ceph/src/boost/libs/callable_traits/test/qualified_class_of_constraints.cpp

   1
   2 /*
   3 Copyright Barrett Adair 2016-2017
   4
   5 Distributed under the Boost Software License, Version 1.0.
   6 (See accompanying file LICENSE.md or copy at http ://boost.org/LICENSE_1_0.txt)
   7
   8 */
   9
  10 #include <boost/callable_traits/qualified_class_of.hpp>
  11 #include "test.hpp"
  12
  13 template<typename T>
  14 struct is_substitution_failure_qualified_class_of {
  15
  16     template<typename>
  17     static auto test(...) -> std::true_type;
  18
  19     template<typename A,
  20         typename std::remove_reference<
  21             TRAIT(qualified_class_of, A)>::type* = nullptr>
  22     static auto test(int) -> std::false_type;
  23
  24     static constexpr bool value = decltype(test<T>(0))::value;
  25 };
  26
  27 struct foo;
  28
  29 int main() {
  30
  31     auto lambda = [](){};
  32
  33     CT_ASSERT(is_substitution_failure_qualified_class_of<decltype(lambda)>::value);
  34     CT_ASSERT(is_substitution_failure_qualified_class_of<decltype(lambda)&>::value);
  35     CT_ASSERT(is_substitution_failure_qualified_class_of<void>::value);
  36     CT_ASSERT(is_substitution_failure_qualified_class_of<void*>::value);
  37     CT_ASSERT(is_substitution_failure_qualified_class_of<int>::value);
  38     CT_ASSERT(is_substitution_failure_qualified_class_of<int &>::value);
  39     CT_ASSERT(is_substitution_failure_qualified_class_of<int()>::value);
  40     CT_ASSERT(is_substitution_failure_qualified_class_of<int(*)()>::value);
  41     CT_ASSERT(is_substitution_failure_qualified_class_of<int(**)()>::value);
  42     CT_ASSERT(is_substitution_failure_qualified_class_of<int(&)()>::value);
  43     CT_ASSERT(is_substitution_failure_qualified_class_of<int (* const &)()>::value);
  44     CT_ASSERT(!is_substitution_failure_qualified_class_of<int (foo::* &)()>::value);
  45     CT_ASSERT(!is_substitution_failure_qualified_class_of<int (foo::* const)()>::value);
  46     CT_ASSERT(!is_substitution_failure_qualified_class_of<int (foo::* const &)()>::value);
  47     CT_ASSERT(!is_substitution_failure_qualified_class_of<int (foo::* volatile)()>::value);
  48     CT_ASSERT(is_substitution_failure_qualified_class_of<int (foo::**)()>::value);
  49     CT_ASSERT(is_substitution_failure_qualified_class_of<int (foo::* const *)()>::value);
  50     CT_ASSERT(is_substitution_failure_qualified_class_of<int (foo::* volatile *)()>::value);
  51 }
  52