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test/interface/receiver.go
121 строка
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Rob Pike
test/interface: document tests
19 фев 2012, 10:33
19 фев 2012, 10:33
13514d4
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// run // Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Test Implicit methods for embedded types and // mixed pointer and non-pointer receivers. package main type T int var nv, np int func (t T) V() { if t != 42 { panic(t) } nv++ } func (t *T) P() { if *t != 42 { println(t, *t) panic("fail") } np++ } type V interface { V() } type P interface { P() V() } type S struct { T } type SP struct { *T } func main() { var t T var v V var p P t = 42 t.P() t.V() v = t v.V() p = &t p.P() p.V() v = &t v.V() // p = t // ERROR var i interface{} = t if _, ok := i.(P); ok { println("dynamic i.(P) succeeded incorrectly") panic("fail") } // println("--struct--"); var s S s.T = 42 s.P() s.V() v = s s.V() p = &s p.P() p.V() v = &s v.V() // p = s // ERROR var j interface{} = s if _, ok := j.(P); ok { println("dynamic j.(P) succeeded incorrectly") panic("fail") } // println("--struct pointer--"); var sp SP sp.T = &t sp.P() sp.V() v = sp sp.V() p = &sp p.P() p.V() v = &sp v.V() p = sp // not error p.P() p.V() if nv != 13 || np != 7 { println("bad count", nv, np) panic("fail") } }