mirror of https://github.com/docker/cli.git
35 lines
873 B
Go
35 lines
873 B
Go
// Copyright 2018, The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package value
|
|
|
|
import (
|
|
"reflect"
|
|
"unsafe"
|
|
)
|
|
|
|
// Pointer is an opaque typed pointer and is guaranteed to be comparable.
|
|
type Pointer struct {
|
|
p unsafe.Pointer
|
|
t reflect.Type
|
|
}
|
|
|
|
// PointerOf returns a Pointer from v, which must be a
|
|
// reflect.Ptr, reflect.Slice, or reflect.Map.
|
|
func PointerOf(v reflect.Value) Pointer {
|
|
// The proper representation of a pointer is unsafe.Pointer,
|
|
// which is necessary if the GC ever uses a moving collector.
|
|
return Pointer{unsafe.Pointer(v.Pointer()), v.Type()}
|
|
}
|
|
|
|
// IsNil reports whether the pointer is nil.
|
|
func (p Pointer) IsNil() bool {
|
|
return p.p == nil
|
|
}
|
|
|
|
// Uintptr returns the pointer as a uintptr.
|
|
func (p Pointer) Uintptr() uintptr {
|
|
return uintptr(p.p)
|
|
}
|