libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset_helper.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 #ifndef TEST_STD_SHARED_PTR_RESET_H
   9 #define TEST_STD_SHARED_PTR_RESET_H
  10
  11 #include <memory>
  12 #include <type_traits>
  13
  14 template <class T, class... Args>
  15 std::false_type test_has_reset(...);
  16
  17 template <class T, class... Args>
  18 typename std::enable_if<std::is_same<decltype(std::declval<T>().reset(std::declval<Args>()...)), void>::value,
  19                         std::true_type>::type
  20 test_has_reset(int);
  21
  22 template <class T, class... Args>
  23 using HasReset = decltype(test_has_reset<T, Args...>(0));
  24
  25 #endif // TEST_STD_SHARED_PTR_RESET_H