关于#c++#的问题：C++中set容器，利用仿函数改变排序规则

Question

C++中set容器，利用仿函数改变排序规则，insert报错

In template: static assertion failed due to requirement 'is_invocable_v<const MyCompare &, const int &, const int &>': comparison object must be invocable as const error occurred here in instantiation of member function 'std::_Rb_tree<int, int, std::_Identity, MyCompare>::_S_key' requested here in instantiation of member function 'std::_Rb_tree<int, int, std::_Identity, MyCompare>::_M_get_insert_unique_pos' requested here in instantiation of function template specialization 'std::_Rb_tree<int, int, std::_Identity, MyCompare>::_M_insert_unique' requested here in instantiation of member function 'std::set<int, MyCompare>::insert' requested here

Answer 1

class MyCompare
{
public:
    bool operator()(const int& v1, const int& v2) const
    {
        return v1 > v2;
    }
};