24 lines
635 B
Go
24 lines
635 B
Go
package danger
|
|
|
|
import (
|
|
"reflect"
|
|
"unsafe"
|
|
)
|
|
|
|
// typeID is used as key in encoder and decoder caches to enable using
|
|
// the optimize runtime.mapaccess2_fast64 function instead of the more
|
|
// expensive lookup if we were to use reflect.Type as map key.
|
|
//
|
|
// typeID holds the pointer to the reflect.Type value, which is unique
|
|
// in the program.
|
|
//
|
|
// https://github.com/segmentio/encoding/blob/master/json/codec.go#L59-L61
|
|
type TypeID unsafe.Pointer
|
|
|
|
func MakeTypeID(t reflect.Type) TypeID {
|
|
// reflect.Type has the fields:
|
|
// typ unsafe.Pointer
|
|
// ptr unsafe.Pointer
|
|
return TypeID((*[2]unsafe.Pointer)(unsafe.Pointer(&t))[1])
|
|
}
|