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std::stack::top

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< cpp‎ | container‎ | stack
Revision as of 10:11, 2 November 2012 by P12bot (Talk | contribs)

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reference top();
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const_reference top() const;
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Returns reference to the top element in the stack. This is the most recently pushed element. This element will be removed on a call to Template:rlpf. Effectively calls c.back().

Contents

Parameters

(none)

Return value

reference to the last element

Complexity

Constant

See also

Template:cpp/container/dcl list pushTemplate:cpp/container/dcl list pop

Example

#include <stack>
#include <iostream>
 
int main()
{
    std::stack<int>   s;
 
    s.push( 2 );
    s.push( 6 );
    s.push( 51 );
 
    std::cout << s.size() << " elements on stack\n";
    std::cout << "Top element: "
	      << s.top()         // Leaves element on stack
	      << "\n";
    std::cout << s.size() << " elements on stack\n";
    s.pop();
    std::cout << s.size() << " elements on stack\n";
    std::cout << "Top element: " << s.top() << "\n";
 
    return 0;
}

Output:

3 elements on stack
Top element: 51
3 elements on stack
2 elements on stack
Top element: 6