How Can I Cast a Struct Pointer to an Interface{} and Back in Go?

Casting a Struct Pointer to an Interface

Given that the struct foo and the function bar have inflexible definitions, this question seeks a solution to convert a pointer to foo into an interface{} for use as a parameter in bar. Additionally, the conversion back to a foo struct pointer within bar is necessary.

Conversion to Interface{}

To convert &foo{} into an interface{}, the process is straightforward:

f := &foo{}
bar(f) // Every type implements interface{}.

Conversion Back to *foo

To retrieve the original *foo from the interface{}, two methods are available:

Type Assertion

func bar(baz interface{}) {
    f, ok := baz.(*foo)
    if !ok {
        // baz was not of type *foo. The assertion failed.
    }

    // f is of type *foo
}

Type Switch

func bar(baz interface{}) {
    switch f := baz.(type) {
    case *foo: // f is of type *foo
    default: // f is some other type
    }
}

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