Thread: Is this claim correct: "Anywhere you pass in a function, you can pass in a functor"?

Is this claim correct: "Anywhere you pass in a function, you can pass in a functor"?

for example:

Code:

bool cmp_function(int a, int b){
return a<b;
}

struct cmp_functor{
bool operator()(int a, int b){
return a<b;
}
};

std::sort(vec.begin(), vec.end(), cmp_function);
std::sort(vec.begin(), vec.end(), cmp_functor);