179 lines
6.4 KiB
C++
179 lines
6.4 KiB
C++
#ifndef OSMIUM_OSM_OBJECT_COMPARISONS_HPP
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#define OSMIUM_OSM_OBJECT_COMPARISONS_HPP
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/*
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This file is part of Osmium (https://osmcode.org/libosmium).
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Copyright 2013-2022 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 <osmium/osm/object.hpp>
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#include <osmium/osm/timestamp.hpp>
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#include <osmium/util/misc.hpp>
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#include <cassert>
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#include <cstdlib>
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#include <tuple>
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namespace osmium {
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/**
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* Function object class for comparing OSM objects for equality by type,
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* ID, and version.
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*/
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struct object_equal_type_id_version {
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bool operator()(const osmium::OSMObject& lhs, const osmium::OSMObject& rhs) const noexcept {
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return lhs == rhs;
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}
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/// @pre lhs and rhs must not be nullptr
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bool operator()(const osmium::OSMObject* lhs, const osmium::OSMObject* rhs) const noexcept {
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assert(lhs && rhs);
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return *lhs == *rhs;
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}
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}; // struct object_equal_type_id_version
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/**
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* Function object class for comparing OSM objects for equality by type
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* and ID, ignoring the version.
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*/
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struct object_equal_type_id {
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bool operator()(const osmium::OSMObject& lhs, const osmium::OSMObject& rhs) const noexcept {
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return lhs.type() == rhs.type() &&
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lhs.id() == rhs.id();
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}
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/// @pre lhs and rhs must not be nullptr
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bool operator()(const osmium::OSMObject* lhs, const osmium::OSMObject* rhs) const noexcept {
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assert(lhs && rhs);
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return operator()(*lhs, *rhs);
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}
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}; // struct object_equal_type_id
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/**
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* Compare two objects IDs. Order is as follows: 0 first, then negative
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* IDs, then positive IDs, both ordered by their absolute values.
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*/
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struct id_order {
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bool operator()(const object_id_type lhs, const object_id_type rhs) const noexcept {
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if (rhs == 0) {
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return false;
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}
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if (lhs == 0) {
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return true;
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}
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if (lhs < 0) {
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if (rhs > 0) {
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return true;
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}
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// rhs < 0
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return lhs > rhs;
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}
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// lhs > 0
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if (rhs < 0) {
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return false;
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}
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return lhs < rhs;
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}
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}; // struct id_order
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/**
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* Function object class for ordering OSM objects by type, id, version,
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* and timestamp.
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*/
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struct object_order_type_id_version {
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bool operator()(const osmium::OSMObject& lhs, const osmium::OSMObject& rhs) const noexcept {
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return lhs < rhs;
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}
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/// @pre lhs and rhs must not be nullptr
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bool operator()(const osmium::OSMObject* lhs, const osmium::OSMObject* rhs) const noexcept {
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assert(lhs && rhs);
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return *lhs < *rhs;
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}
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}; // struct object_order_type_id_version
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/**
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* Function object class for ordering OSM objects by type, id, and version.
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*
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* The naming is a bit awkward here, but necessary to keep backwards
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* compatibility with object_order_type_id_version.
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*/
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struct object_order_type_id_version_without_timestamp {
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bool operator()(const osmium::OSMObject& lhs, const osmium::OSMObject& rhs) const noexcept {
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return const_tie(lhs.type(), lhs.id() > 0, lhs.positive_id(), lhs.version()) <
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const_tie(rhs.type(), rhs.id() > 0, rhs.positive_id(), rhs.version());
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}
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/// @pre lhs and rhs must not be nullptr
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bool operator()(const osmium::OSMObject* lhs, const osmium::OSMObject* rhs) const noexcept {
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assert(lhs && rhs);
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return operator()(*lhs, *rhs);
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}
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}; // struct object_order_type_id_version_without_timestamp
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/**
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* Function object class for ordering OSM objects by type, ID, and
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* reverse version, timestamp. So objects are ordered by type and ID
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* (negative IDs first, then positive IDs, both in the order of their
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* absolute values), but later versions of an object are ordered before
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* earlier versions of the same object. This is useful when the last
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* version of an object needs to be used.
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*/
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struct object_order_type_id_reverse_version {
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bool operator()(const osmium::OSMObject& lhs, const osmium::OSMObject& rhs) const noexcept {
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return const_tie(lhs.type(), lhs.id() > 0, lhs.positive_id(), rhs.version(),
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((lhs.timestamp().valid() && rhs.timestamp().valid()) ? rhs.timestamp() : osmium::Timestamp())) <
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const_tie(rhs.type(), rhs.id() > 0, rhs.positive_id(), lhs.version(),
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((lhs.timestamp().valid() && rhs.timestamp().valid()) ? lhs.timestamp() : osmium::Timestamp()));
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}
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/// @pre lhs and rhs must not be nullptr
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bool operator()(const osmium::OSMObject* lhs, const osmium::OSMObject* rhs) const noexcept {
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assert(lhs && rhs);
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return operator()(*lhs, *rhs);
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}
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}; // struct object_order_type_id_reverse_version
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} // namespace osmium
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#endif // OSMIUM_OSM_OBJECT_COMPARISONS_HPP
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