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#include <string>
#include <concepts>
template <typename LHS, typename RHS>
concept CommonWith = std::common_with<LHS, RHS>;
template <typename T1, typename T2>
requires CommonWith<T1, T2>
void fun2(T1 &&t1, T2 &&t2)
{}
template <typename LHS, typename RHS>
concept CommonRef = std::common_reference_with<LHS, RHS>;
template <typename T1, typename T2>
requires CommonRef<T1, T2>
void fun(T1 &&t1, T2 &&t2)
{}
struct B
{};
struct D1: public B
{
};
struct D2: public B
{
};
int main()
{
fun(4, 'a');
fun(4.5, 'a');
D1 d1;
B b;
fun(b, d1); // OK
fun(d1, b); // OK
fun(B{}, d1); // OK
fun(d1, B{}); // OK
fun(b, D1{}); // OK
fun(D1{}, b); // OK
fun(B{}, D1{}); // OK
fun(D1{}, B{}); // OK
fun2(B{}, D2{}); // OK
}
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