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Diffstat (limited to 'common/netd/libnetdutils/include/netdutils/Handle.h')
-rw-r--r-- | common/netd/libnetdutils/include/netdutils/Handle.h | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/common/netd/libnetdutils/include/netdutils/Handle.h b/common/netd/libnetdutils/include/netdutils/Handle.h deleted file mode 100644 index 82083d41..00000000 --- a/common/netd/libnetdutils/include/netdutils/Handle.h +++ /dev/null @@ -1,74 +0,0 @@ -/* - * 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 */ |