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std::stack<T,Container>::top

From cppreference.com
< cpp‎ | container‎ | stack
 
 
 
 
reference top();
(1)
const_reference top() const;
(2)

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 pop() . Equivalent to: c .back().

[edit] Parameters

(none)

[edit] Return value

Reference to the last element.

[edit] Complexity

Constant.

[edit] Example

Run this code
#include <iostream>
#include <stack>
 
void reportStackSize(const std::stack <int>& s)
{
 std::cout << s.size() << " elements on stack\n";
}
 
void reportStackTop(const std::stack <int>& s)
{
 // Leaves element on stack
 std::cout << "Top element: " << s.top() << '\n';
}
 
int main()
{
 std::stack <int> s;
 s.push(2);
 s.push(6);
 s.push(51);
 
 reportStackSize(s);
 reportStackTop(s);
 
 reportStackSize(s);
 s.pop();
 
 reportStackSize(s);
 reportStackTop(s);
}

Output:

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

[edit] See also

inserts element at the top
(public member function) [edit]
removes the top element
(public member function) [edit]
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