Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/concepts/intro4.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
---|---|
date | Thu, 13 Feb 2020 11:34:05 +0900 |
parents | 84e7813d76e9 |
children |
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// { dg-do compile { target c++17_only } } // { dg-options "-fconcepts" } template<typename ... T> concept bool C1 = true; template<int ... N> concept bool C2 = true; template<typename T> concept bool C3 = __is_class(T); template<typename ... T> concept bool C4() { return true; } template<int N> concept bool C4() { return true; } template<typename T, typename U = int> concept bool C5() { return __is_class(U); } C1{...A, B} void f1() {}; // { dg-error "cannot deduce template parameters" } C1{A} void f2() {} C2{A, B} void f3() {}; C3{...A} void f4() {}; // { dg-error "cannot be introduced" } C4{A} void f5() {}; // { dg-error "cannot deduce template parameters" } C5{A, B} void f6() {}; int main() { // Defaults should not transfer f6<int>(); // { dg-error "no matching" } return 0; }