mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-20 20:10:22 +00:00
87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
/*
|
|
Copyright 2018 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package pointer
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
)
|
|
|
|
// AllPtrFieldsNil tests whether all pointer fields in a struct are nil. This is useful when,
|
|
// for example, an API struct is handled by plugins which need to distinguish
|
|
// "no plugin accepted this spec" from "this spec is empty".
|
|
//
|
|
// This function is only valid for structs and pointers to structs. Any other
|
|
// type will cause a panic. Passing a typed nil pointer will return true.
|
|
func AllPtrFieldsNil(obj interface{}) bool {
|
|
v := reflect.ValueOf(obj)
|
|
if !v.IsValid() {
|
|
panic(fmt.Sprintf("reflect.ValueOf() produced a non-valid Value for %#v", obj))
|
|
}
|
|
if v.Kind() == reflect.Ptr {
|
|
if v.IsNil() {
|
|
return true
|
|
}
|
|
v = v.Elem()
|
|
}
|
|
for i := 0; i < v.NumField(); i++ {
|
|
if v.Field(i).Kind() == reflect.Ptr && !v.Field(i).IsNil() {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Int32Ptr returns a pointer to an int32
|
|
func Int32Ptr(i int32) *int32 {
|
|
return &i
|
|
}
|
|
|
|
// Int64Ptr returns a pointer to an int64
|
|
func Int64Ptr(i int64) *int64 {
|
|
return &i
|
|
}
|
|
|
|
// Int32PtrDerefOr dereference the int32 ptr and returns it if not nil,
|
|
// else returns def.
|
|
func Int32PtrDerefOr(ptr *int32, def int32) int32 {
|
|
if ptr != nil {
|
|
return *ptr
|
|
}
|
|
return def
|
|
}
|
|
|
|
// BoolPtr returns a pointer to a bool
|
|
func BoolPtr(b bool) *bool {
|
|
return &b
|
|
}
|
|
|
|
// StringPtr returns a pointer to the passed string.
|
|
func StringPtr(s string) *string {
|
|
return &s
|
|
}
|
|
|
|
// Float32Ptr returns a pointer to the passed float32.
|
|
func Float32Ptr(i float32) *float32 {
|
|
return &i
|
|
}
|
|
|
|
// Float64Ptr returns a pointer to the passed float64.
|
|
func Float64Ptr(i float64) *float64 {
|
|
return &i
|
|
}
|