What are the limitations of generic functions in Golang?

Limitations of Go generic functions: only type parameters are supported, value parameters are not supported. Function recursion is not supported. Type parameters cannot be specified explicitly, they are inferred by the compiler.

Restrictions of generic functions in Go language

Generic functions are a new feature in Go language. Allows us to create functions with type parameters that can be inferred at runtime. This allows us to write more versatile and reusable code.

However, generic functions in Go have some limitations:

• Only type parameters are supported: Generic functions only support type parameters, which means they Unable to accept value argument.
• Recursion is not supported: Generic functions cannot be recursive, which means they cannot call themselves.
• Type parameters cannot be specified explicitly: When calling a generic function, the compiler will automatically infer the type parameters. We cannot specify type parameters explicitly.

Practical case

The following is a practical case using generic functions:

func Swap[T any](a, b *T) {
    tmp := *a
    *a = *b
    *b = tmp
}

func main() {
    a := 10
    b := 20
    Swap(&a, &b)
    fmt.Println(a, b) // 输出：20 10
}

In this example, Swap The function is a generic function that accepts two pointers of type parameters T. This function swaps the order of the two values ​​passed to it. By using generics, we can call the Swap function using different data types such as int and string.

Other limitations

In addition to the limitations listed above, generic functions have the following limitations:

• Built-in types cannot be used (e.g. int and string) as type parameters.
• Generic functions cannot be defined through type aliases or interfaces.
• Cannot overload generic functions.

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