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// { dg-do compile { target c++20 } }
// { dg-additional-options "-fconcepts" }
template<class T>
class A {
public:
template<int I, class S>
requires (I > 0)
friend int f1(const A<S>&);
template<int I, class S>
friend int f2(const A<S>&) requires (I > 0);
private:
int x = 2;
};
template<int I, class S>
requires (I > 0)
int f1(const A<S>& a) {
return a.x;
}
template<int I, class S>
int f2(const A<S>& a) requires (I > 0) {
return a.x;
}
class B {
public:
template<int I>
requires (I > 0)
friend int f3(const B&);
template<int I>
friend int f4(const B&) requires (I > 0);
private:
int x = 2;
};
template<int I>
requires (I > 0)
int f3(const B& a) {
return a.x;
}
template<int I>
int f4(const B& a) requires (I > 0) {
return a.x;
}
int main() {
A<double> a;
f1<2>(a);
f2<2>(a);
B b;
f3<2>(b);
f4<2>(b);
return 0;
}
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