public member function
<stack>

std::stack::empty

bool empty ( ) const;
Test whether container is empty
Returns whether the stack is empty, i.e. whether its size is 0.

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

Parameters

none

Return Value

true if the container size is 0, false otherwise.

Example

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

int main ()
{
  stack<int> mystack;
  int sum (0);

  for (int i=1;i<=10;i++) mystack.push(i);

  while (!mystack.empty())
  {
     sum += mystack.top();
     mystack.pop();
  }

  cout << "total: " << sum << endl;
  
  return 0;
}

The example initializes the content of the stack to a sequence of numbers (form 1 to 10). It then pops the elements one by one until it is empty and calculates their sum.

Output:
total: 55

Complexity

Constant.

See also

stack::size
Return size (public member function)