ceph/src/boost/libs/callable_traits/test/args_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/args.hpp>
  11 #include "test.hpp"
  12
  13 struct foo;
  14
  15 template<typename T>
  16 struct is_substitution_failure_args {
  17
  18     template<typename>
  19     static auto test(...) -> std::true_type;
  20
  21     template<typename U,
  22         TRAIT(boost::callable_traits::args, U, std::tuple)* = nullptr>
  23     static auto test(int) -> std::false_type;
  24
  25     static constexpr bool value = decltype(test<T>(0))::value;
  26 };
  27
  28 int main() {
  29
  30     CT_ASSERT(is_substitution_failure_args<int>::value);
  31     CT_ASSERT(is_substitution_failure_args<int &>::value);
  32     CT_ASSERT(is_substitution_failure_args<int (** const &)()>::value);
  33     CT_ASSERT(is_substitution_failure_args<int (foo::** &)()>::value);
  34     CT_ASSERT(is_substitution_failure_args<int (foo::** const)()>::value);
  35     CT_ASSERT(is_substitution_failure_args<int (foo::** const &)()>::value);
  36     CT_ASSERT(is_substitution_failure_args<int (foo::** volatile)()>::value);
  37     CT_ASSERT(!is_substitution_failure_args<int (* const &)()>::value);
  38     CT_ASSERT(!is_substitution_failure_args<int (foo::* &)()>::value);
  39     CT_ASSERT(!is_substitution_failure_args<int (foo::* const)()>::value);
  40     CT_ASSERT(!is_substitution_failure_args<int (foo::* const &)()>::value);
  41     CT_ASSERT(!is_substitution_failure_args<int (foo::* volatile)()>::value);
  42     auto lambda = [](){};
  43     CT_ASSERT(!is_substitution_failure_args<decltype(lambda)&>::value);
  44     CT_ASSERT(is_substitution_failure_args<void>::value);
  45 }
  46