Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/concepts/req1.C @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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// { dg-do compile } // { dg-options "-std=c++17 -fconcepts" } template<typename T> concept bool Class () { return __is_class(T); } // Allow a requires-expression with no parms. template<typename T> concept bool C = requires { typename T::type; }; void f1(auto a) requires Class<decltype(a)>() { } void f2(auto a) requires requires (decltype(a) x) { -x; } { } struct S { } s; // Allow non-type template parms as constraints. template<bool B> requires B struct S0; // OK template<int N> requires N struct S1 { }; // { dg-error "does not have type" } template<int N> requires N == 0 struct S2 { }; // OK template<typename T, T X> requires X struct S3 { }; // OK S3<int, 0> s3a; // { dg-error "constraint failure|does not have type" } S3<bool, false> s3b; // { dg-error "constraint failure" } int main() { f1(s); f2(0); }