50 lines
1.0 KiB
V
50 lines
1.0 KiB
V
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module main
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interface Speaker {
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say() string
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}
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struct ChatRoom {
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mut:
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talkers map[string]Speaker
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}
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fn new_room() &ChatRoom {
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return &ChatRoom{
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talkers: map[string]Speaker
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}
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}
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fn (r mut ChatRoom) add(name string, s Speaker) {
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r.talkers[name] = s
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}
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fn test_using_a_map_of_speaker_interfaces(){
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mut room := new_room()
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room.add('my cat', Cat{name: 'Tigga'} )
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room.add('my dog', Dog{name: 'Pirin'} )
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room.add('stray dog', Dog{name: 'Anoni'} )
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room.add('me', Human{name: 'Bilbo'} )
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room.add('she', Human{name: 'Maria'} )
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mut text := ''
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for name, subject in room.talkers {
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line := '${name:12s}: ${subject.say()}'
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println(line)
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text += line
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}
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assert text.contains(' meows ')
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assert text.contains(' barks ')
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assert text.contains(' says ')
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}
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//
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struct Cat { name string }
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fn (c &Cat) say() string { return '${c.name} meows "MEOW!"' }
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struct Dog { name string }
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fn (d &Dog) say() string { return '${d.name} barks "Bau Bau!"' }
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struct Human { name string }
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fn (h &Human) say() string { return '${h.name} says "Hello"' }
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