Cannot understand how function is passing as a parameter

#1

#include
using namespace std;[quote=“khushmanglani31217_7de9bf16f9c8f286, post:1, topic:167789, full:true”]

#include <iostream>
using namespace std;

bool compare(int a,int b){
     cout<<"Comparing "<<a<<" and "<<b<<endl;
     return a < b;
}

//We will implement our own sort method
void bubble_sort(int arr[],int n, bool (&cmp)(int a,int b)){
     //N-1 iteration to move N-1 large element to the end
     for(int i=0 ; i < n - 1 ; ++i){
          //pairwise swapping in unsorted part
         for(int j=0 ; j < n - i - 1; ++j){
             if(cmp(arr[j+1],arr[j]))
                  swap(arr[j+1],arr[j]);
         }
     }
}

int main(){
    int n;
    cin>>n;

    int a[1000];

    //Taking input from the user
    for(int i=0 ; i < n ; ++i){
         cin>>a[i];
    }

    bubble_sort(a,n,compare);

    for(int i=0 ; i < n ; ++i){
        cout<<a[i]<<",";
    }
   cout<<endl;
   return 0;
}

I am not able to understand how we pass function as parameter void bubble_sort(int arr[],int n, bool (&cmp)(int a,int b)) and how we pass this bool (&cmp)(int a,int b) name to compare function.

#2

hi @khushmanglani31217_7de9bf16f9c8f286 from main function u are passing the name of the function and in the parameters u have to receive the function so for that u need to first write the return type then function name with parameters as done here

#3

Thank you so much for you help

#4

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