36 lines
493 B
V
36 lines
493 B
V
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interface Iter<T> {
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next() ?T
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}
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fn (mut it Iter<T>) collect<T>() []T {
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mut data := []T{}
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for {
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val := it.next() or { break }
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data << val
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}
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return data
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}
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struct ArrayIter<T> {
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data []T
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mut:
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index int
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}
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fn (mut it ArrayIter<T>) next<T>() ?T {
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if it.index >= it.data.len {
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return none
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}
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defer {
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it.index++
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}
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return it.data[it.index]
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}
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fn test_generics_interface_method() {
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mut iter := Iter<int>(ArrayIter<int>{
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data: [1, 2, 3]
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})
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assert iter.collect() == [1, 2, 3]
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}
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