114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
#pragma once
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#include <mapbox/geometry.hpp>
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#include <mapbox/variant.hpp>
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#include <cstdint>
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#include <string>
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#include <vector>
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#include <unordered_map>
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namespace mapbox {
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namespace feature {
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struct value;
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struct null_value_t
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{
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};
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constexpr bool operator==(const null_value_t&, const null_value_t&) { return true; }
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constexpr bool operator!=(const null_value_t&, const null_value_t&) { return false; }
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constexpr bool operator<(const null_value_t&, const null_value_t&) { return false; }
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constexpr null_value_t null_value = null_value_t();
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// Multiple numeric types (uint64_t, int64_t, double) are present in order to support
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// the widest possible range of JSON numbers, which do not have a maximum range.
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// Implementations that produce `value`s should use that order for type preference,
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// using uint64_t for positive integers, int64_t for negative integers, and double
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// for non-integers and integers outside the range of 64 bits.
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using value_base = mapbox::util::variant<null_value_t, bool, uint64_t, int64_t, double, std::string,
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mapbox::util::recursive_wrapper<std::vector<value>>,
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mapbox::util::recursive_wrapper<std::unordered_map<std::string, value>>>;
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struct value : value_base
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{
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using value_base::value_base;
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};
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using property_map = std::unordered_map<std::string, value>;
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// The same considerations and requirement for numeric types apply as for `value_base`.
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using identifier = mapbox::util::variant<null_value_t, uint64_t, int64_t, double, std::string>;
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template <class T>
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struct feature
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{
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using coordinate_type = T;
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using geometry_type = mapbox::geometry::geometry<T>; // Fully qualified to avoid GCC -fpermissive error.
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geometry_type geometry;
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property_map properties;
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identifier id;
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feature()
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: geometry(),
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properties(),
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id() {}
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feature(geometry_type const& geom_)
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: geometry(geom_),
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properties(),
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id() {}
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feature(geometry_type&& geom_)
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: geometry(std::move(geom_)),
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properties(),
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id() {}
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feature(geometry_type const& geom_, property_map const& prop_)
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: geometry(geom_), properties(prop_), id() {}
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feature(geometry_type&& geom_, property_map&& prop_)
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: geometry(std::move(geom_)),
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properties(std::move(prop_)),
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id() {}
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feature(geometry_type const& geom_, property_map const& prop_, identifier const& id_)
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: geometry(geom_),
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properties(prop_),
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id(id_) {}
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feature(geometry_type&& geom_, property_map&& prop_, identifier&& id_)
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: geometry(std::move(geom_)),
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properties(std::move(prop_)),
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id(std::move(id_)) {}
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};
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template <class T>
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constexpr bool operator==(feature<T> const& lhs, feature<T> const& rhs)
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{
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return lhs.id == rhs.id && lhs.geometry == rhs.geometry && lhs.properties == rhs.properties;
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}
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template <class T>
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constexpr bool operator!=(feature<T> const& lhs, feature<T> const& rhs)
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{
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return !(lhs == rhs);
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}
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template <class T, template <typename...> class Cont = std::vector>
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struct feature_collection : Cont<feature<T>>
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{
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using coordinate_type = T;
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using feature_type = feature<T>;
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using container_type = Cont<feature_type>;
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using size_type = typename container_type::size_type;
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template <class... Args>
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feature_collection(Args&&... args) : container_type(std::forward<Args>(args)...)
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{
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}
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feature_collection(std::initializer_list<feature_type> args)
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: container_type(std::move(args)) {}
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};
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} // namespace feature
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} // namespace mapbox
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