The Spaceship Operator and Expression Rewriting

A guide to simplifying our comparison operators using C++20 features

Ryan McCombe
Updated
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Questions & Answers

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Defining the == Operator
Why do we need to explicitly define the == operator if we already have <=>?
Equality vs. Equivalence
What are the differences between std::strong_ordering::equal and std::strong_ordering::equivalent?
Benefits of the Spaceship Operator
What are the benefits of using the spaceship operator <=> over traditional comparison operators?
Custom Comparison Logic
How can we implement custom comparison logic using the spaceship operator <=>?
Using <=> for Sorting
Can <=> be used for sorting algorithms in C++20?
Niche Cases for Three-Way Comparison
How does the C++20 standard handle types that do not naturally fit into the three-way comparison model?
Real-World Examples of <=>
What are some practical examples of using <=> in real-world applications?