libcxx/test/std/language.support/support.dynamic/ptr.launder/launder.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 // <new>
  10
  11 // template <class T> constexpr T* launder(T* p) noexcept;
  12
  13 // UNSUPPORTED: c++03, c++11, c++14
  14
  15 #include <cassert>
  16 #include <new>
  17 #include <type_traits>
  18
  19 constexpr int gi = 5;
  20 constexpr float gf = 8.f;
  21
  22 int main(int, char**) {
  23     static_assert(std::launder(&gi) == &gi, "" );
  24     static_assert(std::launder(&gf) == &gf, "" );
  25
  26     const int *i = &gi;
  27     const float *f = &gf;
  28     static_assert(std::is_same<decltype(i), decltype(std::launder(i))>::value, "");
  29     static_assert(std::is_same<decltype(f), decltype(std::launder(f))>::value, "");
  30
  31     assert(std::launder(i) == i);
  32     assert(std::launder(f) == f);
  33
  34   return 0;
  35 }