mirror of
https://github.com/golang/go
synced 2024-11-13 18:00:30 -07:00
113 lines
1.3 KiB
Go
113 lines
1.3 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Implicit methods for embedded types.
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// Mixed pointer and non-pointer receivers.
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package main
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type T int
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var nv, np int
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func (t T) V() {
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if t != 42 {
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panic(t)
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}
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nv++
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}
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func (t *T) P() {
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if *t != 42 {
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panic(t, *t)
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}
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np++
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}
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type V interface { V() }
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type P interface { P(); V() }
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type S struct {
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T;
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}
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type SP struct {
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*T;
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}
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func main() {
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var t T;
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var v V;
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var p P;
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t = 42;
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t.P();
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t.V();
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v = t;
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v.V();
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p = &t;
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p.P();
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p.V();
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v = &t;
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v.V();
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// p = t; // ERROR
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var i interface{} = t;
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if _, ok := i.(P); ok {
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panicln("dynamic i.(P) succeeded incorrectly");
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}
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// println("--struct--");
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var s S;
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s.T = 42;
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s.P();
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s.V();
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v = s;
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s.V();
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p = &s;
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p.P();
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p.V();
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v = &s;
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v.V();
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// p = s; // ERROR
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var j interface{} = s;
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if _, ok := j.(P); ok {
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panicln("dynamic j.(P) succeeded incorrectly");
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}
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// println("--struct pointer--");
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var sp SP;
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sp.T = &t;
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sp.P();
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sp.V();
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v = sp;
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sp.V();
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p = &sp;
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p.P();
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p.V();
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v = &sp;
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v.V();
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p = sp; // not error
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p.P();
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p.V();
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if nv != 13 || np != 7 {
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panicln("bad count", nv, np)
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}
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}
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