reflect2

reflect api that avoids runtime reflect.Value cost
- reflect get/set interface{}, with type checking
- reflect get/set unsafe.Pointer, without type checking
reflect2.TypeByName
works like Class.forName
found in java
json-iterator use this package to save runtime dispatching cost.
This package is designed for low level libraries to optimize reflection performance.
General application should still use reflect standard library.
reflect2.TypeByName
type MyStruct struct {
}
reflect2.TypeByName("awesome-package.MyStruct")
reflect2 get/set interface{}
valType := reflect2.TypeOf(1)
i := 1
j := 10
valType.Set(&i, &j)
to get set type
, always use its pointer *type
reflect2 get/set unsafe.Pointer
valType := reflect2.TypeOf(1)
i := 1
j := 10
valType.UnsafeSet(unsafe.Pointer(&i), unsafe.Pointer(&j))
to get set type
, always use its pointer *type
benchmark
Benchmark is not necessary for this package. It does nothing actually.
As it is just a thin wrapper to make go runtime public.
Both reflect2
and reflect
call same function
provided by runtime
package exposed by go language.
unsafe safety
Instead of casting []byte
to sliceHeader
in your application using unsafe.
We can use reflect2 instead. This way, if sliceHeader
changes in the future,
only reflect2 need to be upgraded.
reflect2 tries its best to keep the implementation same as reflect (by testing).