boost/tti/has_function_template.hpp
// (C) Copyright Edward Diener 2019
// 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_FUNCTION_TEMPLATE_HPP)
#define BOOST_TTI_FUNCTION_TEMPLATE_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/gen/namespace_gen.hpp>
#include <boost/tti/gen/has_function_template_gen.hpp>
#include <boost/tti/detail/dfunction_template.hpp>
#if BOOST_PP_VARIADICS
#include <boost/tti/detail/dmacro_fun_template.hpp>
/*
The succeeding comments in this file are in doxygen format.
*/
/** \file
*/
/// A macro which expands to a metafunction which tests whether an inner member function template or static member function template with a particular name exists.
/**
BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE is a macro which expands to a metafunction.
The metafunction tests whether an inner member function template or static member function template with a particular name exists.
The macro takes the form of BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE(trait,name,...) where
trait = the name of the metafunction <br/>
name = inner member function template or static member function template name <br/>
... = variadic parameters.
The variadic parameter(s) are either:
A sequence of valid instantiations for the static member function template parameters
ie. 'int,long,double' etc.
or
A single variadic parameter which is a Boost PP array whose elements are
a sequence of valid instantiations for the static member function template parameters
ie. '(3,(int,long,double))' etc. This form is allowed in order to be compatible
with using the non-variadic form of this macro.
BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE generates a metafunction called "trait" where 'trait' is the first macro parameter.
@code
template<class BOOST_TTI_TP_T,class BOOST_TTI_R,class BOOST_TTI_FS,class BOOST_TTI_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'.
The enclosing type can be a class, struct, or union.
BOOST_TTI_TP_R = the return type of the function template
in a single instantiation of the function template
BOOST_TTI_TP_FS = (optional) the parameters of the function template as a boost::mpl forward sequence
if the function template parameters are not empty. These parameters are a single
instantiation of the function template.
BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function template
if a tag is needed.
returns = 'value' is true if the 'name' exists,
with the appropriate member function template or static member function template type,
otherwise 'value' is false.
@endcode
*/
#define BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE(trait,name,...) \
BOOST_TTI_DETAIL_TRAIT_HAS_FUNCTION_TEMPLATE \
( \
trait, \
name, \
BOOST_TTI_DETAIL_FUN_TEMPLATE_VARIADIC_TO_ARRAY(__VA_ARGS__) \
) \
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_hft)<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); \
}; \
/**/
/// A macro which expands to a metafunction which tests whether an inner member function template or static member function template with a particular name exists.
/**
BOOST_TTI__HAS_FUNCTION_TEMPLATE is a macro which expands to a metafunction.
The metafunction tests whether an inner member function template or static member function template with a particular name exists.
The macro takes the form of BOOST_TTI_HAS_FUNCTION_TEMPLATE(name,...) where
name = inner member function template or static member function template name <br/>
... = variadic parameters.
The variadic parameter(s) are either:
A sequence of valid instantiations for the static member function template parameters
ie. 'int,long,double' etc.
or
A single variadic parameter which is a Boost PP array whose elements are
a sequence of valid instantiations for the static member function template parameters
ie. '(3,(int,long,double))' etc. This form is allowed in order to be compatible
with using the non-variadic form of this macro.
BOOST_TTI_HAS_FUNCTION_TEMPLATE generates a metafunction called "has_function_template_'name'" where 'name' is the first macro parameter.
@code
template<class BOOST_TTI_TP_T,class BOOST_TTI_R,class BOOST_TTI_FS,class BOOST_TTI_TAG>
struct has_function_template_'name'
{
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'.
The enclosing type can be a class, struct, or union.
BOOST_TTI_TP_R = the return type of the function template
in a single instantiation of the function template
BOOST_TTI_TP_FS = (optional) the parameters of the function template as a boost::mpl forward sequence
if the function template parameters are not empty. These parameters are a single
instantiation of the function template.
BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function template
if a tag is needed.
returns = 'value' is true if the 'name' exists,
with the appropriate member function template or static member function template type,
otherwise 'value' is false.
@endcode
*/
#define BOOST_TTI_HAS_FUNCTION_TEMPLATE(name,...) \
BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE \
( \
BOOST_TTI_HAS_FUNCTION_TEMPLATE_GEN(name), \
name, \
__VA_ARGS__ \
) \
/**/
#else // !BOOST_PP_VARIADICS
/*
The succeeding comments in this file are in doxygen format.
*/
/** \file
*/
/// A macro which expands to a metafunction which tests whether an inner member function template or static member function template with a particular name exists.
/**
BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE is a macro which expands to a metafunction.
The metafunction tests whether an inner member function template or static member function template with a particular name exists.
The macro takes the form of BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE(trait,name,pparray) where
trait = the name of the metafunction <br/>
name = inner member function template or static member function template name <br/>
pparray = a Boost PP array whose elements are a sequence of valid instantiations for
the static member function template parameters ie. '(3,(int,long,double))' etc.
BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE generates a metafunction called "trait" where 'trait' is the first macro parameter.
@code
template<class BOOST_TTI_TP_T,class BOOST_TTI_R,class BOOST_TTI_FS,class BOOST_TTI_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'.
The enclosing type can be a class, struct, or union.
BOOST_TTI_TP_R = the return type of the function template
in a single instantiation of the function template
BOOST_TTI_TP_FS = (optional) the parameters of the function template as a boost::mpl forward sequence
if the function template parameters are not empty. These parameters are a single
instantiation of the function template.
BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function template
if a tag is needed.
returns = 'value' is true if the 'name' exists,
with the appropriate member function template or static member function template type,
otherwise 'value' is false.
@endcode
*/
#define BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE(trait,name,pparray) \
BOOST_TTI_DETAIL_TRAIT_HAS_FUNCTION_TEMPLATE(trait,name,pparray) \
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_hft)<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); \
}; \
/**/
/// A macro which expands to a metafunction which tests whether an inner member function template or static member function template with a particular name exists.
/**
BOOST_TTI_HAS_FUNCTION_TEMPLATE is a macro which expands to a metafunction.
The metafunction tests whether an inner member function template or static member function template with a particular name exists.
The macro takes the form of BOOST_TTI_HAS_FUNCTION_TEMPLATE(name,pparray) where
name = inner member function template or static member function template name <br/>
pparray = a Boost PP array whose elements are a sequence of valid instantiations for
the static member function template parameters ie. '(3,(int,long,double))' etc.
BOOST_TTI_HAS_FUNCTION_TEMPLATE generates a metafunction called "has_function_template_'name'" where 'name' is the first macro parameter.
@code
template<class BOOST_TTI_TP_T,class BOOST_TTI_R,class BOOST_TTI_FS,class BOOST_TTI_TAG>
struct has_function_template_'name'
{
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'.
The enclosing type can be a class, struct, or union.
BOOST_TTI_TP_R = the return type of the function template
in a single instantiation of the function template
BOOST_TTI_TP_FS = (optional) the parameters of the function template as a boost::mpl forward sequence
if the function template parameters are not empty. These parameters are a single
instantiation of the function template.
BOOST_TTI_TP_TAG = (optional) a boost::function_types tag to apply to the function template
if a tag is needed.
returns = 'value' is true if the 'name' exists,
with the appropriate member function template or static member function template type,
otherwise 'value' is false.
@endcode
*/
#define BOOST_TTI_HAS_FUNCTION_TEMPLATE(name,pparray) \
BOOST_TTI_TRAIT_HAS_FUNCTION_TEMPLATE \
( \
BOOST_TTI_HAS_FUNCTION_TEMPLATE_GEN(name), \
name, \
pparray \
) \
/**/
#endif // BOOST_PP_VARIADICS
#endif // BOOST_TTI_FUNCTION_TEMPLATE_HPP