Reflection / Primitive types / Essential Go
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package main
import (
"fmt"
"reflect"
)
func printType(v interface{}) {
rv := reflect.ValueOf(v)
typ := rv.Type()
typeName := ""
switch rv.Kind() {
case reflect.Ptr:
typeName = "pointer"
case reflect.Int:
typeName = "int"
case reflect.Int32:
typeName = "int32"
case reflect.String:
typeName = "string"
// ... handle more cases
default:
typeName = "unrecognized type"
}
fmt.Printf("v is of type '%s'. Size: %d bytes\n", typeName, typ.Size())
}
func main() {
printType(int32(3))
printType("")
i := 3
printType(&i) // *int i.e. pointer to int
}
Go
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