Created
October 20, 2017 13:48
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| abstract class Container < Widget | |
| includes CrystalClear | |
| @children = [] of Widget | |
| requires child.parent.nil? | |
| ensures @children.count child == 1 | |
| def add(child) | |
| @children << child | |
| child.parent = self | |
| end | |
| end |
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