Matteo Scandolo | abf872d | 2020-12-14 08:22:06 -1000 | [diff] [blame] | 1 | // Copyright 2018, The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
David K. Bainbridge | 0663189 | 2021-08-19 13:07:00 +0000 | [diff] [blame^] | 3 | // license that can be found in the LICENSE file. |
Matteo Scandolo | abf872d | 2020-12-14 08:22:06 -1000 | [diff] [blame] | 4 | |
| 5 | // +build purego |
| 6 | |
| 7 | package value |
| 8 | |
| 9 | import "reflect" |
| 10 | |
| 11 | // Pointer is an opaque typed pointer and is guaranteed to be comparable. |
| 12 | type Pointer struct { |
| 13 | p uintptr |
| 14 | t reflect.Type |
| 15 | } |
| 16 | |
| 17 | // PointerOf returns a Pointer from v, which must be a |
| 18 | // reflect.Ptr, reflect.Slice, or reflect.Map. |
| 19 | func PointerOf(v reflect.Value) Pointer { |
| 20 | // NOTE: Storing a pointer as an uintptr is technically incorrect as it |
| 21 | // assumes that the GC implementation does not use a moving collector. |
| 22 | return Pointer{v.Pointer(), v.Type()} |
| 23 | } |
David K. Bainbridge | 0663189 | 2021-08-19 13:07:00 +0000 | [diff] [blame^] | 24 | |
| 25 | // IsNil reports whether the pointer is nil. |
| 26 | func (p Pointer) IsNil() bool { |
| 27 | return p.p == 0 |
| 28 | } |
| 29 | |
| 30 | // Uintptr returns the pointer as a uintptr. |
| 31 | func (p Pointer) Uintptr() uintptr { |
| 32 | return p.p |
| 33 | } |