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tar/storage: switch to map[string]struct{} for set

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Using an empty struct is more idiomatic/efficient for representing a
set-like container.
This commit is contained in:
Jonathan Boulle 2015-06-23 13:13:54 -07:00 committed by Vincent Batts
parent 002d19f0b0
commit caf6a872c9
1 changed files with 3 additions and 7 deletions
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10
tar/storage/packer.go
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@ -65,7 +65,7 @@ func (jup *jsonUnpacker) Next() (*Entry, error) {
if _, ok := jup.seen[cName]; ok { if _, ok := jup.seen[cName]; ok {
return nil, ErrDuplicatePath return nil, ErrDuplicatePath
} }
jup.seen[cName] = emptyByte jup.seen[cName] = struct{}{}
} }
return &e, err return &e, err
@ -90,11 +90,7 @@ type jsonPacker struct {
seen seenNames seen seenNames
} }
type seenNames map[string]byte type seenNames map[string]struct{}
// used in the seenNames map. byte is a uint8, and we'll re-use the same one
// for minimalism.
const emptyByte byte = 0
func (jp *jsonPacker) AddEntry(e Entry) (int, error) { func (jp *jsonPacker) AddEntry(e Entry) (int, error) {
// check early for dup name // check early for dup name
@ -103,7 +99,7 @@ func (jp *jsonPacker) AddEntry(e Entry) (int, error) {
if _, ok := jp.seen[cName]; ok { if _, ok := jp.seen[cName]; ok {
return -1, ErrDuplicatePath return -1, ErrDuplicatePath
} }
jp.seen[cName] = emptyByte jp.seen[cName] = struct{}{}
} }
e.Position = jp.pos e.Position = jp.pos