item.hpp
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#ifndef OSMIUM_MEMORY_ITEM_HPP
#define OSMIUM_MEMORY_ITEM_HPP
/*
This file is part of Osmium (http://osmcode.org/libosmium).
Copyright 2013-2016 Jochen Topf <jochen@topf.org> and others (see README).
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include <cstdint>
#include <type_traits>
namespace osmium {
// forward declaration, see osmium/osm/item_type.hpp for declaration
enum class item_type : uint16_t;
namespace builder {
class Builder;
} // namespace builder
namespace memory {
typedef uint32_t item_size_type;
// align datastructures to this many bytes
constexpr item_size_type align_bytes = 8;
template <typename T>
inline T padded_length(T length) noexcept {
return (length + align_bytes - 1) & ~(align_bytes - 1);
}
namespace detail {
class ItemHelper {
protected:
ItemHelper() = default;
~ItemHelper() = default;
ItemHelper(const ItemHelper&) = default;
ItemHelper(ItemHelper&&) = default;
ItemHelper& operator=(const ItemHelper&) = default;
ItemHelper& operator=(ItemHelper&&) = default;
public:
unsigned char* data() noexcept {
return reinterpret_cast<unsigned char*>(this);
}
const unsigned char* data() const noexcept {
return reinterpret_cast<const unsigned char*>(this);
}
}; // class ItemHelper
} // namespace detail
class Item : public osmium::memory::detail::ItemHelper {
item_size_type m_size;
item_type m_type;
uint16_t m_removed : 1;
uint16_t m_padding : 15;
template <typename TMember>
friend class CollectionIterator;
template <typename TMember>
friend class ItemIterator;
friend class osmium::builder::Builder;
Item& add_size(const item_size_type size) noexcept {
m_size += size;
return *this;
}
protected:
explicit Item(item_size_type size = 0, item_type type = item_type()) noexcept :
m_size(size),
m_type(type),
m_removed(false),
m_padding(0) {
}
Item(const Item&) = delete;
Item(Item&&) = delete;
Item& operator=(const Item&) = delete;
Item& operator=(Item&&) = delete;
Item& set_type(const item_type item_type) noexcept {
m_type = item_type;
return *this;
}
public:
unsigned char* next() noexcept {
return data() + padded_size();
}
const unsigned char* next() const noexcept {
return data() + padded_size();
}
item_size_type byte_size() const noexcept {
return m_size;
}
item_size_type padded_size() const {
return padded_length(m_size);
}
item_type type() const noexcept {
return m_type;
}
bool removed() const noexcept {
return m_removed;
}
void set_removed(bool removed) noexcept {
m_removed = removed;
}
}; // class Item
} // namespace memory
} // namespace osmium
#endif // OSMIUM_MEMORY_ITEM_HPP
osmium::memory::CollectionIterator
Definition: collection.hpp:47
osmium::osm_entity_bits::type
type
Definition: entity_bits.hpp:60
osmium::memory::Item::set_type
Item & set_type(const item_type item_type) noexcept
Definition: item.hpp:132
osmium::memory::ItemIterator
Definition: item_iterator.hpp:119
osmium::memory::Item::next
unsigned char * next() noexcept
Definition: item.hpp:139
osmium::item_type
item_type
Definition: item_type.hpp:43
osmium::memory::align_bytes
constexpr item_size_type align_bytes
Definition: item.hpp:53
osmium::memory::Item::padded_size
item_size_type padded_size() const
Definition: item.hpp:151
osmium::memory::padded_length
T padded_length(T length) noexcept
Definition: item.hpp:56
osmium::memory::Item
Definition: item.hpp:97
osmium
Namespace for everything in the Osmium library.
Definition: assembler.hpp:59
osmium::memory::Item::add_size
Item & add_size(const item_size_type size) noexcept
Definition: item.hpp:112
osmium::memory::Item::next
const unsigned char * next() const noexcept
Definition: item.hpp:143
detail
Definition: attr.hpp:298
osmium::memory::Item::m_size
item_size_type m_size
Definition: item.hpp:99
osmium::memory::Item::set_removed
void set_removed(bool removed) noexcept
Definition: item.hpp:163
osmium::memory::Item::removed
bool removed() const noexcept
Definition: item.hpp:159
osmium::memory::Item::byte_size
item_size_type byte_size() const noexcept
Definition: item.hpp:147
osmium::memory::Item::Item
Item(item_size_type size=0, item_type type=item_type()) noexcept
Definition: item.hpp:119
osmium::builder::Builder::size
uint32_t size() const noexcept
Definition: builder.hpp:123
osmium::memory::item_size_type
uint32_t item_size_type
Definition: item.hpp:50
osmium::memory::Item::m_type
item_type m_type
Definition: item.hpp:100
osmium::memory::Item::type
item_type type() const noexcept
Definition: item.hpp:155
osmium::builder::Builder
Definition: builder.hpp:57
osmium::builder::Builder::operator=
Builder & operator=(const Builder &)=delete