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chain.hpp
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#ifndef OSMIUM_HANDLER_CHAIN_HPP
#define OSMIUM_HANDLER_CHAIN_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 <osmium/handler.hpp>
#include <tuple>
#define OSMIUM_CHAIN_HANDLER_CALL(_func_, _type_) \
template <int N, int SIZE, typename THandlers> \
struct call_ ## _func_ { \
void operator()(THandlers& handlers, osmium::_type_& object) { \
std::get<N>(handlers)._func_(object); \
call_ ## _func_<N+1, SIZE, THandlers>()(handlers, object); \
} \
}; \
template <int SIZE, typename THandlers> \
struct call_ ## _func_<SIZE, SIZE, THandlers> { \
void operator()(THandlers&, osmium::_type_&) {} \
};
namespace osmium {
class Node;
class Way;
class Relation;
class Area;
class Changeset;
namespace handler {
template <typename... THandler>
class ChainHandler : public osmium::handler::Handler {
using handlers_type = std::tuple<THandler&...>;
handlers_type m_handlers;
template <int N, int SIZE, typename THandlers>
struct call_flush {
void operator()(THandlers& handlers) {
std::get<N>(handlers).flush();
call_flush<N + 1, SIZE, THandlers>()(handlers);
}
}; // struct call_flush
template <int SIZE, typename THandlers>
struct call_flush<SIZE, SIZE, THandlers> {
void operator()(THandlers& /*handlers*/) {}
}; // struct call_flush
OSMIUM_CHAIN_HANDLER_CALL(node, Node)
OSMIUM_CHAIN_HANDLER_CALL(way, Way)
OSMIUM_CHAIN_HANDLER_CALL(relation, Relation)
OSMIUM_CHAIN_HANDLER_CALL(changeset, Changeset)
OSMIUM_CHAIN_HANDLER_CALL(area, Area)
public:
explicit ChainHandler(THandler&... handlers) :
m_handlers(handlers...) {
}
void node(osmium::Node& node) {
call_node<0, sizeof...(THandler), handlers_type>()(m_handlers, node);
}
void way(osmium::Way& way) {
call_way<0, sizeof...(THandler), handlers_type>()(m_handlers, way);
}
void relation(osmium::Relation& relation) {
call_relation<0, sizeof...(THandler), handlers_type>()(m_handlers, relation);
}
void changeset(osmium::Changeset& changeset) {
call_changeset<0, sizeof...(THandler), handlers_type>()(m_handlers, changeset);
}
void area(osmium::Area& area) {
call_area<0, sizeof...(THandler), handlers_type>()(m_handlers, area);
}
void flush() {
call_flush<0, sizeof...(THandler), handlers_type>()(m_handlers);
}
}; // class ChainHandler
} // namespace handler
} // namespace osmium
#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