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d989c50c90
I'm not sure there's a material improvement from this patch. However, I've been reading the error handling code from multiple projects and was excited to see Serenity being able to handle assignment (`auto x = TRY(make_x())`) the same way as actions (`TRY(do_x())`). I think it's worth documenting that this is only possible due to non-standard extensions.
30 lines
1.1 KiB
C
30 lines
1.1 KiB
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 AK::Error in mind.
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//
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// It depends on a non-standard C++ extension, specifically
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// on statement expressions [1]. This is known to be implemented
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// by at least clang and gcc.
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// [1] https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html
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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()) [[unlikely]] \
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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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#define MUST(expression) \
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({ \
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auto _temporary_result = (expression); \
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VERIFY(!_temporary_result.is_error()); \
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_temporary_result.release_value(); \
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})
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