intervar.go

     1  // run
     2  
     3  // Copyright 2009 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Test interface assignment.
     8  
     9  package main
    10  
    11  type	Iputs	interface {
    12  	puts	(s string) string;
    13  }
    14  
    15  // ---------
    16  
    17  type	Print	struct {
    18  	whoami	int;
    19  	put	Iputs;
    20  }
    21  
    22  func (p *Print) dop() string {
    23  	r := " print " + string(p.whoami + '0')
    24  	return r + p.put.puts("abc");
    25  }
    26  
    27  // ---------
    28  
    29  type	Bio	struct {
    30  	whoami	int;
    31  	put	Iputs;
    32  }
    33  
    34  func (b *Bio) puts(s string) string {
    35  	r := " bio " + string(b.whoami + '0')
    36  	return r + b.put.puts(s);
    37  }
    38  
    39  // ---------
    40  
    41  type	File	struct {
    42  	whoami	int;
    43  	put	Iputs;
    44  }
    45  
    46  func (f *File) puts(s string) string {
    47  	return " file " + string(f.whoami + '0') + " -- " + s
    48  }
    49  
    50  func
    51  main() {
    52  	p := new(Print);
    53  	b := new(Bio);
    54  	f := new(File);
    55  
    56  	p.whoami = 1;
    57  	p.put = b;
    58  
    59  	b.whoami = 2;
    60  	b.put = f;
    61  
    62  	f.whoami = 3;
    63  
    64  	r := p.dop();
    65  	expected := " print 1 bio 2 file 3 -- abc"
    66  	if r != expected {
    67  		panic(r + " != " + expected)
    68  	}
    69  }
    70
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