mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-23 21:35:04 +03:00
101 lines
6.3 KiB
C++
101 lines
6.3 KiB
C++
// Copyright (c) 2009-2016 Vladimir Batov.
|
|
// Use, modification and distribution are subject to the Boost Software License,
|
|
// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
|
|
|
|
#ifndef BOOST_CONVERT_IS_CALLABLE_HPP
|
|
#define BOOST_CONVERT_IS_CALLABLE_HPP
|
|
|
|
#include <boost/convert/detail/has_member.hpp>
|
|
|
|
namespace boost { namespace cnv { namespace detail
|
|
{
|
|
typedef ::boost::type_traits::yes_type yes_type;
|
|
typedef ::boost::type_traits:: no_type no_type;
|
|
|
|
struct not_found {};
|
|
struct void_return_substitute {};
|
|
|
|
// The overloaded comma operator only kicks in for U != void essentially short-circuiting
|
|
// itself ineffective. Otherwise, when U=void, the standard op,() kicks in and returns
|
|
// 'void_return_substitute'.
|
|
template<typename U> U const& operator, (U const&, void_return_substitute);
|
|
template<typename U> U& operator, (U&, void_return_substitute);
|
|
|
|
template <typename src, typename dst> struct match_const { typedef dst type; };
|
|
template <typename src, typename dst> struct match_const<src const, dst> { typedef dst const type; };
|
|
|
|
template<typename T, typename return_type>
|
|
struct redirect
|
|
{
|
|
static no_type test (...);
|
|
static yes_type test (return_type);
|
|
};
|
|
|
|
template<typename T>
|
|
struct redirect<T, void>
|
|
{
|
|
static yes_type test (...);
|
|
static no_type test (not_found);
|
|
};
|
|
}}}
|
|
|
|
// No-args case needs to be implemented differently and has not been implemented yet.
|
|
// template <typename R>
|
|
// struct check<true, R ()>
|
|
|
|
// C1. Need to find some unique/ugly names so that they do not clash if this macro is
|
|
// used inside some other template class;
|
|
// C2. Body of the function is not actually used anywhere.
|
|
// However, Intel C++ compiler treats it as an error. So, we provide the body.
|
|
|
|
#define BOOST_DECLARE_IS_CALLABLE(__trait_name__, __member_name__) \
|
|
\
|
|
template <typename __boost_is_callable_T__, typename __boost_is_callable_signature__> \
|
|
class __trait_name__ \
|
|
{ \
|
|
typedef __boost_is_callable_T__ class_type; /*C1*/ \
|
|
typedef __boost_is_callable_signature__ signature; /*C1*/ \
|
|
typedef boost::cnv::detail::not_found not_found; \
|
|
\
|
|
BOOST_DECLARE_HAS_MEMBER(has_member, __member_name__); \
|
|
\
|
|
struct mixin : public class_type \
|
|
{ \
|
|
using class_type::__member_name__; \
|
|
not_found __member_name__(...) const { return not_found(); /*C2*/} \
|
|
}; \
|
|
\
|
|
typedef typename boost::cnv::detail::match_const<class_type, mixin>::type* mixin_ptr; \
|
|
\
|
|
template <bool has, typename F> struct check { static bool const value = false; }; \
|
|
\
|
|
template <typename Arg1, typename R> \
|
|
struct check<true, R (Arg1)> \
|
|
{ \
|
|
typedef typename boost::decay<Arg1>::type* a1; \
|
|
\
|
|
static bool const value = sizeof(boost::type_traits::yes_type) \
|
|
== sizeof(boost::cnv::detail::redirect<class_type, R>::test( \
|
|
(mixin_ptr(0)->__member_name__(*a1(0)), \
|
|
boost::cnv::detail::void_return_substitute()))); \
|
|
}; \
|
|
template <typename Arg1, typename Arg2, typename R> \
|
|
struct check<true, R (Arg1, Arg2)> \
|
|
{ \
|
|
typedef typename boost::decay<Arg1>::type* a1; \
|
|
typedef typename boost::decay<Arg2>::type* a2; \
|
|
\
|
|
static bool const value = sizeof(boost::type_traits::yes_type) \
|
|
== sizeof(boost::cnv::detail::redirect<class_type, R>::test( \
|
|
(mixin_ptr(0)->__member_name__(*a1(0), *a2(0)), \
|
|
boost::cnv::detail::void_return_substitute()))); \
|
|
}; \
|
|
\
|
|
public: \
|
|
\
|
|
/* Check the existence of __member_name__ first, then the signature. */ \
|
|
static bool const value = check<has_member<class_type>::value, signature>::value; \
|
|
}
|
|
|
|
#endif // BOOST_CONVERT_IS_CALLABLE_HPP
|