116 строки
1,9 КиБ
Go
116 строки
1,9 КиБ
Go
package main
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func main() {
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thing := &Thing{"foo"}
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println("thing:", thing.String())
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thing.Print()
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printItf(5)
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printItf(byte('x'))
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printItf("foo")
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printItf(Foo(18))
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printItf(*thing)
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printItf(thing)
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printItf(Stringer(thing))
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printItf(Number(3))
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array := Array([4]uint32{1, 7, 11, 13})
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printItf(array)
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printItf(ArrayStruct{3, array})
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printItf(SmallPair{3, 5})
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s := Stringer(thing)
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println("Stringer.String():", s.String())
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var itf interface{} = s
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println("Stringer.(*Thing).String():", itf.(Stringer).String())
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}
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func printItf(val interface{}) {
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switch val := val.(type) {
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case Doubler:
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println("is Doubler:", val.Double())
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case Tuple:
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println("is Tuple:", val.Nth(0), val.Nth(1), val.Nth(2), val.Nth(3))
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val.Print()
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case int:
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println("is int:", val)
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case byte:
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println("is byte:", val)
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case string:
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println("is string:", val)
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case Thing:
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println("is Thing:", val.String())
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case *Thing:
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println("is *Thing:", val.String())
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case Foo:
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println("is Foo:", val)
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default:
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println("is ?")
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}
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}
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type Thing struct {
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name string
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}
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func (t Thing) String() string {
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return t.name
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}
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func (t Thing) Print() {
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println("Thing.Print:", t.name)
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}
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type Stringer interface {
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String() string
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}
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type Foo int
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type Number int
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func (n Number) Double() int {
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return int(n) * 2
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}
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type Doubler interface {
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Double() int
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}
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type Tuple interface {
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Nth(int) uint32
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Print()
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}
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type Array [4]uint32
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func (a Array) Nth(n int) uint32 {
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return a[n]
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}
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func (a Array) Print() {
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println("Array len:", len(a))
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}
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type ArrayStruct struct {
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n int
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a Array
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}
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func (a ArrayStruct) Nth(n int) uint32 {
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return a.a[n]
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}
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func (a ArrayStruct) Print() {
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println("ArrayStruct.Print:", len(a.a), a.n)
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}
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type SmallPair struct {
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a byte
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b byte
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}
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func (p SmallPair) Nth(n int) uint32 {
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return uint32(int(p.a)*n + int(p.b)*n)
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}
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func (p SmallPair) Print() {
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println("SmallPair.Print:", p.a, p.b)
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}
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