Question

What types may the STL stack be based on? By default, what type is an STL stack based on?

Short answer

Answer: An STL stack can be based on three main sequential containers: std::vector, std::deque, and std::list. If no container type is specified, the default type used is std::deque.

Step-by-step solution

Introduction to STL Stack

The STL (Standard Template Library) provides a stack container that is a Last In First Out (LIFO) data structure. Stacks hold elements in a sequence, and the main operations it allows are pushing a new element onto the top, popping the top element off, or examining the top element.

Types STL Stack Can Be Based On

The STL stack is a container adapter that uses a container (usually a sequential container) as its underlying data structure. There are three main sequential containers that an STL stack can be based on: 1. std::vector 2. std::deque (default) 3. std::list You can choose the underlying container type while declaring the stack by providing the container type as a template argument.

Default Type of STL Stack

By default, if no container type is specified, an STL stack uses the std::deque (a double-ended queue) as its underlying container. This means that if you declare a stack without specifying a container type, it will be based on std::deque.