go/test/interface/embed.go

// $G $D/$F.go && $L $F.$A && ./$A.out

// 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.

// Check methods derived from embedded interface and *interface values.

package main

import "os"

const Value = 1e12

type Inter interface { M() int64 }

type T int64
func (t T) M() int64 { return int64(t) }
var t = T(Value)
var pt = &t
var ti Inter = t
var pti = &ti

type S struct { Inter }
var s = S{ ti }
var ps = &s

type SP struct { *Inter }
var sp = SP{ &ti }
var psp = &sp

var i Inter
var pi = &i

var ok = true

func check(s string, v int64) {
	if v != Value {
		println(s, v);
		ok = false;
	}
}

func main() {
	check("t.M()", t.M());
	check("pt.M()", pt.M());
	check("ti.M()", ti.M());
	check("pti.M()", pti.M());
	check("s.M()", s.M());
	check("ps.M()", ps.M());
	check("sp.M()", sp.M());
	check("psp.M()", psp.M());

	i = t;
	check("i = t; i.M()", i.M());
	check("i = t; pi.M()", pi.M());

	i = pt;
	check("i = pt; i.M()", i.M());
	check("i = pt; pi.M()", pi.M());

	i = s;
	check("i = s; i.M()", i.M());
	check("i = s; pi.M()", pi.M());

	i = ps;
	check("i = ps; i.M()", i.M());
	check("i = ps; pi.M()", pi.M());

	i = sp;
	check("i = sp; i.M()", i.M());
	check("i = sp; pi.M()", pi.M());

	i = psp;
	check("i = psp; i.M()", i.M());
	check("i = psp; pi.M()", pi.M());

	if !ok {
		println("BUG: interface10");
		os.Exit(1)
	}
}