test/std/utilities/optional/optional.syn/optional_in_place_t.fail.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // UNSUPPORTED: c++98, c++03, c++11, c++14
  11 // <optional>
  12
  13 // A program that necessitates the instantiation of template optional for
  14 // (possibly cv-qualified) in_place_t is ill-formed.
  15
  16 #include <optional>
  17
  18 int main()
  19 {
  20     using std::optional;
  21     using std::in_place_t;
  22     using std::in_place;
  23
  24     optional<in_place_t> opt; // expected-note {{requested here}}
  25     // expected-error@optional:* {{"instantiation of optional with in_place_t is ill-formed"}}
  26 }