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