62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
/*
|
|
* Copyright (C) 2022 The Android Open Source Project
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <algorithm>
|
|
|
|
#include "common/libs/utils/result.h"
|
|
|
|
namespace cuttlefish {
|
|
|
|
/**
|
|
* return all the elements in container that satisfies predicate.
|
|
*
|
|
* Container could be mostly any type, and Set should be any sort of set.
|
|
*/
|
|
template <typename T, typename Set, typename Container>
|
|
Set Collect(const Container& container,
|
|
std::function<bool(const T&)> predicate) {
|
|
Set output;
|
|
std::copy_if(container.cbegin(), container.cend(),
|
|
std::inserter(output, output.end()), predicate);
|
|
return output;
|
|
}
|
|
|
|
/**
|
|
* Collect all Ts from each container inside the "Containers"
|
|
*
|
|
* Containers are a set/list of Container. Container can be viewed as a set/list
|
|
* of Ts.
|
|
*
|
|
*/
|
|
template <typename T, typename Set, typename Containers>
|
|
Set Flatten(const Containers& containers) {
|
|
Set output;
|
|
for (const auto& container : containers) {
|
|
output.insert(container.cbegin(), container.cend());
|
|
}
|
|
return output;
|
|
}
|
|
|
|
template <typename S>
|
|
Result<typename std::remove_reference<S>::type> AtMostN(S&& s, const size_t n) {
|
|
CF_EXPECT(s.size() <= n);
|
|
return {std::forward<S>(s)};
|
|
}
|
|
|
|
} // namespace cuttlefish
|