nil.go

// Copyright (c) 2016-2024 by Richard A. Wilkes. All rights reserved.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, version 2.0. If a copy of the MPL was not distributed with
// this file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
// This Source Code Form is "Incompatible With Secondary Licenses", as
// defined by the Mozilla Public License, version 2.0.

package toolbox

import "reflect"

// IsNil returns true if the interface is nil or if the value it points to is nil.
func IsNil(i any) bool {
	if i == nil {
		return true
	}
	switch reflect.TypeOf(i).Kind() {
	case reflect.Chan,
		reflect.Func,
		reflect.Interface,
		reflect.Map,
		reflect.Pointer,
		reflect.Slice,
		reflect.UnsafePointer:
		return reflect.ValueOf(i).IsNil()
	default:
		return false
	}
}