| // Copyright 2014 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. |
| |
| package interfaces |
| |
| type I interface { |
| Rand() int32 |
| } |
| |
| type SameI interface { |
| Rand() int32 |
| } |
| |
| type LargerI interface { |
| Rand() int32 |
| AnotherFunc() |
| } |
| |
| func Add3(r I) int32 { |
| return r.Rand() + r.Rand() + r.Rand() |
| } |
| |
| // chosen by fair dice roll. |
| // guaranteed to be random. |
| type seven struct{} |
| |
| func (seven) Rand() int32 { return 7 } |
| |
| func Seven() I { return seven{} } |
| |
| type WithParam interface { |
| HasParam(p bool) |
| } |
| |
| type Error interface { |
| Err() error |
| } |
| |
| func CallErr(e Error) error { |
| return e.Err() |
| } |
| |
| // not implementable |
| type I1 interface { |
| J() |
| H() *seven // not bound |
| } |
| |
| // not implementable |
| type I2 interface { |
| f() |
| G() |
| } |
| |
| // implementable |
| // (the implementor has to find a source of I1s) |
| type I3 interface { |
| F() I1 |
| } |
| |
| // not bound |
| func F() seven { return seven{} } |
| func G(u seven) {} |