1 // { dg-do compile { target c++17_only } }
2 // { dg-options "-fconcepts-ts" }
4 // Performance test... This should be fast.
9 concept bool Destructible() {
10 return std::is_destructible<T>::value;
12 template<typename T, typename... Args>
13 concept bool Constructible() {
14 return Destructible<T>() && std::is_constructible<T, Args...>::value;
17 concept bool Move_constructible() {
18 return Constructible<T, T&&>();
21 concept bool Copy_constructible() {
22 return Move_constructible<T>() && Constructible<T, const T&>();
24 template<typename T, typename U>
25 concept bool Assignable() {
26 return std::is_assignable<T, U>::value;
29 concept bool Move_assignable() {
30 return Assignable<T&, T&&>();
33 concept bool Copy_assignable() {
34 return Move_assignable<T>() && Assignable<T&, const T&>();
37 concept bool Copyable() {
38 return Copy_constructible<T>() && Copy_assignable<T>();
42 concept bool C1() { return Copyable<T>(); }
44 concept bool C2() { return C1<T>(); }
46 concept bool C3() { return C2<T>(); }
48 concept bool C4() { return C3<T>(); }
50 concept bool C5() { return C4<T>(); }
52 concept bool C6() { return C5<T>(); }
54 concept bool C7() { return C6<T>(); }
56 concept bool C8() { return C7<T>(); }
58 concept bool C9() { return C8<T>(); }
60 concept bool C10() { return C9<T>(); }
62 concept bool C11() { return C10<T>(); }
71 static_assert(C11<S1>(), "");
72 static_assert(C11<S2>(), "");
73 static_assert(C11<S3>(), "");
74 static_assert(C11<S4>(), "");
75 static_assert(C11<S5>(), "");
76 static_assert(C11<S6>(), "");