Difference between revisions of "New CAT call"
m (→Introcution) |
m (→Introcution) |
||
| Line 9: | Line 9: | ||
feature | feature | ||
f (a: ANY) do end | f (a: ANY) do end | ||
| + | end | ||
</code> | </code> | ||
| | | | ||
<code>[eiffel, n] | <code>[eiffel, n] | ||
class B | class B | ||
| + | inherit A redefine f end | ||
feature | feature | ||
f (a: STRING) do end -- not valid | f (a: STRING) do end -- not valid | ||
| + | end | ||
</code> | </code> | ||
| | | | ||
<code>[eiffel, n] | <code>[eiffel, n] | ||
class B | class B | ||
| + | inherit A redefine f end | ||
feature | feature | ||
f (a: ?STRING) do end -- valid | f (a: ?STRING) do end -- valid | ||
| + | end | ||
</code> | </code> | ||
|} | |} | ||
Revision as of 12:12, 27 October 2006
Introcution
The ECMA standard introduces a new solution to the CAT call problem. Covariant redefinition of a formal argument is only possible to an detatchable type:
class A feature f (a: ANY) do end end |
class B inherit A redefine f end feature f (a: STRING) do end -- not valid end |
class B inherit A redefine f end feature f (a: ?STRING) do end -- valid end |
