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Provide conversion to string $ for Results

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This commit is contained in:
Mark Spanbroek 2022-01-12 10:49:30 +01:00
parent b18444a6d0
commit 23c44bf764
2 changed files with 10 additions and 0 deletions
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6
questionable/results.nim
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@ -73,6 +73,12 @@ proc isFailure*[T](value: ?!T): bool =
value.isErr value.isErr
proc `$`*[T](value: ?!T): string =
if value.isSuccess:
"success(" & $(!value) & ")"
else:
"failure(\"" & $(value.error.msg) & "\")"
template `->?`*[T,U](value: ?!T, expression: ?!U): ?!U = template `->?`*[T,U](value: ?!T, expression: ?!U): ?!U =
if value.isFailure: if value.isFailure:
U.failure(value.error) U.failure(value.error)

4
testmodules/results/test.nim
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@ -14,6 +14,10 @@ suite "result":
check (?!string is Result[string, ref CatchableError]) check (?!string is Result[string, ref CatchableError])
check (?!seq[bool] is Result[seq[bool], ref CatchableError]) check (?!seq[bool] is Result[seq[bool], ref CatchableError])
test "conversion to string $ works for ?!Types":
check $42.success == "success(42)"
check $(int.failure "some error") == "failure(\"some error\")"
test "! gets value or raises Defect": test "! gets value or raises Defect":
check !42.success == 42 check !42.success == 42
expect Defect: discard !int.failure error expect Defect: discard !int.failure error