2014-10-29 16:27:48 -04:00
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#ifndef OSMIUM_MEMORY_COLLECTION_HPP
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#define OSMIUM_MEMORY_COLLECTION_HPP
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/*
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This file is part of Osmium (http://osmcode.org/libosmium).
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Copyright 2013,2014 Jochen Topf <jochen@topf.org> and others (see README).
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <iterator>
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#include <iosfwd>
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#include <type_traits>
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#include <osmium/memory/item.hpp>
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namespace osmium {
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namespace memory {
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template <class TMember>
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class CollectionIterator : public std::iterator<std::forward_iterator_tag, TMember> {
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// This data_type is either 'unsigned char*' or 'const unsigned char*' depending
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// on whether TMember is const. This allows this class to be used as an iterator and
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// as a const_iterator.
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typedef typename std::conditional<std::is_const<TMember>::value, const unsigned char*, unsigned char*>::type data_type;
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data_type m_data;
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public:
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CollectionIterator() noexcept :
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m_data(nullptr) {
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}
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CollectionIterator(data_type data) noexcept :
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m_data(data) {
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}
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CollectionIterator<TMember>& operator++() {
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m_data = reinterpret_cast<TMember*>(m_data)->next();
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return *static_cast<CollectionIterator<TMember>*>(this);
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}
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CollectionIterator<TMember> operator++(int) {
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CollectionIterator<TMember> tmp(*this);
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operator++();
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return tmp;
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}
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bool operator==(const CollectionIterator<TMember>& rhs) const noexcept {
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return m_data == rhs.m_data;
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}
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bool operator!=(const CollectionIterator<TMember>& rhs) const noexcept {
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return m_data != rhs.m_data;
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}
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unsigned char* data() const noexcept {
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return m_data;
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}
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TMember& operator*() const {
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return *reinterpret_cast<TMember*>(m_data);
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}
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TMember* operator->() const {
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return reinterpret_cast<TMember*>(m_data);
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}
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template <typename TChar, typename TTraits>
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friend std::basic_ostream<TChar, TTraits>& operator<<(std::basic_ostream<TChar, TTraits>& out, const CollectionIterator<TMember>& iter) {
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return out << static_cast<const void*>(iter.m_data);
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}
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}; // class CollectionIterator
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template <class TMember, osmium::item_type TCollectionItemType>
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class Collection : public Item {
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public:
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typedef CollectionIterator<TMember> iterator;
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typedef CollectionIterator<const TMember> const_iterator;
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typedef TMember value_type;
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static constexpr osmium::item_type itemtype = TCollectionItemType;
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Collection() :
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Item(sizeof(Collection<TMember, TCollectionItemType>), TCollectionItemType) {
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}
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bool empty() const {
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return sizeof(Collection<TMember, TCollectionItemType>) == byte_size();
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}
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iterator begin() {
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return iterator(data() + sizeof(Collection<TMember, TCollectionItemType>));
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}
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iterator end() {
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return iterator(data() + byte_size());
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}
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const_iterator cbegin() const {
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return const_iterator(data() + sizeof(Collection<TMember, TCollectionItemType>));
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}
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const_iterator cend() const {
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return const_iterator(data() + byte_size());
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}
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const_iterator begin() const {
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return cbegin();
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}
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const_iterator end() const {
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return cend();
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}
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}; // class Collection
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} // namespace memory
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} // namespace osmium
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#endif // OSMIUM_MEMORY_COLLECTION_HPP
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