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// Copyright 2021 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef GRPC_SRC_CORE_LIB_PROMISE_JOIN_H
#define GRPC_SRC_CORE_LIB_PROMISE_JOIN_H
#include <grpc/support/port_platform.h>
#include "absl/meta/type_traits.h"
#include "src/core/lib/promise/detail/basic_join.h"
namespace grpc_core {
namespace promise_detail {
struct JoinTraits {
template <typename T>
using ResultType = absl::remove_reference_t<T>;
template <typename T, typename F>
static auto OnResult(T result, F kontinue)
-> decltype(kontinue(std::move(result))) {
return kontinue(std::move(result));
}
template <typename T>
static T Wrap(T x) {
return x;
}
};
template <typename... Promises>
using Join = BasicJoin<JoinTraits, Promises...>;
} // namespace promise_detail
/// Combinator to run all promises to completion, and return a tuple
/// of their results.
template <typename... Promise>
promise_detail::Join<Promise...> Join(Promise... promises) {
return promise_detail::Join<Promise...>(std::move(promises)...);
}
} // namespace grpc_core
#endif // GRPC_SRC_CORE_LIB_PROMISE_JOIN_H