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Fix #10443: SFINAE-friendly result_of::invoke.

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It means previous pull-requests (#24) is still incomplete.
This commit is contained in:
Kohei Takahashi
2015-02-12 21:21:01 +09:00
parent c5c0147d7d
commit bd4b1cdac6
7 changed files with 171 additions and 107 deletions
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54
test/compile_time/sfinae_friendly.hpp Normal file
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/*=============================================================================
Copyright (c) 2015 Kohei Takahashi
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).
==============================================================================*/
#ifndef FUSION_TEST_SFINAE_FRIENDLY_HPP
#define FUSION_TEST_SFINAE_FRIENDLY_HPP
#include <boost/config.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/fusion/support/detail/result_of.hpp>
#if !defined(BOOST_NO_SFINAE) && !defined(BOOST_FUSION_NO_DECLTYPE_BASED_RESULT_OF)
#include <boost/fusion/container/vector.hpp>
namespace sfinae_friendly
{
template <typename, typename T = void> struct void_ { typedef T type; };
template <typename> struct arg_;
template <typename R, typename T> struct arg_<R(T)> { typedef T type; };
template <typename Traits, typename = void>
struct check
: boost::mpl::true_ { };
template <typename Traits>
struct check<Traits, typename void_<typename Traits::type>::type>
: boost::mpl::false_ { };
struct unspecified {};
typedef boost::fusion::vector<> v0;
typedef boost::fusion::vector<unspecified> v1;
typedef boost::fusion::vector<unspecified, unspecified> v2;
typedef boost::fusion::vector<unspecified, unspecified, unspecified> v3;
}
#define SFINAE_FRIENDLY_ASSERT(Traits) \
BOOST_MPL_ASSERT((::sfinae_friendly::check<typename ::sfinae_friendly::arg_<void Traits>::type>))
#else
#define SFINAE_FRIENDLY_ASSERT(Traits) \
BOOST_MPL_ASSERT((boost::mpl::true_))
#endif
#endif // FUSION_TEST_SFINAE_FRIENDLY_HPP