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gob: beginning of support for GobEncoder/GobDecoder interfaces.

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This allows a data item that can marshal itself to be transmitted by its
own encoding, enabling some types to be handled that cannot be
normally, plus providing a way to use gobs on data with unexported
fields.

In this CL, the necessary methods are protected by leading _, so only
package gob can use the facilities (in its tests, of course); this
code is not ready for real use yet.  I could be talked into enabling
it for experimentation, though.  The main drawback is that the
methods must be implemented by the actual type passed through,
not by an indirection from it.  For instance, if *T implements
GobEncoder, you must send a *T, not a T.  This will be addressed
in due course.

Also there is improved commentary and a couple of unrelated
minor bug fixes.

R=rsc
CC=golang-dev
https://golang.org/cl/4243056
This commit is contained in:
Rob Pike 2011-03-04 12:25:18 -08:00
parent 7b563be516
commit c91daefb24
9 changed files with 939 additions and 178 deletions
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4
src/pkg/gob/codec_test.go
View file

@ -303,7 +303,7 @@ func TestScalarEncInstructions(t *testing.T) {
}
}
func execDec(typ string, instr *decInstr, state *decodeState, t *testing.T, p unsafe.Pointer) {
func execDec(typ string, instr *decInstr, state *decoderState, t *testing.T, p unsafe.Pointer) {
defer testError(t)
v := int(state.decodeUint())
if v+state.fieldnum != 6 {
@ -313,7 +313,7 @@ func execDec(typ string, instr *decInstr, state *decodeState, t *testing.T, p un
state.fieldnum = 6
}
func newDecodeStateFromData(data []byte) *decodeState {
func newDecodeStateFromData(data []byte) *decoderState {
b := bytes.NewBuffer(data)
state := newDecodeState(nil, b)
state.fieldnum = -1