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map::empty() function with Example in C++ STL

C++ STL map::empty() function with example: Here, we are going to learn about the map::empty() function in C++ STL, that is used to check whether a map is empty or not?
Submitted by Vivek Kothari, on December 03, 2018

C++ STL map::empty()

It is built-in function in C++ STL and used to check whether the map container is empty or not i.e whether its size is 0 or not?

Syntax

myMap.empty()

Where, myMap is the object of class map.

Parameter(s)

None - It does not accept any parameters.

Return value

It returns True, if map is empty and returns False, otherwise.

Example

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

int main() {
  // Example of Non Empty map
  map<char, string> myMap;

  myMap['i'] = "include";
  myMap['h'] = "help";

  if (myMap.empty()) {
    cout << "myMap is Empty !!";
  } else {
    cout << "myMap contains elements , Not Empty!!";
  }

  cout << endl << endl;

  // Example of Empty map
  map<char, int> empMap;

  if (empMap.empty()) {
    cout << "empMap is Empty !!";
  } else {
    cout << "empMap contains elements , Not Empty!!";
  }

  return 0;
}

Output

myMap contains elements , Not Empty!!

empMap is Empty !!