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42 lines
1.7 KiB
C
42 lines
1.7 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=8 sts=2 et sw=2 tw=80:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_Try_h
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#define mozilla_Try_h
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#include "mozilla/Result.h"
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/**
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* MOZ_TRY(expr) is the C++ equivalent of Rust's `try!(expr);`. First, it
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* evaluates expr, which must produce a Result value. On success, it
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* discards the result altogether. On error, it immediately returns an error
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* Result from the enclosing function.
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*/
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#define MOZ_TRY(expr) \
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do { \
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auto mozTryTempResult_ = ::mozilla::ToResult(expr); \
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if (MOZ_UNLIKELY(mozTryTempResult_.isErr())) { \
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return mozTryTempResult_.propagateErr(); \
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} \
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} while (0)
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/**
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* MOZ_TRY_VAR(target, expr) is the C++ equivalent of Rust's `target =
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* try!(expr);`. First, it evaluates expr, which must produce a Result value. On
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* success, the result's success value is assigned to target. On error,
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* immediately returns the error result. |target| must be an lvalue.
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*/
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#define MOZ_TRY_VAR(target, expr) \
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do { \
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auto mozTryVarTempResult_ = (expr); \
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if (MOZ_UNLIKELY(mozTryVarTempResult_.isErr())) { \
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return mozTryVarTempResult_.propagateErr(); \
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} \
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(target) = mozTryVarTempResult_.unwrap(); \
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} while (0)
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#endif // mozilla_Try_h
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