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#pragma once
#include <cstdint>
#include <string>
#include <unordered_map>
#include <functional>
namespace mbgl {
namespace style {
enum class ClassID : uint32_t {
Default = 1, // These values are from the default style for a layer
Named = 2 // These values (and all subsequent IDs) are from a named style from the layer
};
class ClassDictionary {
private:
ClassDictionary();
public:
static ClassDictionary &Get();
// Returns an ID for a class name. If the class name does not yet have an ID, one is
// auto-generated and stored for future reference.
ClassID lookup(const std::string &class_name);
// Returns either Fallback, Default or Named, depending on the type of the class id.
ClassID normalize(ClassID id);
private:
std::unordered_map<std::string, ClassID> store = { { "", ClassID::Default } };
uint32_t offset = 0;
};
} // namespace style
} // namespace mbgl
namespace std {
// Explicitly define std::hash<style::ClassID> because GCC doesn't automatically use std::hash<> of
// the underlying enum type.
template <>
struct hash<mbgl::style::ClassID> {
public:
size_t operator()(const mbgl::style::ClassID id) const {
using T = std::underlying_type_t<mbgl::style::ClassID>;
return std::hash<T>()(static_cast<T>(id));
}
};
} // namespace std
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