mirror of https://gitee.com/bigwinds/arangodb
72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2017 ArangoDB GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_ENUM_ITERATOR_H
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#define ARANGODB_BASICS_ENUM_ITERATOR_H 1
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#include "Basics/Common.h"
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#include <type_traits>
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#define ENUM_ITERATOR(type, start, end) \
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arangodb::EnumIterator<type, type::start, type::end>()
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namespace arangodb {
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/// @brief Iterator for an enum class type
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/// will work only when the enum values are unique, contiguous and
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/// sorted in order
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template <typename T, T beginValue, T endValue>
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class EnumIterator {
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typedef typename std::underlying_type<T>::type ValueType;
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public:
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EnumIterator(T const& current) noexcept
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: current(static_cast<ValueType>(current)) {}
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EnumIterator() : current(static_cast<ValueType>(beginValue)) {}
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EnumIterator operator++() noexcept {
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++current;
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return *this;
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}
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T operator*() noexcept { return static_cast<T>(current); }
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EnumIterator begin() noexcept { return *this; }
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EnumIterator end() noexcept {
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static const EnumIterator endIter = ++EnumIterator(endValue);
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return endIter;
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}
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bool operator!=(EnumIterator const& other) const noexcept {
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return current != other.current;
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}
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private:
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int current;
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};
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} // namespace arangodb
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#endif
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