How can you determine that a certain structure implements a given interface?

In Go, interface implementation is checked implicitly: if a type contains all the methods declared in the interface, it automatically implements that interface.

To determine if a struct implements a given interface, you can:

1. Attempt to assign an instance of the struct to a variable of the interface type — if compilation succeeds, the struct implements the interface.
2. Use a static check with _var _:

var _ MyInterface = (*MyStruct)(nil)

If this code compiles without errors, it means MyStruct implements the MyInterface interface.

Example:

type MyInterface interface {
    DoSomething()
}

type MyStruct struct {}

func (m *MyStruct) DoSomething() {
    // implementation
}

// Check interface implementation
var _ MyInterface = (*MyStruct)(nil)

Thus, in Go, there is no need to explicitly specify interface implementation — just implement all its methods.