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#include <iostream>
#include <string>
#include <unordered_map>
template <typename Type>
concept Addable =
requires(Type lh, Type rh)
{
lh + rh;
};
template <typename Type>
concept Addable2 =
Addable<Type>
and
requires(Type lh, Type rh)
{
lh += rh;
};
template<Addable Type>
Type add(Type const &x, Type const &y)
{
return x + y;
}
template<typename Type>
Type add2(Type const &x, Type const &y)
{
return x + y;
}
using namespace std;
int main()
{
add("one"s, "two"s);
// add(unordered_map<int, int>{}, unordered_map<int, int>{});
}
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