Defining and Utilizing Associated Constants in Rust

Associated constants in Rust provide a way to define constants that are associated with a type rather than a specific instance of that type. This is useful for representing values that are logically related to a type, such as default values, maximum sizes, or other type-specific metadata. This challenge will guide you through defining and using associated constants effectively.

Problem Description

You are tasked with creating a module named Geometry that defines a struct Rectangle with fields width and height, both of type u32. Within the Geometry module, you must define an associated constant named DEFAULT_WIDTH with a value of 10 and an associated constant named MAX_HEIGHT with a value of 50. Finally, create a function create_rectangle within the Geometry module that takes no arguments and returns a Rectangle initialized with DEFAULT_WIDTH for the width and MAX_HEIGHT for the height.

Key Requirements:

• Define the Geometry module.
• Define the Rectangle struct within the Geometry module.
• Define DEFAULT_WIDTH and MAX_HEIGHT as associated constants within the Geometry module.
• Create the create_rectangle function within the Geometry module.
• The create_rectangle function should return a Rectangle instance using the associated constants.

Expected Behavior:

The create_rectangle function should return a Rectangle with width equal to 10 and height equal to 50. The associated constants should be accessible through the Geometry module.

Edge Cases to Consider:

• Ensure the associated constants are correctly scoped within the Geometry module.
• Verify that the create_rectangle function correctly utilizes the associated constants during initialization.
• Consider that associated constants are static and immutable.

Examples

Example 1:

Input: None (function takes no arguments)
Output: Rectangle { width: 10, height: 50 }
Explanation: The `create_rectangle` function uses `Geometry::DEFAULT_WIDTH` and `Geometry::MAX_HEIGHT` to initialize a new `Rectangle` instance.

Constraints

• The width and height fields of the Rectangle struct must be of type u32.
• DEFAULT_WIDTH must be 10.
• MAX_HEIGHT must be 50.
• The solution must be written in Rust.
• The code should be well-formatted and readable.

Notes

• Associated constants are declared using const within a module.
• They are accessible using the module name followed by the constant name (e.g., Geometry::DEFAULT_WIDTH).
• Consider the immutability of associated constants when designing your solution. They cannot be changed after definition.
• Think about how associated constants improve code organization and readability compared to global constants.