libcxx/test/std/utilities/utility/utility.unreachable/unreachable.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, c++11, c++14, c++17, c++20
  10
  11 // Make sure we can use `std::unreachable()`. We can't actually execute it cause that would be
  12 // UB, but we can make sure that it doesn't cause a linker error or something like that.
  13
  14 #include <cassert>
  15 #include <type_traits>
  16 #include <utility>
  17
  18 int main(int argc, char**) {
  19     assert(argc == 1);
  20     if (argc != 1) {
  21         std::unreachable();
  22     }
  23
  24     static_assert(std::is_same_v<decltype(std::unreachable()), void>);
  25
  26     return 0;
  27 }