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visitor.hpp
Go to the documentation of this file.
#ifndef OSMIUM_VISITOR_HPP
#define OSMIUM_VISITOR_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/fwd.hpp>
#include <osmium/handler.hpp>
#include <osmium/io/reader_iterator.hpp> // IWYU pragma: keep
#include <osmium/memory/buffer.hpp>
#include <osmium/osm.hpp>
#include <osmium/osm/entity.hpp>
#include <osmium/osm/item_type.hpp>
#include <type_traits>
#include <utility>
namespace osmium {
namespace detail {
template <typename T, typename U>
using ConstIfConst = std::conditional_t<std::is_const<T>::value, std::add_const_t<U>, U>;
template <typename THandler, typename TItem>
inline void apply_item_impl(TItem& item, THandler&& handler) {
switch (item.type()) {
case osmium::item_type::undefined:
break;
case osmium::item_type::node:
std::forward<THandler>(handler).osm_object(static_cast<ConstIfConst<TItem, osmium::OSMObject>&>(item));
std::forward<THandler>(handler).node(static_cast<ConstIfConst<TItem, osmium::Node>&>(item));
break;
case osmium::item_type::way:
std::forward<THandler>(handler).osm_object(static_cast<ConstIfConst<TItem, osmium::OSMObject>&>(item));
std::forward<THandler>(handler).way(static_cast<ConstIfConst<TItem, osmium::Way>&>(item));
break;
case osmium::item_type::relation:
std::forward<THandler>(handler).osm_object(static_cast<ConstIfConst<TItem, osmium::OSMObject>&>(item));
std::forward<THandler>(handler).relation(static_cast<ConstIfConst<TItem, osmium::Relation>&>(item));
break;
case osmium::item_type::area:
std::forward<THandler>(handler).osm_object(static_cast<ConstIfConst<TItem, osmium::OSMObject>&>(item));
std::forward<THandler>(handler).area(static_cast<ConstIfConst<TItem, osmium::Area>&>(item));
break;
case osmium::item_type::changeset:
std::forward<THandler>(handler).changeset(static_cast<ConstIfConst<TItem, osmium::Changeset>&>(item));
break;
case osmium::item_type::tag_list:
std::forward<THandler>(handler).tag_list(static_cast<ConstIfConst<TItem, osmium::TagList>&>(item));
break;
case osmium::item_type::way_node_list:
std::forward<THandler>(handler).way_node_list(static_cast<ConstIfConst<TItem, osmium::WayNodeList>&>(item));
break;
case osmium::item_type::relation_member_list:
case osmium::item_type::relation_member_list_with_full_members:
std::forward<THandler>(handler).relation_member_list(static_cast<ConstIfConst<TItem, osmium::RelationMemberList>&>(item));
break;
case osmium::item_type::outer_ring:
std::forward<THandler>(handler).outer_ring(static_cast<ConstIfConst<TItem, osmium::OuterRing>&>(item));
break;
case osmium::item_type::inner_ring:
std::forward<THandler>(handler).inner_ring(static_cast<ConstIfConst<TItem, osmium::InnerRing>&>(item));
break;
case osmium::item_type::changeset_discussion:
std::forward<THandler>(handler).changeset_discussion(static_cast<ConstIfConst<TItem, osmium::ChangesetDiscussion>&>(item));
break;
}
}
template <typename THandler>
inline void apply_item_impl(const osmium::OSMEntity& item, THandler&& handler) {
switch (item.type()) {
case osmium::item_type::node:
std::forward<THandler>(handler).osm_object(static_cast<const osmium::OSMObject&>(item));
std::forward<THandler>(handler).node(static_cast<const osmium::Node&>(item));
break;
case osmium::item_type::way:
std::forward<THandler>(handler).osm_object(static_cast<const osmium::OSMObject&>(item));
std::forward<THandler>(handler).way(static_cast<const osmium::Way&>(item));
break;
case osmium::item_type::relation:
std::forward<THandler>(handler).osm_object(static_cast<const osmium::OSMObject&>(item));
std::forward<THandler>(handler).relation(static_cast<const osmium::Relation&>(item));
break;
case osmium::item_type::area:
std::forward<THandler>(handler).osm_object(static_cast<const osmium::OSMObject&>(item));
std::forward<THandler>(handler).area(static_cast<const osmium::Area&>(item));
break;
case osmium::item_type::changeset:
std::forward<THandler>(handler).changeset(static_cast<const osmium::Changeset&>(item));
break;
default:
throw osmium::unknown_type{};
}
}
template <typename THandler>
inline void apply_item_impl(osmium::OSMEntity& item, THandler&& handler) {
switch (item.type()) {
case osmium::item_type::node:
std::forward<THandler>(handler).osm_object(static_cast<osmium::OSMObject&>(item));
std::forward<THandler>(handler).node(static_cast<osmium::Node&>(item));
break;
case osmium::item_type::way:
std::forward<THandler>(handler).osm_object(static_cast<osmium::OSMObject&>(item));
std::forward<THandler>(handler).way(static_cast<osmium::Way&>(item));
break;
case osmium::item_type::relation:
std::forward<THandler>(handler).osm_object(static_cast<osmium::OSMObject&>(item));
std::forward<THandler>(handler).relation(static_cast<osmium::Relation&>(item));
break;
case osmium::item_type::area:
std::forward<THandler>(handler).osm_object(static_cast<osmium::OSMObject&>(item));
std::forward<THandler>(handler).area(static_cast<osmium::Area&>(item));
break;
case osmium::item_type::changeset:
std::forward<THandler>(handler).changeset(static_cast<osmium::Changeset&>(item));
break;
default:
throw osmium::unknown_type{};
}
}
template <typename THandler>
inline void apply_item_impl(const osmium::OSMObject& item, THandler&& handler) {
switch (item.type()) {
case osmium::item_type::node:
std::forward<THandler>(handler).osm_object(item);
std::forward<THandler>(handler).node(static_cast<const osmium::Node&>(item));
break;
case osmium::item_type::way:
std::forward<THandler>(handler).osm_object(item);
std::forward<THandler>(handler).way(static_cast<const osmium::Way&>(item));
break;
case osmium::item_type::relation:
std::forward<THandler>(handler).osm_object(item);
std::forward<THandler>(handler).relation(static_cast<const osmium::Relation&>(item));
break;
case osmium::item_type::area:
std::forward<THandler>(handler).osm_object(item);
std::forward<THandler>(handler).area(static_cast<const osmium::Area&>(item));
break;
default:
throw osmium::unknown_type{};
}
}
template <typename THandler>
inline void apply_item_impl(osmium::OSMObject& item, THandler&& handler) {
switch (item.type()) {
case osmium::item_type::node:
std::forward<THandler>(handler).osm_object(item);
std::forward<THandler>(handler).node(static_cast<osmium::Node&>(item));
break;
case osmium::item_type::way:
std::forward<THandler>(handler).osm_object(item);
std::forward<THandler>(handler).way(static_cast<osmium::Way&>(item));
break;
case osmium::item_type::relation:
std::forward<THandler>(handler).osm_object(item);
std::forward<THandler>(handler).relation(static_cast<osmium::Relation&>(item));
break;
case osmium::item_type::area:
std::forward<THandler>(handler).osm_object(item);
std::forward<THandler>(handler).area(static_cast<osmium::Area&>(item));
break;
default:
throw osmium::unknown_type{};
}
}
template <typename TFunc>
struct wrapper_handler : TFunc {
template <typename T>
explicit wrapper_handler(T&& func) : TFunc(std::forward<T>(func)) { // NOLINT(bugprone-forwarding-reference-overload)
}
// Fallback that always matches.
void operator()(const osmium::memory::Item& /*item*/) const noexcept {
}
// The function we are wrapping.
using TFunc::operator();
void osm_object(const osmium::OSMObject& /*osm_object*/) const noexcept {
}
void node(const osmium::Node& node) const {
operator()(node);
}
// cppcheck-suppress constParameter
void node(osmium::Node& node) const {
operator()(node);
}
void way(const osmium::Way& way) const {
operator()(way);
}
// cppcheck-suppress constParameter
void way(osmium::Way& way) const {
operator()(way);
}
void relation(const osmium::Relation& relation) const {
operator()(relation);
}
// cppcheck-suppress constParameter
void relation(osmium::Relation& relation) const {
operator()(relation);
}
void area(const osmium::Area& area) const {
operator()(area);
}
// cppcheck-suppress constParameter
void area(osmium::Area& area) const {
operator()(area);
}
void changeset(const osmium::Changeset& changeset) const {
operator()(changeset);
}
// cppcheck-suppress constParameter
void changeset(osmium::Changeset& changeset) const {
operator()(changeset);
}
void tag_list(const osmium::TagList& /*tag_list*/) const noexcept {
}
void way_node_list(const osmium::WayNodeList& /*way_node_list*/) const noexcept {
}
void relation_member_list(const osmium::RelationMemberList& /*relation_member_list*/) const noexcept {
}
void outer_ring(const osmium::OuterRing& /*outer_ring*/) const noexcept {
}
void inner_ring(const osmium::InnerRing& /*inner_ring*/) const noexcept {
}
void changeset_discussion(const osmium::ChangesetDiscussion& /*changeset_discussion*/) const noexcept {
}
void flush() const noexcept {
}
}; // struct wrapper_handler
// Is the class T derived from osmium::handler::Handler?
template <typename T>
using is_handler = std::is_base_of<osmium::handler::Handler, std::remove_reference_t<T>>;
// This is already a handler, use it as it is.
template <typename T, typename = std::enable_if_t<is_handler<T>::value>>
T make_handler(T&& func) {
return std::forward<T>(func);
}
// This is not a handler, but a functor. Wrap a handler around it.
template <typename T, typename = std::enable_if_t<!is_handler<T>::value>>
wrapper_handler<std::decay_t<T>> make_handler(T&& func) {
return wrapper_handler<std::decay_t<T>>(std::forward<T>(func));
}
} // namespace detail
template <typename TItem, typename... THandlers>
inline void apply_item(TItem& item, THandlers&&... handlers) {
(void)std::initializer_list<int>{
(detail::apply_item_impl(item, std::forward<THandlers>(handlers)), 0)...};
}
template <typename... THandlers>
inline void apply_flush(THandlers&&... handlers) {
(void)std::initializer_list<int>{
(std::forward<THandlers>(handlers).flush(), 0)...};
}
template <typename TIterator, typename... THandlers>
inline void apply_impl(TIterator it, TIterator end, THandlers&&... handlers) {
for (; it != end; ++it) {
apply_item(*it, handlers...);
}
apply_flush(std::forward<THandlers>(handlers)...);
}
template <typename TIterator, typename... THandlers>
inline void apply(TIterator it, TIterator end, THandlers&&... handlers) {
apply_impl(it, end, detail::make_handler<THandlers>(std::forward<THandlers>(handlers))...);
}
template <typename TContainer, typename... THandlers>
inline void apply(TContainer& c, THandlers&&... handlers) {
using std::begin;
using std::end;
apply(begin(c), end(c), std::forward<THandlers>(handlers)...);
}
template <typename... THandlers>
inline void apply(const osmium::memory::Buffer& buffer, THandlers&&... handlers) {
apply(buffer.cbegin(), buffer.cend(), std::forward<THandlers>(handlers)...);
}
} // namespace osmium
#endif // OSMIUM_VISITOR_HPP
buffer.hpp
osmium::memory::Item::type
item_type type() const noexcept
Definition item.hpp:171
entity.hpp
fwd.hpp
handler.hpp
item_type.hpp
osmium::geom::direction::forward
@ forward
Linestring has same direction as way.
Definition factory.hpp:120
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::apply_item
void apply_item(TItem &item, THandlers &&... handlers)
Definition visitor.hpp:306
osmium::apply
void apply(TIterator it, TIterator end, THandlers &&... handlers)
Definition visitor.hpp:326
osmium::apply_flush
void apply_flush(THandlers &&... handlers)
Definition visitor.hpp:312
osmium::apply_impl
void apply_impl(TIterator it, TIterator end, THandlers &&... handlers)
Definition visitor.hpp:318
osmium::item_type::tag_list
@ tag_list
Definition item_type.hpp:53
osmium::item_type::relation_member_list
@ relation_member_list
Definition item_type.hpp:55
osmium::item_type::way_node_list
@ way_node_list
Definition item_type.hpp:54
osmium::item_type::changeset_discussion
@ changeset_discussion
Definition item_type.hpp:59
osmium::item_type::relation_member_list_with_full_members
@ relation_member_list_with_full_members
Definition item_type.hpp:56
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::area
@ area
Definition item_type.hpp:51
osmium::item_type::undefined
@ undefined
Definition item_type.hpp:47
osmium::item_type::way
@ way
Definition item_type.hpp:49
osmium::item_type::outer_ring
@ outer_ring
Definition item_type.hpp:57
osmium::item_type::inner_ring
@ inner_ring
Definition item_type.hpp:58
osm.hpp
reader_iterator.hpp