libcxx/test/std/utilities/memory/temporary.buffer/overaligned.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 // UNSUPPORTED: c++03
  10
  11 // Aligned allocations are not supported on macOS < 10.13
  12 // Note: use 'unsupported' instead of 'xfail' to ensure
  13 // we won't pass prior to c++17.
  14 // UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12}}
  15
  16 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
  17
  18 // <memory>
  19
  20 // template <class T>
  21 //   pair<T*, ptrdiff_t>
  22 //   get_temporary_buffer(ptrdiff_t n);
  23 //
  24 // template <class T>
  25 //   void
  26 //   return_temporary_buffer(T* p);
  27
  28 #include <cassert>
  29 #include <cstdint>
  30 #include <memory>
  31 #include <utility>
  32
  33 #include "test_macros.h"
  34
  35 struct alignas(32) A {
  36     int field;
  37 };
  38
  39 int main(int, char**)
  40 {
  41     std::pair<A*, std::ptrdiff_t> ip = std::get_temporary_buffer<A>(5);
  42     assert(!(ip.first == nullptr) ^ (ip.second == 0));
  43     assert(reinterpret_cast<std::uintptr_t>(ip.first) % alignof(A) == 0);
  44     std::return_temporary_buffer(ip.first);
  45
  46   return 0;
  47 }