view gcc/testsuite/g++.dg/concepts/fn5.C @ 111:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents
children 84e7813d76e9
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// { dg-options "-std=c++17 -fconcepts" }

// Check shorthand notation.

template<typename T>
  concept bool Type() { return true; }

template<typename T, typename U>
  concept bool Same() { return __is_same_as(T, U); }

template<Same<int> T> struct S1 { };
template<typename T, Same<T> U> struct S2 { };

void f(Same<int> q) { }
void g(Type a, Same<decltype(a)> b) { }

int main() {
  S1<char> s1;      // { dg-error "constraint|invalid" }
  S2<int, char> s2; // { dg-error "constraint|invalid" }

  f('a');    // { dg-error "cannot" }
  g(0, 'a'); // { dg-error "cannot" }
}