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Langref: Add example for catching some errors and narrowing the error set

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Sebastian Bensusan 2023-06-21 17:39:14 -04:00 committed by Veikka Tuominen
parent 6aa88ecc54
commit 64faaa7d8f
1 changed files with 17 additions and 1 deletions
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18
doc/langref.html.in
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@ -5584,7 +5584,7 @@ fn doAThing(str: []u8) !void {
appropriately.
</p>
<p>
Finally, you may want to take a different action for every situation. For that, we combine
You may want to take a different action for every situation. For that, we combine
the {#link|if#} and {#link|switch#} expression:
</p>
{#syntax_block|zig|handle_all_error_scenarios.zig#}
@ -5598,6 +5598,22 @@ fn doAThing(str: []u8) void {
// we promise that InvalidChar won't happen (or crash in debug mode if it does)
error.InvalidChar => unreachable,
}
}
{#end_syntax_block#}
<p>
Finally, you may want to handle only some errors. For that, you can capture the unhandled
errors in the {#syntax#}else{#endsyntax#} case, which now contains a narrower error set:
</p>
{#syntax_block|zig|handle_some_error_scenarios.zig#}
fn doAnotherThing(str: []u8) error{InvaidChar}!void {
if (parseU64(str, 10)) |number| {
doSomethingWithNumber(number);
} else |err| switch (err) {
error.Overflow => {
// handle overflow...
},
else => |leftover_err| return leftover_err,
}
}
{#end_syntax_block#}
<p>