Can Go's Custom Libraries Force Compile-Time Errors for Insufficient Function Arguments?

Can a Custom Library Trigger a Compile Time Error in Go?

In Go, a function with variadic parameters can accept zero or more arguments. While it's valid to call such a function without providing any arguments, it may not always be desirable.

Consider the example of a min() function that calculates the minimum value from a set of inputs. It's crucial that at least one parameter is provided to this function for it to function correctly.

Customizing Function Signature for Compile-Time Error

Since calling a variadic function with no arguments is allowed by the language specification, it's not possible to trigger a compile time error directly using a variadic function.

However, a workaround is to modify the signature of the function to include both a non-variadic and a variadic parameter. This ensures that the caller must provide at least one argument:

func min(first int, rest ...int) int {
    // Implementation to find the minimum value
}

With this signature, calling the min() function without any arguments results in a compile-time error:

min() // Error: not enough arguments in call to min

Other Options

If modifying the function signature is not feasible, the only alternative is to check for the presence of arguments at runtime. In case of an insufficient number of arguments, you can either panic or exit the application. However, this approach cannot trigger a compile-time error.

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