libcxx/test/std/utilities/memory/default.allocator/allocator.ctor.pass.cpp

   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
   9 // <memory>
  10 //
  11 // template <class T>
  12 // class allocator
  13 // {
  14 // public: // All of these are constexpr after C++17
  15 //  allocator() noexcept;
  16 //  allocator(const allocator&) noexcept;
  17 //  template<class U> allocator(const allocator<U>&) noexcept;
  18 // ...
  19 // };
  20
  21 #include <memory>
  22 #include <cstddef>
  23
  24 #include "test_macros.h"
  25
  26 template<class T>
  27 TEST_CONSTEXPR_CXX20 bool test() {
  28   typedef std::allocator<T> A1;
  29   typedef std::allocator<long> A2;
  30
  31   A1 a1;
  32   A1 a1_copy = a1; (void)a1_copy;
  33   A2 a2 = a1; (void)a2;
  34
  35   return true;
  36 }
  37
  38 int main(int, char**) {
  39   test<char>();
  40   test<int>();
  41   test<void>();
  42
  43 #if TEST_STD_VER > 17
  44   static_assert(test<char>());
  45   static_assert(test<int>());
  46   static_assert(test<void>());
  47 #endif
  48   return 0;
  49 }