Time and Location
Title
Back to Basics: The <=> Spaceship Operator
Abstract
The three-way operator <=>, also commonly referred to as the spaceship operator, was added to the C++ Standard in C++20. Prior to C++ 20, definitions of all six individual comparison operators (==, !=, <, >, <=, >=) were required in a class to cover every contingency. From a logic point of view, if the == operator and the < operator were defined, the remaining remaining operators could be expressed in terms of these two operators, but separate implementations of all were still required. Starting in C++20, this is all streamlined thanks to the spaceship operator.
Coverage in books and other educational resources, however, seems to be limited, with the discussion often confined to default cases without much in the way of thorough coverage. In this talk, we will work our way from the basics through examples of full user-defined implementations of the <=> operator on a class.
Speaker Bio
Daniel Hanson is a former full-time lecturer in the Computational Finance & Risk Management program within the Department of Applied Mathematics at the University of Washington. His appointment followed over 25 years of experience in private sector quantitative development in finance and data science. He currently serves as the Student Program Coordinator for CppCon.
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