public member function

std::stack::size

<stack>
size_type size ( ) const;
Return size
Returns the number of elements in the stack.

This member function effectively calls the member with the same name in the underlying container object.

Parameters

none

Return Value

The number of elements that conform the stack's container content.

Member type size_type is an unsigned integral type.

Example

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// stack::size
#include <iostream>
#include <stack>
using namespace std;

int main ()
{
  stack<int> myints;
  cout << "0. size: " << (int) myints.size() << endl;

  for (int i=0; i<5; i++) myints.push(i);
  cout << "1. size: " << (int) myints.size() << endl;

  myints.pop();
  cout << "2. size: " << (int) myints.size() << endl;

  return 0;
}


Output:
0. size: 0
1. size: 5
2. size: 4

Complexity

Constant.

See also

stack::empty
Test whether container is empty (public member function)