7cb1c10fed
get0() dates back from the days where Seastar futures carried tuples, and get0() was a way to get the first (and usually only) element. Now it's a distraction, and Seastar is likely to deprecate and remove it. Replace with seastar::future::get(), which does the same thing.
70 lines
1.4 KiB
C++
70 lines
1.4 KiB
C++
/*
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* Copyright 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#include <type_traits>
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#include <memory>
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#include <seastar/core/future.hh>
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#include "seastarx.hh"
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#pragma once
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//
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// Utility for adapting types which are not nothrow move constructible into such
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// by wrapping them if necessary.
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//
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// Example usage:
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//
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// T val{};
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// using traits = noexcept_movable<T>;
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// auto f = make_ready_future<typename traits::type>(traits::wrap(std::move(val)));
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// T val2 = traits::unwrap(f.get());
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//
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template<typename T>
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struct noexcept_movable;
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template<typename T>
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requires std::is_nothrow_move_constructible_v<T>
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struct noexcept_movable<T> {
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using type = T;
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static type wrap(T&& v) {
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return std::move(v);
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}
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static future<T> wrap(future<T>&& v) {
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return std::move(v);
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}
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static T unwrap(type&& v) {
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return std::move(v);
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}
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static future<T> unwrap(future<type>&& v) {
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return std::move(v);
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}
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};
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template<typename T>
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requires (!std::is_nothrow_move_constructible_v<T>)
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struct noexcept_movable<T> {
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using type = std::unique_ptr<T>;
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static type wrap(T&& v) {
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return std::make_unique<T>(std::move(v));
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}
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static T unwrap(type&& v) {
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return std::move(*v);
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}
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};
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template<typename T>
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using noexcept_movable_t = typename noexcept_movable<T>::type;
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