mirror of
https://github.com/ceph/ceph-csi.git
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63c4c05b35
updating the kubernetes to 1.31.0 in the api folder. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
74 lines
1.9 KiB
Go
74 lines
1.9 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ptr
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import (
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"fmt"
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"reflect"
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)
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// AllPtrFieldsNil tests whether all pointer fields in a struct are nil. This is useful when,
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// for example, an API struct is handled by plugins which need to distinguish
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// "no plugin accepted this spec" from "this spec is empty".
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//
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// This function is only valid for structs and pointers to structs. Any other
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// type will cause a panic. Passing a typed nil pointer will return true.
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func AllPtrFieldsNil(obj interface{}) bool {
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v := reflect.ValueOf(obj)
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if !v.IsValid() {
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panic(fmt.Sprintf("reflect.ValueOf() produced a non-valid Value for %#v", obj))
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}
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if v.Kind() == reflect.Ptr {
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if v.IsNil() {
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return true
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}
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v = v.Elem()
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}
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for i := 0; i < v.NumField(); i++ {
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if v.Field(i).Kind() == reflect.Ptr && !v.Field(i).IsNil() {
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return false
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}
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}
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return true
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}
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// To returns a pointer to the given value.
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func To[T any](v T) *T {
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return &v
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}
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// Deref dereferences ptr and returns the value it points to if no nil, or else
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// returns def.
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func Deref[T any](ptr *T, def T) T {
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if ptr != nil {
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return *ptr
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}
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return def
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}
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// Equal returns true if both arguments are nil or both arguments
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// dereference to the same value.
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func Equal[T comparable](a, b *T) bool {
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if (a == nil) != (b == nil) {
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return false
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}
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if a == nil {
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return true
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}
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return *a == *b
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}
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