gofield 
High-performance struct field accessor based on unsafe pointers.
- Compared to
reflect, it improves performance by two to ten times - The more complex the struct, the more obvious the performance advantage
- Support to operate of non-exported fields
- Use unsafe and pre-analysis of types to improve performance
- Very simple operation interface
Example
func Example() {
type B struct {
b int
}
type A struct {
a string
b *B
}
var v A
v.a = "x"
s := gofield.MustAccess(&v)
fmt.Println(s.NumField()) // 3
a := s.FieldValue(0)
fmt.Println(a.String()) // x
a.SetString("y")
fmt.Println(a.String()) // y
b := s.FieldValue(2)
fmt.Println(b.Int()) // 0
b.SetInt(1)
fmt.Println(b.Int()) // 1
// output:
// 3
// x
// y
// 0
// 1
}Benchmark
- Various
goos: darwin
goarch: amd64
pkg: github.com/henrylee2cn/gofield
BenchmarkTag_Gofield1
BenchmarkTag_Gofield1-4 1952533 579 ns/op 296 B/op 7 allocs/op
BenchmarkTag_Reflect1
BenchmarkTag_Reflect1-4 246312 4629 ns/op 856 B/op 53 allocs/op
BenchmarkNested_Gofield2
BenchmarkNested_Gofield2-4 1703742 810 ns/op 176 B/op 8 allocs/op
BenchmarkNested_Reflect2
BenchmarkNested_Reflect2-4 468402 2443 ns/op 288 B/op 26 allocs/op
BenchmarkNested_Gofield1
BenchmarkNested_Gofield1-4 1570126 598 ns/op 176 B/op 8 allocs/op
BenchmarkNested_Reflect1
BenchmarkNested_Reflect1-4 1493688 814 ns/op 112 B/op 6 allocs/op
PASS- Overall
name reflect time/op gofield time/op delta
overall-4 2.52µs ±96% 0.66µs ±11% -73.96% (p=0.000 n=90+88)
name reflect alloc/op gofield alloc/op delta
overall-4 419B ±104% 216B ±37% ~ (p=0.186 n=90+90)
name reflect allocs/op gofield allocs/op delta
overall-4 28.3 ±87% 7.7 ± 9% -72.94% (p=0.000 n=90+90)