libcxx/test/support/test.support/test_poisoned_hash_helper.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++98, c++03

// Test that the header `poisoned_hash_helper.hpp` doesn't include any
// headers that provide hash<T> specializations. This is required so that the
// 'test_library_hash_specializations_available()' function returns false
// by default, unless a STL header providing hash has already been included.

#include "poisoned_hash_helper.hpp"

#include "test_macros.h"

template <class T, size_t = sizeof(T)>
constexpr bool is_complete_imp(int) { return true; }
template <class> constexpr bool is_complete_imp(long) { return false; }
template <class T> constexpr bool is_complete() { return is_complete_imp<T>(0); }

template <class T> struct has_complete_hash {
  enum { value = is_complete<std::hash<T> >() };
};

int main(int, char**) {
  static_assert(LibraryHashTypes::assertTrait<has_complete_hash, false>(), "");

  return 0;
}