Which fields in Golang function documentation are used to describe the generic restrictions of a function?

Generic restriction field type parameters: List the type parameters of the function and its type restrictions. Constraints: Describe the type restrictions of function parameters and return values, and further restrict type parameters.

Fields describing generic restrictions in Go function documentation

Go 1.18 introduced generics, allowing you to create types that are generic code. In the function documentation, there are several fields used to describe generic restrictions.

Type Parameters

This field lists the type parameters of the function. Each type parameter is represented by an uppercase letter, followed by a colon and a type restriction. For example:

type SomeFunc[T comparable] func(x T)

T is the type parameter of the function, and comparable is its type restriction. This means that x must be of a mutually comparable type, such as int or string.

Constraints

This field lists the type restrictions of the function’s parameters and return value. These restrictions describe type parameters in more detail. For example:

type SomeFunc[T comparable] func(x T) (T, error)

This function has a type parameter T, which must be a comparable type. It returns a value of the same type as x (T) and an error.

Practical case

Consider the following function, which returns the larger of two numbers:

func Max[T int | float64](x, y T) T {
  // ...
}

FunctionMax Yes A type parameter T, which must be of type int or float64. This means that x and y must be integers or floats, and the function will return the largest value of the same type as x and y.

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