72 lines
1.5 KiB
C++
72 lines
1.5 KiB
C++
// Copyright 2015 The Weave Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef LIBWEAVE_INCLUDE_WEAVE_ENUM_TO_STRING_H_
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#define LIBWEAVE_INCLUDE_WEAVE_ENUM_TO_STRING_H_
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#include <string>
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#include <base/logging.h>
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namespace weave {
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// Helps to map enumeration to stings and back.
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//
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// Usage example:
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// .h file:
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// enum class MyEnum { kV1, kV2 };
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//
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// .cc file:
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// template <>
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// EnumToStringMap<MyEnum>::EnumToStringMap() : EnumToStringMap(kMap) { };
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template <typename T>
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class EnumToStringMap final {
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static_assert(std::is_enum<T>::value, "The type must be an enumeration");
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public:
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struct Map {
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const T id;
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const char* const name;
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};
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EnumToStringMap();
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const Map* begin() const { return begin_; }
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const Map* end() const { return end_; }
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private:
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template <size_t size>
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explicit EnumToStringMap(const Map (&map)[size])
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: begin_(map), end_(map + size) {}
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const Map* begin_;
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const Map* end_;
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};
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template <typename T>
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std::string EnumToString(T id) {
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for (const auto& m : EnumToStringMap<T>()) {
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if (m.id == id) {
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CHECK(m.name);
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return m.name;
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}
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}
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NOTREACHED() << static_cast<int>(id);
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return std::string();
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}
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template <typename T>
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bool StringToEnum(const std::string& name, T* id) {
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for (const auto& m : EnumToStringMap<T>()) {
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if (m.name && m.name == name) {
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*id = m.id;
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return true;
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}
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}
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return false;
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}
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} // namespace weave
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#endif // LIBWEAVE_INCLUDE_WEAVE_ENUM_TO_STRING_H_
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