package main

/**
 * Methods in Go are statically dispatched.   That is,
 * The method executed is based on the type of the variable
 * at the time the method is called
 *
 * author ggtowell
 * created: Sep 2022
 */
import "fmt"

type sOne struct {
	intOne int
	floatOne float32
}

func (obj sOne) String() string {
	return fmt.Sprintf("sOne intOne:%v   floatOne:%v", obj.intOne, obj.floatOne)
}

type sTwo sOne
func (obj sTwo) String() string {
	return fmt.Sprintf("sTwo intOne:%v   floatOne:%v", obj.intOne, obj.floatOne)
}

type anInt int32
type bnInt anInt

// You cannot define a method on a base type 
// but you can on a type from a base
func (item anInt) String() string {
	//return fmt.Sprintf("anInt %v", item) // recursion problem -- %v wants to call the String() method
	return fmt.Sprintf("anInt %d", item)
}
func (item bnInt) String() string {
	//return fmt.Sprintf("bnInt %v", item) // recursion problem
	return fmt.Sprintf("bnInt %d", item)
}
func prA(item sOne) {
	fmt.Printf("      %v\n", item)
}

func main() {
	asOne := sOne{1, 1.61}
	fmt.Printf("ONE %v\n", asOne)
	asTwo := sTwo{2, 3.1415} // 
	fmt.Printf("TWO %v\n", asTwo)
	fmt.Println("Print sOne instance from function")
	prA(asOne)
	fmt.Println("Print sTwo instance from function (explicit cast required)")
	prA(sOne(asTwo))
	fmt.Printf("\n\n")
	
	ii := 6
	ai1 := anInt(ii)
	fmt.Printf("ai1 %v\n", ai1)
	bi1 := bnInt(ai1)
	fmt.Printf("bi1 %v\n", bi1)

}