commit | bb009fe4c684774b0e193ddab879aa78edca1d10 | [log] [tgz] |
---|---|---|
author | Mikko Ylinen <mikko.ylinen@intel.com> | Tue Mar 03 09:51:18 2020 |
committer | Mikko Ylinen <mikko.ylinen@intel.com> | Thu Dec 31 07:38:35 2020 |
tree | 1c30c450563bb23f3b4d70d70b4bba7fd9d0e5c1 | |
parent | 7e6ae53ffa0b80243b941dafd23e2c78e2f24135 [diff] |
drop legacy Go support Go 1.9 was released in August 2017 so it's safe to make a claim that projects are already using new enough Go version. Tested with: $ go version go version go1.13.8 linux/amd64 $ GO111MODULE=off ./test.sh ok github.com/modern-go/reflect2-tests 0.005s coverage: 12.3% of statements in github.com/modern-go/reflect2 ok github.com/modern-go/reflect2-tests/test15 0.004s coverage: 6.4% of statements in github.com/modern-go/reflect2 ok github.com/modern-go/reflect2-tests/tests 0.010s coverage: 65.4% of statements in github.com/modern-go/reflect2 Signed-off-by: Mikko Ylinen <mikko.ylinen@intel.com>
reflect api that avoids runtime reflect.Value cost
reflect2.TypeByName
works like Class.forName
found in javajson-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.
// 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
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
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 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.
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).