Libosmium: include/osmium/handler/chain.hpp Source File

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

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chain.hpp
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1#ifndef OSMIUM_HANDLER_CHAIN_HPP
2#define OSMIUM_HANDLER_CHAIN_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/handler.hpp>
37
38#include <tuple>
39
40#define OSMIUM_CHAIN_HANDLER_CALL(_func_, _type_) \
41 template <int N, int SIZE, typename THandlers> \
42 struct call_ ## _func_ { \
43 void operator()(THandlers& handlers, osmium::_type_& object) { \
44 std::get<N>(handlers)._func_(object); \
45 call_ ## _func_<N+1, SIZE, THandlers>()(handlers, object); \
46 } \
47 }; \
48 template <int SIZE, typename THandlers> \
49 struct call_ ## _func_<SIZE, SIZE, THandlers> { \
50 void operator()(THandlers&, osmium::_type_&) {} \
51 };
52
53namespace osmium {
54
55 class Node;
56 class Way;
57 class Relation;
58 class Area;
59 class Changeset;
60
61 namespace handler {
62
67 template <typename... THandler>
68 class ChainHandler : public osmium::handler::Handler {
69
70 using handlers_type = std::tuple<THandler&...>;
71 handlers_type m_handlers;
72
73 template <int N, int SIZE, typename THandlers>
74 struct call_flush {
75 void operator()(THandlers& handlers) {
76 std::get<N>(handlers).flush();
77 call_flush<N + 1, SIZE, THandlers>()(handlers);
78 }
79 }; // struct call_flush
80
81 template <int SIZE, typename THandlers>
82 struct call_flush<SIZE, SIZE, THandlers> {
83 void operator()(THandlers& /*handlers*/) {}
84 }; // struct call_flush
85
86 OSMIUM_CHAIN_HANDLER_CALL(node, Node)
87 OSMIUM_CHAIN_HANDLER_CALL(way, Way)
88 OSMIUM_CHAIN_HANDLER_CALL(relation, Relation)
89 OSMIUM_CHAIN_HANDLER_CALL(changeset, Changeset)
90 OSMIUM_CHAIN_HANDLER_CALL(area, Area)
91
92 public:
93
94 explicit ChainHandler(THandler&... handlers) :
95 m_handlers(handlers...) {
96 }
97
98 void node(osmium::Node& node) {
99 call_node<0, sizeof...(THandler), handlers_type>()(m_handlers, node);
100 }
101
102 void way(osmium::Way& way) {
103 call_way<0, sizeof...(THandler), handlers_type>()(m_handlers, way);
104 }
105
106 void relation(osmium::Relation& relation) {
107 call_relation<0, sizeof...(THandler), handlers_type>()(m_handlers, relation);
108 }
109
110 void changeset(osmium::Changeset& changeset) {
111 call_changeset<0, sizeof...(THandler), handlers_type>()(m_handlers, changeset);
112 }
113
114 void area(osmium::Area& area) {
115 call_area<0, sizeof...(THandler), handlers_type>()(m_handlers, area);
116 }
117
118 void flush() {
119 call_flush<0, sizeof...(THandler), handlers_type>()(m_handlers);
120 }
121
122 }; // class ChainHandler
123
124 } // namespace handler
125
126} // namespace osmium
127
128#endif // OSMIUM_HANDLER_CHAIN_HPP
OSMIUM_CHAIN_HANDLER_CALL
#define OSMIUM_CHAIN_HANDLER_CALL(_func_, _type_)
Definition chain.hpp:40
osmium::Area
Definition area.hpp:125
osmium::Changeset
An OSM Changeset, a group of changes made by a single user over a short period of time.
Definition changeset.hpp:146
osmium::Node
Definition node.hpp:48
osmium::Relation
Definition relation.hpp:161
osmium::Way
Definition way.hpp:72
osmium::handler::ChainHandler::relation
void relation(osmium::Relation &relation)
Definition chain.hpp:106
osmium::handler::ChainHandler::way
void way(osmium::Way &way)
Definition chain.hpp:102
osmium::handler::ChainHandler::changeset
void changeset(osmium::Changeset &changeset)
Definition chain.hpp:110
osmium::handler::ChainHandler::ChainHandler
ChainHandler(THandler &... handlers)
Definition chain.hpp:94
osmium::handler::ChainHandler::node
void node(osmium::Node &node)
Definition chain.hpp:98
osmium::handler::ChainHandler::m_handlers
handlers_type m_handlers
Definition chain.hpp:71
osmium::handler::ChainHandler::handlers_type
std::tuple< THandler &... > handlers_type
Definition chain.hpp:70
osmium::handler::ChainHandler::area
void area(osmium::Area &area)
Definition chain.hpp:114
osmium::handler::ChainHandler::flush
void flush()
Definition chain.hpp:118
osmium::handler::Handler
Definition handler.hpp:71
handler.hpp
osmium::area
Code related to the building of areas (multipolygons) from relations.
Definition assembler.hpp:55
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::item_type::relation
@ relation
Definition item_type.hpp:50
osmium::item_type::node
@ node
Definition item_type.hpp:48
osmium::item_type::changeset
@ changeset
Definition item_type.hpp:52
osmium::item_type::way
@ way
Definition item_type.hpp:49
osmium::handler::ChainHandler::call_flush< SIZE, SIZE, THandlers >::operator()
void operator()(THandlers &)
Definition chain.hpp:83
osmium::handler::ChainHandler::call_flush
Definition chain.hpp:74
osmium::handler::ChainHandler::call_flush::operator()
void operator()(THandlers &handlers)
Definition chain.hpp:75