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cbdd069279
"result" is a tad bit too generic to provide a clash-free experience -
we found instances in LibJS where this breaks already. Essentially this
doesn't work:
auto foo = TRY(bar(result));
Because it expands to the following within the TRY() scope:
{
auto result = bar(result);
...
}
And that of course fails:
error: use of ‘result’ before deduction of ‘auto’
The simple solution here is to use a name that is much less likely to
clash with anything used in the expression ("_temporary_result"). :^)
18 lines
613 B
C
18 lines
613 B
C
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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// NOTE: This macro works with any result type that has the expected APIs.
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// It's designed with AK::Result and Kernel::KResult in mind.
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#define TRY(expression) \
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({ \
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auto _temporary_result = (expression); \
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if (_temporary_result.is_error()) \
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return _temporary_result.release_error(); \
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_temporary_result.release_value(); \
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})
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