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tdactor/td/actor/MultiPromise.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+#include "td/actor/PromiseFuture.h"
+
+namespace td {
+namespace detail {
+class MultiPromiseImpl;
+}
+
+class MultiPromise {
+  using Impl = detail::MultiPromiseImpl;
+
+ public:
+  struct Options {
+    Options() {
+    }
+    bool ignore_errors{false};
+  };
+  explicit MultiPromise(Options options = Options{}) : options_(options) {
+  }
+
+  struct InitGuard {
+   public:
+    InitGuard() = default;
+    InitGuard(std::shared_ptr<Impl> impl) : impl_(std::move(impl)) {
+    }
+    InitGuard(InitGuard &&other) = default;
+    InitGuard &operator=(InitGuard &&other) = default;
+    InitGuard(const InitGuard &other) = delete;
+    InitGuard &operator=(const InitGuard &other) = delete;
+
+    void add_promise(Promise<> promise);
+    Promise<> get_promise();
+    bool empty() const;
+    explicit operator bool() const;
+
+   private:
+    std::shared_ptr<Impl> impl_;
+  };
+
+  TD_WARN_UNUSED_RESULT InitGuard init_guard();
+  TD_WARN_UNUSED_RESULT InitGuard add_promise_or_init(Promise<> promise);
+
+ private:
+  Options options_;
+  std::weak_ptr<Impl> impl_;
+};
+}  // namespace td