How Can I Ensure Interface Implementation in Go at Compile Time?

Ensuring Interface Implementation at Compile Time in Go

When converting types dynamically, it can be challenging to ensure that they implement specific interfaces. Assigning to support interfaces from an unsupported type typically results in failure, but this approach may not be suitable for types converted at runtime. To avoid confusing error messages and inconvenient run-time discoveries, a compile-time verification mechanism is desirable.

In Go, this verification can be achieved using a type-like declaration (TLD). By assigning a type to an interface variable, you can force the compiler to check whether the type implements the interface. For example:

var _ foo.RequiredInterface = myType{} // or &myType{} or [&]myType if scalar

This declaration asserts that myType must implement the RequiredInterface interface. If it doesn't, a compile-time error will be generated, providing a clear indication of the issue.

By using this approach, you can enforce interface compliance for types converted dynamically, ensuring that they meet your expectations and reducing potential run-time complications.

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