Function SingletonFunctionBinding

common/decls/decls.go:523–539

SingletonFunctionBinding creates a singleton function definition to be used with all function overloads. Note, this approach works well if operand is expected to have a specific trait which it implements, e.g. traits.ContainerType. Otherwise, prefer per-overload function bindings.

(fn functions.FunctionOp, traits ...int)

// Note, this approach works well if operand is expected to have a specific trait which it implements,
// e.g. traits.ContainerType. Otherwise, prefer per-overload function bindings.
func SingletonFunctionBinding(fn functions.FunctionOp, traits ...int) FunctionOpt {
	trait := 0
	for _, t := range traits {
		trait = trait | t
	}
	return func(f *FunctionDecl) (*FunctionDecl, error) {
		if f.singleton != nil {
			return nil, fmt.Errorf("function already has a singleton binding: %s", f.Name())
		}
		f.singleton = &functions.Overload{
			Operator:     f.Name(),
			Function:     fn,
			OperandTrait: trait,
		}
		return f, nil
	}
}

// Overload defines a new global overload with an overload id, argument types, and result type. Through the
// use of OverloadOpt options, the overload may also be configured with a binding, an operand trait, and to