1/*
2 * Copyright 2014-present Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#pragma once
18#define FOLLY_GEN_PARALLELMAP_H_
19
20#include <folly/gen/Core.h>
21
22namespace folly {
23namespace gen {
24
25namespace detail {
26
27template <class Predicate>
28class PMap;
29
30} // namespace detail
31
32/**
33 * Run `pred` in parallel in nThreads. Results are returned in the
34 * same order in which they were retrieved from the source generator
35 * (similar to map).
36 *
37 * NOTE: Only `pred` is run from separate threads; the source
38 * generator and the rest of the pipeline is executed in the
39 * caller thread.
40 */
41template <class Predicate, class PMap = detail::PMap<Predicate>>
42PMap pmap(Predicate pred = Predicate(), size_t nThreads = 0) {
43 return PMap(std::move(pred), nThreads);
44}
45} // namespace gen
46} // namespace folly
47
48#include <folly/gen/ParallelMap-inl.h>
49