/* -*- 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
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