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item.hpp
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#ifndef OSMIUM_MEMORY_ITEM_HPP
#define OSMIUM_MEMORY_ITEM_HPP
/*
This file is part of Osmium (https://osmcode.org/libosmium).
Copyright 2013-2026 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 <cstddef>
#include <cstdint>
namespace osmium {
// forward declaration, see osmium/osm/item_type.hpp for declaration
enum class item_type : uint16_t;
namespace builder {
class Builder;
} // namespace builder
enum class diff_indicator_type {
none = 0,
left = 1,
right = 2,
both = 3
}; // diff_indicator_type
namespace memory {
using item_size_type = uint32_t;
// align datastructures to this many bytes
enum : std::size_t {
align_bytes = 8UL
};
constexpr std::size_t padded_length(std::size_t length) noexcept {
return (length + align_bytes - 1) & ~(align_bytes - 1);
}
namespace detail {
class ItemHelper {
protected:
ItemHelper() noexcept = default;
ItemHelper(const ItemHelper&) noexcept = default;
ItemHelper(ItemHelper&&) noexcept = default;
ItemHelper& operator=(const ItemHelper&) noexcept = default;
ItemHelper& operator=(ItemHelper&&) noexcept = default;
~ItemHelper() noexcept = 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_diff : 2;
uint16_t m_padding : 13;
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_diff(0),
m_padding(0) {
}
Item& set_type(const item_type item_type) noexcept {
m_type = item_type;
return *this;
}
public:
Item(const Item&) = delete;
Item& operator=(const Item&) = delete;
Item(Item&&) = delete;
Item& operator=(Item&&) = delete;
~Item() noexcept = default;
constexpr static bool is_compatible_to(osmium::item_type /*t*/) noexcept {
return true;
}
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 static_cast<item_size_type>(padded_length(m_size));
}
item_type type() const noexcept {
return m_type;
}
bool removed() const noexcept {
return m_removed;
}
void set_removed(const bool removed) noexcept {
m_removed = removed;
}
diff_indicator_type diff() const noexcept {
return static_cast<diff_indicator_type>(m_diff);
}
char diff_as_char() const noexcept {
static constexpr const char* diff_chars = "*-+ ";
return diff_chars[m_diff];
}
void set_diff(const diff_indicator_type diff) noexcept {
m_diff = static_cast<uint16_t>(diff);
}
}; // class Item
} // namespace memory
} // namespace osmium
#endif // OSMIUM_MEMORY_ITEM_HPP
osmium::builder::Builder
Definition builder.hpp:56
osmium::memory::Item::diff_as_char
char diff_as_char() const noexcept
Definition item.hpp:187
osmium::memory::Item::set_type
Item & set_type(const item_type item_type) noexcept
Definition item.hpp:136
osmium::memory::Item::type
item_type type() const noexcept
Definition item.hpp:171
osmium::memory::Item::is_compatible_to
static constexpr bool is_compatible_to(osmium::item_type) noexcept
Definition item.hpp:151
osmium::memory::Item::m_diff
uint16_t m_diff
Definition item.hpp:110
osmium::memory::Item::m_size
item_size_type m_size
Definition item.hpp:107
osmium::memory::Item::Item
Item(Item &&)=delete
osmium::memory::Item::Item
Item(const Item &)=delete
osmium::memory::Item::diff
diff_indicator_type diff() const noexcept
Definition item.hpp:183
osmium::memory::Item::m_removed
uint16_t m_removed
Definition item.hpp:109
osmium::memory::Item::removed
bool removed() const noexcept
Definition item.hpp:175
osmium::memory::Item::~Item
~Item() noexcept=default
osmium::memory::Item::set_removed
void set_removed(const bool removed) noexcept
Definition item.hpp:179
osmium::memory::Item::Item
Item(item_size_type size=0, item_type type=item_type{}) noexcept
Definition item.hpp:128
osmium::memory::Item::byte_size
item_size_type byte_size() const noexcept
Definition item.hpp:163
osmium::memory::Item::operator=
Item & operator=(Item &&)=delete
osmium::memory::Item::operator=
Item & operator=(const Item &)=delete
osmium::memory::Item::next
const unsigned char * next() const noexcept
Definition item.hpp:159
osmium::memory::Item::add_size
Item & add_size(const item_size_type size) noexcept
Definition item.hpp:121
osmium::memory::Item::next
unsigned char * next() noexcept
Definition item.hpp:155
osmium::memory::Item::set_diff
void set_diff(const diff_indicator_type diff) noexcept
Definition item.hpp:192
osmium::memory::Item::ItemIterator
friend class ItemIterator
Definition item.hpp:117
osmium::memory::Item::m_padding
uint16_t m_padding
Definition item.hpp:111
osmium::memory::Item::m_type
item_type m_type
Definition item.hpp:108
osmium::memory::Item::CollectionIterator
friend class CollectionIterator
Definition item.hpp:114
osmium::memory::Item::padded_size
item_size_type padded_size() const
Definition item.hpp:167
detail
Definition attr.hpp:342
osmium::builder
Classes for building OSM objects and other items in buffers.
Definition attr.hpp:62
osmium::memory::padded_length
constexpr std::size_t padded_length(std::size_t length) noexcept
Definition item.hpp:64
osmium::memory::align_bytes
@ align_bytes
Definition item.hpp:61
osmium::memory::item_size_type
uint32_t item_size_type
Definition item.hpp:57
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::diff_indicator_type
diff_indicator_type
Definition item.hpp:48
osmium::diff_indicator_type::none
@ none
Definition item.hpp:49
osmium::diff_indicator_type::right
@ right
Definition item.hpp:51
osmium::diff_indicator_type::left
@ left
Definition item.hpp:50
osmium::diff_indicator_type::both
@ both
Definition item.hpp:52
osmium::item_type
item_type
Definition item_type.hpp:45