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doc: fix Interfaces example (#6499)

pull/6510/head
Andrei Kurhan 2020-09-30 08:42:23 +03:00 committed by GitHub
parent 4cd5153b32
commit 763ddf78f3
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1 changed files with 9 additions and 4 deletions
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@ -1440,8 +1440,12 @@ particularly useful for initializing a C library.
### Interfaces ### Interfaces
```v ```v
struct Dog {} struct Dog {
struct Cat {} breed string
}
struct Cat {
}
fn (d Dog) speak() string { fn (d Dog) speak() string {
return 'woof' return 'woof'
@ -1458,15 +1462,16 @@ interface Speaker {
fn perform(s Speaker) string { fn perform(s Speaker) string {
if s is Dog { // use `is` to check the underlying type of an interface if s is Dog { // use `is` to check the underlying type of an interface
println('perform(dog)') println('perform(dog)')
println(s.breed) // `s` is automatically cast to `Dog` (smart cast) println(s.breed) // `s` is automatically cast to `Dog` (smart cast)
} else if s is Cat { } else if s is Cat {
println('perform(cat)') println('perform(cat)')
} }
return s.speak() return s.speak()
} }
dog := Dog{} dog := Dog{'Leonberger'}
cat := Cat{} cat := Cat{}
println(perform(dog)) // "woof" println(perform(dog)) // "woof"
println(perform(cat)) // "meow" println(perform(cat)) // "meow"
``` ```