38cf698179
libnetdutils is referenced by netd.c and TrafficController.cpp, which are going to be mainlined. Therefore, move libnetdutils to a common place where both mainline module and platform code (Netd) can refer to. Bug: 202086915 Test: build; flash; cd system/netd; atest No-Typo-Check: Clean code move with no other changes. BYPASS_INCLUSIVE_LANGUAGE_REASON=Clean code move with no other changes. Merged-In: I645bfe35f6543149c9a9f894cd4158d27a481abe Change-Id: I645bfe35f6543149c9a9f894cd4158d27a481abe
64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef NETUTILS_MISC_H
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#define NETUTILS_MISC_H
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#include <map>
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namespace android {
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namespace netdutils {
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// Lookup key in map, returing a default value if key is not found
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template <typename U, typename V>
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inline const V& findWithDefault(const std::map<U, V>& map, const U& key, const V& dflt) {
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auto it = map.find(key);
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return (it == map.end()) ? dflt : it->second;
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}
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// Movable, copiable, scoped lambda (or std::function) runner. Useful
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// for running arbitrary cleanup or logging code when exiting a scope.
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//
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// Compare to defer in golang.
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template <typename FnT>
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class Cleanup {
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public:
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Cleanup() = delete;
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explicit Cleanup(FnT fn) : mFn(fn) {}
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~Cleanup() { if (!mReleased) mFn(); }
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void release() { mReleased = true; }
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private:
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bool mReleased{false};
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FnT mFn;
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};
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// Helper to make a new Cleanup. Avoids complex or impossible syntax
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// when wrapping lambdas.
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//
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// Usage:
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// auto cleanup = makeCleanup([](){ your_code_here; });
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template <typename FnT>
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Cleanup<FnT> makeCleanup(FnT fn) {
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return Cleanup<FnT>(fn);
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}
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} // namespace netdutils
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} // namespace android
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#endif /* NETUTILS_MISC_H */
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