std::stack top() method
- od C++98
// Non const version
reference top();
// Const version
const_reference top() const;
Returns a reference
to the top element in the stack.This element will be the first element to be removed on a call to
pop()
.
zanotuj
Effectively calls c.back()
.
Parameters
(none)
Return value
Reference to the last element.
Exceptions
(none)
Complexity
Constant - (1).
Example
Main.cpp
#include <stack>
#include <iostream>
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