110 lines
4.2 KiB
C++
110 lines
4.2 KiB
C++
|
|
||
|
|
// (C) Copyright Edward Diener 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_FUNCTION_HPP)
|
||
|
|
#define BOOST_TTI_HAS_FUNCTION_HPP
|
||
|
|
|
||
|
|
#include <boost/config.hpp>
|
||
|
|
#include <boost/function_types/property_tags.hpp>
|
||
|
|
#include <boost/mpl/vector.hpp>
|
||
|
|
#include <boost/preprocessor/cat.hpp>
|
||
|
|
#include <boost/tti/detail/dfunction.hpp>
|
||
|
|
#include <boost/tti/gen/has_function_gen.hpp>
|
||
|
|
|
||
|
|
/*
|
||
|
|
|
||
|
|
The succeeding comments in this file are in doxygen format.
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
/** \file
|
||
|
|
*/
|
||
|
|
|
||
|
|
/// Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists.
|
||
|
|
/**
|
||
|
|
|
||
|
|
trait = the name of the metafunction within the tti namespace.
|
||
|
|
|
||
|
|
name = the name of the inner member.
|
||
|
|
|
||
|
|
generates a metafunction called "trait" where 'trait' is the macro parameter.
|
||
|
|
|
||
|
|
template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG>
|
||
|
|
struct trait
|
||
|
|
{
|
||
|
|
static const value = unspecified;
|
||
|
|
typedef mpl::bool_<true-or-false> type;
|
||
|
|
};
|
||
|
|
|
||
|
|
The metafunction types and return:
|
||
|
|
|
||
|
|
BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'.
|
||
|
|
|
||
|
|
BOOST_TTI_TP_R = the return type of the function
|
||
|
|
|
||
|
|
BOOST_TTI_TP_FS = (optional) the parameters of the function as a boost::mpl forward sequence
|
||
|
|
if function parameters are not empty.
|
||
|
|
|
||
|
|
BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function
|
||
|
|
if the need for a tag exists.
|
||
|
|
|
||
|
|
returns = 'value' is true if the 'name' exists,
|
||
|
|
with the appropriate static member function type,
|
||
|
|
otherwise 'value' is false.
|
||
|
|
|
||
|
|
*/
|
||
|
|
#define BOOST_TTI_TRAIT_HAS_FUNCTION(trait,name) \
|
||
|
|
BOOST_TTI_DETAIL_TRAIT_HAS_FUNCTION(trait,name) \
|
||
|
|
template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS = boost::mpl::vector<>,class BOOST_TTI_TP_TAG = boost::function_types::null_tag> \
|
||
|
|
struct trait \
|
||
|
|
{ \
|
||
|
|
typedef typename \
|
||
|
|
BOOST_PP_CAT(trait,_detail_hf)<BOOST_TTI_TP_T,BOOST_TTI_TP_R,BOOST_TTI_TP_FS,BOOST_TTI_TP_TAG>::type type; \
|
||
|
|
BOOST_STATIC_CONSTANT(bool,value=type::value); \
|
||
|
|
}; \
|
||
|
|
/**/
|
||
|
|
|
||
|
|
/// Expands to a metafunction which tests whether a member function or a static member function with a particular name and signature exists.
|
||
|
|
/**
|
||
|
|
|
||
|
|
name = the name of the inner member.
|
||
|
|
|
||
|
|
generates a metafunction called "has_function_name" where 'name' is the macro parameter.
|
||
|
|
|
||
|
|
template<class BOOST_TTI_TP_T,class BOOST_TTI_TP_R,class BOOST_TTI_TP_FS,class BOOST_TTI_TP_TAG>
|
||
|
|
struct trait
|
||
|
|
{
|
||
|
|
static const value = unspecified;
|
||
|
|
typedef mpl::bool_<true-or-false> type;
|
||
|
|
};
|
||
|
|
|
||
|
|
The metafunction types and return:
|
||
|
|
|
||
|
|
BOOST_TTI_TP_T = the enclosing type in which to look for our 'name'.
|
||
|
|
|
||
|
|
BOOST_TTI_TP_R = the return type of the function
|
||
|
|
|
||
|
|
BOOST_TTI_TP_FS = (optional) the parameters of the function as a boost::mpl forward sequence
|
||
|
|
if function parameters are not empty.
|
||
|
|
|
||
|
|
BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function
|
||
|
|
if the need for a tag exists.
|
||
|
|
|
||
|
|
returns = 'value' is true if the 'name' exists,
|
||
|
|
with the appropriate function type,
|
||
|
|
otherwise 'value' is false.
|
||
|
|
|
||
|
|
*/
|
||
|
|
#define BOOST_TTI_HAS_FUNCTION(name) \
|
||
|
|
BOOST_TTI_TRAIT_HAS_FUNCTION \
|
||
|
|
( \
|
||
|
|
BOOST_TTI_HAS_FUNCTION_GEN(name), \
|
||
|
|
name \
|
||
|
|
) \
|
||
|
|
/**/
|
||
|
|
|
||
|
|
#endif // BOOST_TTI_HAS_FUNCTION_HPP
|