c++
Which statement is most accurate about these two approaches?
#include <functional>
struct IFace {
virtual int call(int) const = 0;
virtual ~IFace() = default;
};
int use_virtual(const IFace& f, int x) {
return f.call(x);
}
int use_function(const std::function<int(int)>& f, int x) {
return f(x);
}