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Examples of list.remove_if() function | C++ STL



Here, we are implementing program that will demonstrate the example of remove_if() function, which is used to remove a set of elements which satisfy the given test condition.
Submitted by IncludeHelp, on October 31, 2018

Example:

Here, we have a list of the integers and performing remove operations based on following given test conditions:

  1. Remove all negative elements
  2. Remove all elements which are divisible by 11
  3. Remove all elements which are greater than 20

Program:

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

//function to display the list 
void dispList(list<int> L)
{
	//declaring iterator to the list 
	list<int>::iterator l_iter;
	for (l_iter = L.begin(); l_iter != L.end(); l_iter++)
		cout<< *l_iter<< " ";
	cout<<endl;
}

int main()
{
	//declaring a list 
	list<int> iList = {10, 20, 11, 22, 21, -10, -20, 13, 55, 44};
	
	//printing list elements
	cout<<"List elements are"<<endl;
	dispList(iList);

	//remove only negative numbers
	iList.remove_if([](int n) {return (n<0); });
	cout<<"List elements after removing Negative elements"<<endl;
	dispList(iList);

	//remove the elements which are divisible by 11
	iList.remove_if([](int n) {return (n%11==0); });
	cout<<"List elements after removing divisble by 11"<<endl;
	dispList(iList);

	//remove the elements which are greater than 20
	iList.remove_if([](int n) {return (n>20); });
	cout<<"List elements after removing greater than 20"<<endl;
	dispList(iList);

	return 0;
}

Output

List elements are
10 20 11 22 21 -10 -20 13 55 44
List elements after removing Negative elements
10 20 11 22 21 13 55 44
List elements after removing divisble by 11
10 20 21 13
List elements after removing greater than 20
10 20 13





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