reflect: Type.Field allocates

[rsc]

it's the only thing in Type that allocates.  avoid.

    f.Index = []int{i}

[rsc]

Comment 1:

Labels changed: added priority-later, removed priority-medium.

[rsc]

Comment 2:

Labels changed: added priority-go1.

[remyoudompheng]

Comment 3:

Why is StructField.Index a slice ? It would make sense if FieldByIndex([]int) would
actually return the same slice argument in the Index field, but it seems it is not the
case and it always returns a slice of length 1 there.
Is it for embedded structs ?

[rsc]

Comment 4:

Yes, it is because FieldByName returns a Field with a slice in it.

[robpike]

Comment 5:

Owner changed to builder@golang.org.

[bradfitz]

Comment 7:

http://golang.org/cl/5564066

Owner changed to @bradfitz.

Status changed to Started.

[bradfitz]

Comment 8:

Also, Russ's earlier version with read-only memory:
http://golang.org/cl/5371098
Pushing out past Go1.  No super compelling argument for it.

Labels changed: added priority-later, removed priority-go1.

Owner changed to builder@golang.org.

[rsc]

Comment 9:

Labels changed: added go1.1.

[rsc]

Comment 10:

Labels changed: added size-m.

[rsc]

Comment 11:

Per discussion on https://golang.org/cl/5371098, we've decided the drawbacks
outweigh the benefits. If the pendulum ever swings back, the CL is there.

Status changed to WorkingAsIntended.