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Merge pull request #3859 from rw/go-zero-alloc-strings

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Go: Fix heap allocation when reading a string.
This commit is contained in:
Robert
2016-04-23 18:38:03 -07:00
parent a0d1161feb e8ac0f293e
commit ba7204a7b7
2 changed files with 7 additions and 1 deletions
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3
go/table.go
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@@ -26,7 +26,8 @@ func (t *Table) Indirect(off UOffsetT) UOffsetT {
// String gets a string from data stored inside the flatbuffer. // String gets a string from data stored inside the flatbuffer.
func (t *Table) String(off UOffsetT) string { func (t *Table) String(off UOffsetT) string {
return string(t.ByteVector(off)) b := t.ByteVector(off)
return byteSliceToString(b)
} }
// ByteVector gets a byte slice from data stored inside the flatbuffer. // ByteVector gets a byte slice from data stored inside the flatbuffer.

5
go/unsafe.go
View File

@@ -43,3 +43,8 @@ var (
// SizeVOffsetT is the byte size of an VOffsetT. // SizeVOffsetT is the byte size of an VOffsetT.
SizeVOffsetT = int(unsafe.Sizeof(VOffsetT(0))) SizeVOffsetT = int(unsafe.Sizeof(VOffsetT(0)))
) )
// byteSliceToString converts a []byte to string without a heap allocation.
func byteSliceToString(b []byte) string {
return *(*string)(unsafe.Pointer(&b))
}