Do generic functions in Golang support all types?

No, generic functions in Go only support user-defined types, pointer types, slice types, mapping types and channel types.

Does generic functions in Golang support all types?

Overview

Generic functions allow us to create functions that work with various types of data. Generics were introduced in Go 1.18, but they don't work with all types.

Restrictions

Generic functions in Go have some restrictions, including:

• Basic types (such as int, float, etc.) cannot be used as a generic type parameter.
• A generic type parameter must have a method set, which means it cannot be used on a structure or interface without methods.
• Generic type parameters cannot have multiple type constraints.

Supported types

Generic functions in Go support the following types:

• User-defined types (structure, Interface, alias)
• Pointer type (add * symbol after the type name)
• Slice type ([] type name)
• Map type (map[type name 1] type Name 2)
• Channel type (chan type name)

Practical case

The following is an example showing how to use generic functions :

func max[T constraints.Ordered](a, b T) T {
    if a > b {
        return a
    }
    return b
}

func main() {
    maxInt := max(5, 10)    // int 类型
    maxFloat := max(3.14, 6.28)  // float64 类型
}

The max function accepts two generic type parameters that implement the constraints.Ordered interface and returns the larger of the two. This interface provides the and <code>> comparison operators.

Conclusion

Generic functions in Go are very useful for creating functions that work on various types of data. However, it has some limitations, such as the inability to use basic types or types without method sets.

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