| commit | 6ee7638213944324cce8779775810fb0b6d06841 | |
| author | Thomas Leonard <talex5@gmail.com> | |
| Wed, 17 Sep 2008 19:25:19 +0000 (17 20:25 +0100) | ||
| committer | Thomas Leonard <talex5@gmail.com> | |
| Wed, 17 Sep 2008 20:14:23 +0000 (17 21:14 +0100) | ||
| tree | c562c78320c9969eec6fbac54dafb15b3e8336ad | treesnapshot (tar.gz zip) |
| parent | d856e0a8d1a549b722f71fa25600687ff40d5e46 | commitdiff |
Added Maybe type
The idea here is that pointers that can be null have a different type.
A normal class type cannot be null by default. Add a ? to the type to
indicate that it may be null. e.g. this method can only be called with
a non-null name, and never returns null:
Person lookup(char[] name):
...
This method can take and return nulls:
Person? lookup(char[]? name):
...
The idea here is that pointers that can be null have a different type.
A normal class type cannot be null by default. Add a ? to the type to
indicate that it may be null. e.g. this method can only be called with
a non-null name, and never returns null:
Person lookup(char[] name):
...
This method can take and return nulls:
Person? lookup(char[]? name):
...