Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/concepts/placeholder2.C @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
---|---|
date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children | 1830386684a0 |
line wrap: on
line source
// { dg-do compile { target c++17 } } // { dg-options "-fconcepts" } // Check argument deduction constraints. // TODO: We shoul have more of these... template<typename T> concept bool C1 = sizeof(T) == 0; template<typename T, typename U> concept bool C2 = __is_same_as(T, U); template<typename T> concept bool D1() { return requires (T t) { { t } -> C1; }; } template<typename T> concept bool D2() { return requires (T t) { { t } -> C2<void>; }; } void f1(D1) { } void f2(D2) { } int main() { f1(0); // { dg-error "cannot call" } f2(0); // { dg-error "cannot call" } }