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

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.

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).

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()`.

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; } ```

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

Short Answer

Step by step solution

Defining a Container Adapter

Understanding the STL Stack

The Underlying Storage Mechanism for STL Stack

An Example of STL Stack

Conclusion

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