Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/concepts/expression2.C @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
---|---|
date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children | 1830386684a0 |
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// { dg-do compile { target c++17 } } // { dg-options "-fconcepts" } template<typename T> concept bool C1() { return requires (T t) { t.f(); }; } template<typename T> concept bool C2() { return requires { typename T::type; }; } template<typename T> requires C1<T>() void f1(T x) { } template<typename T> requires C2<T>() void f2(T x) { } // Note that these declarations are private and therefore // cannot satisify the constraints. class S { using type = int; void f() { } } s; int main() { f1(s); // { dg-error "cannot call" } f2(s); // { dg-error "" } // When used in non-SFINAE contexts, make sure that we fail // the constraint check before emitting the access check // failures. The context is being presented constistently // in both cases. static_assert(C1<S>(), ""); // { dg-error "failed" } static_assert(C2<S>(), ""); // { dg-error "" } }