[NETD-BPF#1] Move libnetdutils to frameworks/libs/net/...
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
Ignore-AOSP-First: the netd change(same topic) would not automerge from
aosp.
No-Typo-Check: Clean code move with no other changes.
BYPASS_INCLUSIVE_LANGUAGE_REASON=Clean code move with no other changes.
Change-Id: I645bfe35f6543149c9a9f894cd4158d27a481abe
diff --git a/staticlibs/netd/libnetdutils/include/netdutils/Handle.h b/staticlibs/netd/libnetdutils/include/netdutils/Handle.h
new file mode 100644
index 0000000..82083d4
--- /dev/null
+++ b/staticlibs/netd/libnetdutils/include/netdutils/Handle.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#ifndef NETUTILS_HANDLE_H
+#define NETUTILS_HANDLE_H
+
+#include <ostream>
+
+namespace android {
+namespace netdutils {
+
+// Opaque, strongly typed wrapper for integer-like handles.
+// Explicitly avoids implementing arithmetic operations.
+//
+// This class is intended to avoid common errors when reordering
+// arguments to functions, typos and other cases where plain integer
+// types would silently cover up the mistake.
+//
+// usage:
+// DEFINE_HANDLE(ProductId, uint64_t);
+// DEFINE_HANDLE(ThumbnailHash, uint64_t);
+// void foo(ProductId p, ThumbnailHash th) {...}
+//
+// void test() {
+// ProductId p(88);
+// ThumbnailHash th1(100), th2(200);
+//
+// foo(p, th1); <- ok!
+// foo(th1, p); <- disallowed!
+// th1 += 10; <- disallowed!
+// p = th2; <- disallowed!
+// assert(th1 != th2); <- ok!
+// }
+template <typename T, typename TagT>
+class Handle {
+ public:
+ constexpr Handle() = default;
+ constexpr Handle(const T& value) : mValue(value) {}
+
+ const T get() const { return mValue; }
+
+ bool operator==(const Handle& that) const { return get() == that.get(); }
+ bool operator!=(const Handle& that) const { return get() != that.get(); }
+
+ private:
+ T mValue;
+};
+
+#define DEFINE_HANDLE(name, type) \
+ struct _##name##Tag {}; \
+ using name = ::android::netdutils::Handle<type, _##name##Tag>;
+
+template <typename T, typename TagT>
+inline std::ostream& operator<<(std::ostream& os, const Handle<T, TagT>& handle) {
+ return os << handle.get();
+}
+
+} // namespace netdutils
+} // namespace android
+
+#endif /* NETUTILS_HANDLE_H */