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reflect: document ptrdata field of rtype

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This CL adds a simple explanation about what means the ptrdata field of
the reflect.rtype type.
Also document that rtype needs to be kept in sync with the runtime._type
type that rtype mirrors.

Change-Id: Icd9663a2e4bb94d922a2417cfe4537861d2ccc97
Reviewed-on: https://go-review.googlesource.com/40917
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Sebastien Binet 2017-04-18 10:48:16 +02:00 committed by Brad Fitzpatrick
parent bdf746caaa
commit 2ef340f271
1 changed files with 3 additions and 1 deletions
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4
src/reflect/type.go
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@ -289,9 +289,11 @@ const (
// It is embedded in other, public struct types, but always
// with a unique tag like `reflect:"array"` or `reflect:"ptr"`
// so that code cannot convert from, say, *arrayType to *ptrType.
//
// rtype must be kept in sync with ../runtime/type.go:/^type._type.
type rtype struct {
size uintptr
ptrdata uintptr
ptrdata uintptr // number of bytes in the type that can contain pointers
hash uint32 // hash of type; avoids computation in hash tables
tflag tflag // extra type information flags
align uint8 // alignment of variable with this type