CODEWITHSUNDEEP
c++stl
SJinxin
SJinxin

Reputation: 85

Passing function by reference or by value?

#include <iostream>
#include <algorithm>
using namespace std;

bool myfn(int i, int j) { return i<j; }



int main () {
int myints[] = {3,7,2,5,6,4,9};

 // using function myfn as comp:
cout << "The smallest element is " << *min_element(myints,myints+7,myfn) << endl;
cout << "The largest element is " << *max_element(myints,myints+7,myfn) << endl;

return 0;
}

considering the above code , is there any difference if we passmyfn or &myfn to min_element? when we tried to pass a functor which one would be a more standard way?

Upvotes: 3

Views: 313

Answers (2)

Code-Apprentice
Code-Apprentice

Reputation: 83537

Typically, pass-by-reference and pass-by-value only refer to passing variables, not functions. (Template functions introduce some complications, but that is for another discussion.) Here you are passing myfn as a pointer to a function. There is no difference if you use &myfn instead. The compiler will implicitly convert myfn to a pointer to the function with that name.

Upvotes: 10

Sarfaraz Nawaz
Sarfaraz Nawaz

Reputation: 361522

is there any difference if we pass myfn or &myfn to min_element?

No. myfn gets implicitly converted into pointer-to-function, anyway. So there is no difference at all.

Upvotes: 6

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