/config.hpp>
|
||
|
|
#include <boost/preprocessor/cat.hpp>
|
||
|
|
#include <boost/tti/detail/ddeftype.hpp>
|
||
|
|
#include <boost/tti/detail/dmem_data.hpp>
|
||
|
|
#include <boost/tti/gen/has_member_data_gen.hpp>
|
||
|
|
|
||
|
|
/*
|
||
|
|
|
||
|
|
The succeeding comments in this file are in doxygen format.
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
/** \file
|
||
|
|
*/
|
||
|
|
|
||
|
|
/// Expands to a metafunction which tests whether a member data with a particular name and type exists.
|
||
|
|
/**
|
||
|
|
|
||
|
|
trait = the name of the metafunction.
|
||
|
|
|
||
|
|
name = the name of the inner member to introspect.
|
||
|
|
|
||
|
|
generates a metafunction called "trait" where 'trait' is the macro parameter.
|
||
|
|
|
||
|
|
template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE>
|
||
|
|
struct trait
|
||
|
|
{
|
||
|
|
static const value = unspecified;
|
||
|
|
typedef mpl::bool_<true-or-false> type;
|
||
|
|
};
|
||
|
|
|
||
|
|
The metafunction types and return:
|
||
|
|
|
||
|
|
BOOST_TTI_TP_ET = the enclosing type in which to look for our 'name'
|
||
|
|
OR
|
||
|
|
The type of the member data in the form of a pointer
|
||
|
|
to member data.
|
||
|
|
|
||
|
|
BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first
|
||
|
|
parameter is the enclosing type.
|
||
|
|
|
||
|
|
returns = 'value' is true if the 'name' exists, with the correct data type,
|
||
|
|
otherwise 'value' is false.
|
||
|
|
|
||
|
|
*/
|
||
|
|
#define BOOST_TTI_TRAIT_HAS_MEMBER_DATA(trait,name) \
|
||
|
|
BOOST_TTI_DETAIL_TRAIT_HAS_MEMBER_DATA(trait,name) \
|
||
|
|
template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE = BOOST_TTI_NAMESPACE::detail::deftype> \
|
||
|
|
struct trait \
|
||
|
|
{ \
|
||
|
|
typedef typename \
|
||
|
|
BOOST_PP_CAT(trait,_detail_hmd) \
|
||
|
|
< \
|
||
|
|
BOOST_TTI_TP_ET, \
|
||
|
|
BOOST_TTI_TP_TYPE \
|
||
|
|
>::type type; \
|
||
|
|
BOOST_STATIC_CONSTANT(bool,value=type::value); \
|
||
|
|
}; \
|
||
|
|
/**/
|
||
|
|
|
||
|
|
/// Expands to a metafunction which tests whether a member data with a particular name and type exists.
|
||
|
|
/**
|
||
|
|
|
||
|
|
name = the name of the inner member.
|
||
|
|
|
||
|
|
generates a metafunction called "has_member_data_name" where 'name' is the macro parameter.
|
||
|
|
|
||
|
|
template<class BOOST_TTI_TP_ET,class BOOST_TTI_TP_TYPE>
|
||
|
|
struct has_member_data_name
|
||
|
|
{
|
||
|
|
static const value = unspecified;
|
||
|
|
typedef mpl::bool_<true-or-false> type;
|
||
|
|
};
|
||
|
|
|
||
|
|
The metafunction types and return:
|
||
|
|
|
||
|
|
BOOST_TTI_TP_ET = the enclosing type in which to look for our 'name'
|
||
|
|
OR
|
||
|
|
The type of the member data in the form of a pointer
|
||
|
|
to member data.
|
||
|
|
|
||
|
|
BOOST_TTI_TP_TYPE = (optional) The type of the member data if the first
|
||
|
|
parameter is the enclosing type.
|
||
|
|
|
||
|
|
returns = 'value' is true if the 'name' exists, with the correct data type,
|
||
|
|
otherwise 'value' is false.
|
||
|
|
|
||
|
|
*/
|
||
|
|
#define BOOST_TTI_HAS_MEMBER_DATA(name) \
|
||
|
|
BOOST_TTI_TRAIT_HAS_MEMBER_DATA \
|
||
|
|
( \
|
||
|
|
BOOST_TTI_HAS_MEMBER_DATA_GEN(name), \
|
||
|
|
name \
|
||
|
|
) \
|
||
|
|
/**/
|
||
|
|
|
||
|
|
#endif // BOOST_TTI_HAS_MEMBER_DATA_HPP
|