libcxx/test/std/utilities/memory/ptr.align/assume_aligned.nodiscard.verify.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, c++11, c++14, c++17
  10
  11 // #include <memory>
  12
  13 // template<size_t N, class T>
  14 // [[nodiscard]] constexpr T* assume_aligned(T* ptr);
  15
  16 #include <memory>
  17
  18 void f() {
  19   int *p = nullptr;
  20   std::assume_aligned<4>(p); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
  21 }