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- /*
- Copyright 2017 Glen Joseph Fernandes
- (glenjofe@gmail.com)
- Distributed under Boost Software License, Version 1.0.
- (See accompanying file LICENSE_1_0.txt or copy at
- http://www.boost.org/LICENSE_1_0.txt)
- */
- // MACRO: BOOST_NO_CXX11_SFINAE_EXPR
- // TITLE: C++11 SFINAE for expressions
- // DESCRIPTION: C++11 SFINAE for expressions not supported.
- namespace boost_no_cxx11_sfinae_expr {
- template<class>
- struct ignore {
- typedef void type;
- };
- template<class T>
- T& object();
- template<class T, class E = void>
- struct trait {
- static const int value = 0;
- };
- template<class T>
- struct trait<T, typename ignore<decltype(&object<T>())>::type> { };
- template<class T>
- struct result {
- static const int value = T::value;
- };
- class type {
- void operator&() const { }
- };
- int test()
- {
- return result<trait<type> >::value;
- }
- } /* boost_no_cxx11_sfinae_expr */
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