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reflect: document the unreliability of StringHeader and SliceHeader

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R=golang-dev, adg, dvyukov
CC=golang-dev
https://golang.org/cl/8494045
This commit is contained in:
Rob Pike 2013-04-07 18:42:47 -07:00
parent 78c4d50d25
commit 092c481c1b
1 changed files with 10 additions and 2 deletions
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12
src/pkg/reflect/value.go
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@ -1699,14 +1699,22 @@ func (v Value) UnsafeAddr() uintptr {
} }
// StringHeader is the runtime representation of a string. // StringHeader is the runtime representation of a string.
// It cannot be used safely or portably. // It cannot be used safely or portably and its representation may
// change in a later release.
// Moreover, the Data field is not sufficient to guarantee the data
// it references will not be garbage collected, so programs must keep
// a separate, correctly typed pointer to the underlying data.
type StringHeader struct { type StringHeader struct {
Data uintptr Data uintptr
Len int Len int
} }
// SliceHeader is the runtime representation of a slice. // SliceHeader is the runtime representation of a slice.
// It cannot be used safely or portably. // It cannot be used safely or portably and its representation may
// change in a later release.
// Moreover, the Data field is not sufficient to guarantee the data
// it references will not be garbage collected, so programs must keep
// a separate, correctly typed pointer to the underlying data.
type SliceHeader struct { type SliceHeader struct {
Data uintptr Data uintptr
Len int Len int