clang/test/Parser/cxx20-coroutines.cpp

   1 // RUN: %clang_cc1 -std=c++20 %s -verify
   2
   3 template<typename T, typename U>
   4 U f(T t) {
   5   co_await t;
   6   co_yield t;
   7
   8   1 + co_await t;
   9   1 + co_yield t; // expected-error {{expected expression}}
  10
  11   auto x = co_await t;
  12   auto y = co_yield t;
  13
  14   for co_await (int x : t) {} // expected-warning {{'for co_await' belongs to CoroutineTS instead of C++20, which is deprecated}}
  15   for co_await (int x = 0; x != 10; ++x) {} // expected-error {{'co_await' modifier can only be applied to range-based for loop}}
  16
  17   if (t)
  18     co_return t;
  19   else
  20     co_return {t};
  21 }
  22
  23 struct Y {};
  24 struct X { Y operator co_await(); };
  25 struct Z {};
  26 Y operator co_await(Z);
  27
  28 void f(X x, Z z) {
  29   x.operator co_await();
  30   operator co_await(z);
  31 }
  32
  33 void operator co_await(); // expected-error {{must have at least one parameter}}
  34 void operator co_await(X, Y, Z); // expected-error {{must be a unary operator}}
  35 void operator co_await(int); // expected-error {{parameter of class or enumeration type}}