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Chapter 18: Problem 6

The STL stack is considered a container adapter. What does that mean?

Short Answer

Expert verified
Answer: The STL stack is considered a container adapter because it uses an existing container class as its underlying storage mechanism, and provides a specific set of member functions to access and manipulate its elements in a Last-In-First-Out (LIFO) manner.

Step by step solution

01

Defining a Container Adapter

A container adapter is a class template that uses an existing container class as its underlying storage mechanism, providing a specific set of member functions to access and manipulate its elements in a certain way.
02

Understanding the STL Stack

The STL stack is a container adapter that provides a Last-In-First-Out (LIFO) data structure, which means that the newest elements are on the top and the oldest elements are on the bottom. The basic operations of a stack include push (insert an element at the top), pop (remove the top element), and top (access the top element without removing it).
03

The Underlying Storage Mechanism for STL Stack

The STL stack is implemented as an adapter that uses another container as its underlying storage. By default, it uses the STL deque, but it can also be configured to use other containers, such as the STL vector or list. The container being adapted should support at least the following operations: `back()`, `push_back()`, and `pop_back()`.
04

An Example of STL Stack

Here's an example of how to use the STL stack: ``` #include #include int main() { std::stack my_stack; my_stack.push(10); my_stack.push(20); my_stack.push(30); std::cout << "Top element: " << my_stack.top() << std::endl; // Output: 30 my_stack.pop(); std::cout << "Top element after pop: " << my_stack.top() << std::endl; // Output: 20 return 0; } ```
05

Conclusion

In conclusion, the STL stack is considered a container adapter because it provides a specific set of member functions to access and manipulate its elements in a LIFO manner, using an existing container class as its underlying storage mechanism.

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Most popular questions from this chapter

What does FIFO mean?

The __________ element saved in a queue is the first one retrieved.

Write two different code segments that may be used to wrap an index back around to the beginning of an array when it moves past the end of the array. Use an if/else statement in one segment and modular arithmetic in the other.

When an element is removed from a queue, where is it removed from?

Describe two operations that static stacks must perform.
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