Unknwon 5e158b51db vendor: add new dependencies 6 years ago
..
Gopkg.lock 5e158b51db vendor: add new dependencies 6 years ago
Gopkg.toml 5e158b51db vendor: add new dependencies 6 years ago
LICENSE 5e158b51db vendor: add new dependencies 6 years ago
README.md 5e158b51db vendor: add new dependencies 6 years ago
go_above_17.go 5e158b51db vendor: add new dependencies 6 years ago
go_above_19.go 5e158b51db vendor: add new dependencies 6 years ago
go_below_17.go 5e158b51db vendor: add new dependencies 6 years ago
go_below_19.go 5e158b51db vendor: add new dependencies 6 years ago
reflect2.go 5e158b51db vendor: add new dependencies 6 years ago
reflect2_amd64.s 5e158b51db vendor: add new dependencies 6 years ago
reflect2_kind.go 5e158b51db vendor: add new dependencies 6 years ago
relfect2_386.s 5e158b51db vendor: add new dependencies 6 years ago
relfect2_amd64p32.s 5e158b51db vendor: add new dependencies 6 years ago
relfect2_arm.s 5e158b51db vendor: add new dependencies 6 years ago
relfect2_arm64.s 5e158b51db vendor: add new dependencies 6 years ago
relfect2_mips64x.s 5e158b51db vendor: add new dependencies 6 years ago
relfect2_mipsx.s 5e158b51db vendor: add new dependencies 6 years ago
relfect2_ppc64x.s 5e158b51db vendor: add new dependencies 6 years ago
relfect2_s390x.s 5e158b51db vendor: add new dependencies 6 years ago
safe_field.go 5e158b51db vendor: add new dependencies 6 years ago
safe_map.go 5e158b51db vendor: add new dependencies 6 years ago
safe_slice.go 5e158b51db vendor: add new dependencies 6 years ago
safe_struct.go 5e158b51db vendor: add new dependencies 6 years ago
safe_type.go 5e158b51db vendor: add new dependencies 6 years ago
test.sh 5e158b51db vendor: add new dependencies 6 years ago
type_map.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_array.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_eface.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_field.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_iface.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_link.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_map.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_ptr.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_slice.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_struct.go 5e158b51db vendor: add new dependencies 6 years ago
unsafe_type.go 5e158b51db vendor: add new dependencies 6 years ago

README.md

reflect2

Sourcegraph GoDoc Build Status codecov rcard License

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

// given package is github.com/your/awesome-package
type MyStruct struct {
	// ...
}

// will return the type
reflect2.TypeByName("awesome-package.MyStruct")
// however, if the type has not been used
// it will be eliminated by compiler, so we can not get it in runtime

reflect2 get/set interface{}

valType := reflect2.TypeOf(1)
i := 1
j := 10
valType.Set(&i, &j)
// i will be 10

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))
// i will be 10

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).