Behavioral Design Patterns in C++ - Boolean Interpreter - I

The video tutorial explains the implementation of the interpreter design pattern. It covers the creation of terminal and non-terminal expression classes, which inherit from a common base class. The tutorial also discusses the need for a lexer and parser, and how to implement them. The parser class is modified to use expression pointers, and the parse function is adjusted to accept expressions directly. The video concludes with a brief overview of the changes made to the parser class and function.

What is the primary role of the terminal expression in the interpreter design pattern?

• To parse tokens

• To represent literal symbols

• To store context data

• To define grammar rules

Which method must be implemented in the expression base class?

• execute

• interpret

• parse

• evaluate

In the context of the interpreter pattern, what does the 'and' expression class represent?

• A non-terminal expression

• A terminal expression

• A lexer function

• A parser function

How many operands does the 'and' expression class handle in this example?

• One

• Two

• Three

• Four

What is the purpose of the lexer in the interpreter design pattern?

• To parse expressions

• To store context data

• To execute expressions

• To tokenize input

What change is made to the parse function's return type?

• It returns a string

• It returns an expression pointer

• It returns an integer

• It returns a boolean

Why are the lexer and parser kept separate in this implementation?

• To simplify the code

• To enhance performance

• To reduce memory usage

• To better understand the steps