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| from enum import Enum | |
| class ADTValue: | |
| __slots__=('adt','value') | |
| def __init__(self, adt, value): | |
| self.adt=adt | |
| self.value=value | |
| def __repr__(self): | |
| return f'{self.adt!r} of {self.value!r}' | |
| class ADT(Enum): | |
| def __call__(self, other): | |
| if not isinstance(other, ADTValue): | |
| print(f"fill values {self}, {other}") | |
| return ADTValue(self, other) | |
| if other.adt == self: | |
| return other.value | |
| return False | |
| class Result(ADT): | |
| Ok = ('T',) | |
| Err = ('E',) | |
| Quasi = {'r', 'err'} | |
| r = Result.Quasi([1, "hi"]) | |
| if v := Result.Ok(r): | |
| print("Ok.T=",v) | |
| elif e := Result.Err(r): | |
| print("Err.e=",e) | |
| elif q := Result.Quasi(r): | |
| [qr, qerr]=q | |
| print(f"Quasi.r={qr}, Quasi.err={qerr}") |
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