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package main import ( "errors" "fmt" "golang.org/x/exp/constraints" ) type Maybe[T any] struct { Value T } type None struct { } func (n None) Unwarp() any { return errors.New("empty") } func (m Maybe[T]) Unwarp() any { return m.Value } type Option interface { Unwarp() any } func division[T constraints.Float](m, n int) Option { if n == 0 { return None{} } result := T(m) / T(n) return Maybe[T]{result} } func main() { divide := division[float64](10, 20) value := divide.Unwarp() switch value.(type) { case error: fmt.Println("Can't divide.") break default: fmt.Println(value) } }
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