Type sets in generics

Type sets in Go generics define the collection of types a type parameter can represent, determined by the constraints you specify. You define a type set using an interface constraint, where the set includes all types that satisfy that interface.

type MyConstraint interface {
    ~int | ~string // Type set: int, string, and their aliases
}

func Process[T MyConstraint](x T) {
    // T can be int, string, or any type aliasing them
}

In this example, the type set for MyConstraint includes int, string, and any type defined as type MyInt int or type MyString string.

A type set is the list of all specific types that fit a generic rule you create. Think of it like a club membership list: if you define the rule as 'must be an integer or a string,' the type set is every single integer and string type in your program. You use this to tell the compiler exactly which data types your generic function is allowed to handle.