std::stack::top
reference top(); | | |
|---|---|---|
const_reference top() const; | | |
返回对堆栈中顶部元素的引用。这是最近推出的元素。调用时将删除此元素。pop().有效地打电话c.back()...
参数
%280%29
返回值
引用最后一个元素。
复杂性
常量。
例
二次
#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;
}二次
产出：
二次
3 elements on stack
Top element: 51
3 elements on stack
2 elements on stack
Top element: 6二次
另见
push | inserts element at the top (public member function) |
|---|---|
pop | removes the top element (public member function) |
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