堆栈中的 peek() 和 top() 函数有什么区别？

Question

我正在使用堆栈并使用 peek 和 top 函数，但我无法得到它们之间的任何区别。

Answer 1

The difference between them is that std::stack::top() is in the standard and that std::stack::peek() is not.

Maybe you are using some custom stack type that derives from std::stack somehow that adds peek() as a member function? In that case I would expect both functions to behave exactly the same.

Answer 2

peek() & top() functions are same but peek() is unavailable in std::stack . You can check it here- http://www.cplusplus.com/reference/stack/stack/ . Actually, peek() and top() both take O(1) time without any other queries.