C++ Vector Library - pop_back() Function

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Description

The C++ function std::vector::pop_back() removes last element from vector and reduces size of vector by one.

Declaration

Following is the declaration for std::vector::pop_back() function form std::vector header.

C++98

void pop_back();

Parameters

None

Return value

None

Exceptions

This member function never throws exception. Calling this function on empty vector causes undefined behavior.

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::vector::pop_back() function.

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
   vector<int> v = {1, 2, 3, 4, 5};

   /* Remove last three elements */
   v.pop_back();
   v.pop_back();
   v.pop_back();

   for (int i = 0; i < v.size(); ++i)
      cout << v[i] << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

1
2