Unity Game Optimization - Third Edition

Structs are value types

The struct type is an interesting special case in C#. A struct object can contain private, protected, and public fields; have methods; and be instantiated at runtime, just like a class type. However, there is a fundamental difference between the two: a struct type is a value type, and a class type is a reference type. Consequently, this leads to some important differences between the two, namely, that a struct type cannot support inheritance, their properties cannot be given custom default values (member data always defaults to values such as 0 or null since it is a value type), and their default constructors cannot be overridden. This greatly restricts their usage compared to classes, so simply replacing all classes ...