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Book Overview & Buying
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Table Of Contents
Design Patterns and Best Practices in Rust
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Throughout our calculator's development, we've built an increasingly complex expression tree system representing mathematical calculations. As the calculator evolved to incorporate different modes and features, we discovered the need to apply various operations to these expression trees, including optimization, validation, transformation, and analysis. But how do we add these operations without continuously modifying our expression structs?
The Visitor pattern provides an elegant solution by separating operations from the object structure they operate on. It allows you to define new operations without changing the implementations of the elements on which they operate, effectively letting you add new behaviors to existing structs without modifying them.
Our calculator's expression tree represents mathematical expressions through a hierarchy of objects. The...