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47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
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/*
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* Copyright 2016 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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namespace folly {
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namespace detail {
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template <typename... Ts>
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struct TryTuple {
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template <typename... Ts2>
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static std::tuple<Ts...> unwrap(
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std::tuple<folly::Try<Ts>...>&& o,
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Ts2&&... ts2) {
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static_assert(
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sizeof...(ts2) < std::tuple_size<std::tuple<folly::Try<Ts>...>>::value,
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"Non-templated unwrap should be used instead");
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return unwrap(
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std::move(o),
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std::forward<Ts2>(ts2)...,
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std::move(*std::get<sizeof...(ts2)>(o)));
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}
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static std::tuple<Ts...> unwrap(
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std::tuple<folly::Try<Ts>...>&& /* o */,
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Ts&&... ts) {
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return std::tuple<Ts...>(std::forward<Ts>(ts)...);
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}
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};
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} // namespace detail
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} // namespace folly
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