Can Custom Go Libraries Generate Compile-Time Errors for Missing Variadic Function Arguments?

Can Custom Libraries Trigger Compile Time Errors in Golang?

In Golang, it's not possible to trigger a compile-time error when calling a function with variadic parameters with no arguments. The function call min() is considered valid by the language specification.

However, a workaround exists to enforce the passing of at least one argument. By modifying the function signature to include a non-variadic and a variadic parameter, a compile-time error can be generated.

Modified Function Signature:

func min(first int, rest ...int) int {
    // ... Same logic as before
}

This signature requires at least one argument (first) and allows for multiple additional arguments (rest).

Usage:

// This is now a compile-time error
min()

// Valid calls
min(1)
min(1, 2)
min(1, 2, -3)

Note:

The above modification improves efficiency if only one argument is passed as no slice is created. However, slices can still be passed using a technique like:

s := []int{1, 2, -3}
min(s[0], s[1:]...) // Pass first element and sliced slice as variadic parameter

If modifying the function signature is not feasible, runtime panic or app exit is the only option to handle missing arguments.

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