Libosmium: include/osmium/diff_visitor.hpp Source File

Libosmium Fast and flexible C++ library for working with OpenStreetMap data

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diff_visitor.hpp
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1#ifndef OSMIUM_DIFF_VISITOR_HPP
2#define OSMIUM_DIFF_VISITOR_HPP
3
4/*
5
6This file is part of Osmium (https://osmcode.org/libosmium).
7
8Copyright 2013-2026 Jochen Topf <jochen@topf.org> and others (see README).
9
10Boost Software License - Version 1.0 - August 17th, 2003
11
12Permission is hereby granted, free of charge, to any person or organization
13obtaining a copy of the software and accompanying documentation covered by
14this license (the "Software") to use, reproduce, display, distribute,
15execute, and transmit the Software, and to prepare derivative works of the
16Software, and to permit third-parties to whom the Software is furnished to
17do so, all subject to the following:
18
19The copyright notices in the Software and this entire statement, including
20the above license grant, this restriction and the following disclaimer,
21must be included in all copies of the Software, in whole or in part, and
22all derivative works of the Software, unless such copies or derivative
23works are solely in the form of machine-executable object code generated by
24a source language processor.
25
26THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
27IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
28FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
29SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
30FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
31ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
32DEALINGS IN THE SOFTWARE.
33
34*/
35
36#include <osmium/diff_iterator.hpp>
37#include <osmium/io/input_iterator.hpp>
38#include <osmium/memory/buffer.hpp>
39#include <osmium/osm/diff_object.hpp>
40#include <osmium/osm/item_type.hpp>
41
42namespace osmium {
43
44 namespace detail {
45
46 template <typename THandler>
47 inline void apply_diff_iterator_recurse(const osmium::DiffObject& diff, THandler& handler) {
48 switch (diff.type()) {
49 case osmium::item_type::node:
50 handler.node(static_cast<const osmium::DiffNode&>(diff));
51 break;
52 case osmium::item_type::way:
53 handler.way(static_cast<const osmium::DiffWay&>(diff));
54 break;
55 case osmium::item_type::relation:
56 handler.relation(static_cast<const osmium::DiffRelation&>(diff));
57 break;
58 default:
59 throw osmium::unknown_type{};
60 }
61 }
62
63 template <typename THandler, typename... TRest>
64 inline void apply_diff_iterator_recurse(const osmium::DiffObject& diff, THandler& handler, TRest&... more) {
65 apply_diff_iterator_recurse(diff, handler);
66 apply_diff_iterator_recurse(diff, more...);
67 }
68
69 } // namespace detail
70
71 template <typename TIterator, typename... THandlers>
72 inline void apply_diff(TIterator it, TIterator end, THandlers&... handlers) {
73 using diff_iterator = osmium::DiffIterator<TIterator>;
74
75 diff_iterator dit{it, end};
76 diff_iterator dend{end, end};
77
78 for (; dit != dend; ++dit) {
79 detail::apply_diff_iterator_recurse(*dit, handlers...);
80 }
81 }
82
83 class OSMObject;
84
85 template <typename TSource, typename... THandlers>
86 inline void apply_diff(TSource& source, THandlers&... handlers) {
87 apply_diff(osmium::io::InputIterator<TSource, osmium::OSMObject>{source},
88 osmium::io::InputIterator<TSource, osmium::OSMObject>{},
89 handlers...);
90 }
91
92 template <typename... THandlers>
93 inline void apply_diff(osmium::memory::Buffer& buffer, THandlers&... handlers) {
94 apply_diff(buffer.begin(), buffer.end(), handlers...);
95 }
96
97 template <typename... THandlers>
98 inline void apply_diff(const osmium::memory::Buffer& buffer, THandlers&... handlers) {
99 apply_diff(buffer.cbegin(), buffer.cend(), handlers...);
100 }
101
102} // namespace osmium
103
104#endif // OSMIUM_DIFF_VISITOR_HPP
buffer.hpp
osmium::DiffIterator
Definition diff_iterator.hpp:57
osmium::DiffObject::type
osmium::item_type type() const noexcept
Definition diff_object.hpp:155
osmium::io::InputIterator
Definition input_iterator.hpp:55
diff_iterator.hpp
diff_object.hpp
input_iterator.hpp
item_type.hpp
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::DiffNode
DiffObjectDerived< osmium::Node > DiffNode
Definition diff_object.hpp:265
osmium::apply_diff
void apply_diff(TIterator it, TIterator end, THandlers &... handlers)
Definition diff_visitor.hpp:72
osmium::DiffWay
DiffObjectDerived< osmium::Way > DiffWay
Definition diff_object.hpp:266
osmium::item_type::relation
@ relation
Definition item_type.hpp:50
osmium::item_type::node
@ node
Definition item_type.hpp:48
osmium::item_type::way
@ way
Definition item_type.hpp:49
osmium::DiffRelation
DiffObjectDerived< osmium::Relation > DiffRelation
Definition diff_object.hpp:267