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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef _CATEGORY_HANDLER_H
#define _CATEGORY_HANDLER_H
#include <string>
#include <vector>
#include "System/UnorderedMap.hpp"
#include "System/Misc/NonCopyable.h"
#include "System/creg/creg_cond.h"
class CCategoryHandler : public spring::noncopyable
{
CR_DECLARE_STRUCT(CCategoryHandler)
public:
// categories work as bitfields, so
// we can not support more than this
static constexpr inline unsigned int GetMaxCategories() { return (sizeof(unsigned int) * 8); }
static CCategoryHandler* Instance();
static void CreateInstance();
static void RemoveInstance();
void Init() { categories.reserve(GetMaxCategories()); firstUnused = 0; }
void Kill() { categories.clear(); }
/**
* Returns the categories bit-field value.
* @return the categories bit-field value or 0,
* in case of empty name or too many categories
*/
unsigned int GetCategory(std::string name);
/**
* Returns the bit-field values of a list of category names.
* @see GetCategory(std::string name)
*/
unsigned int GetCategories(std::string names);
/**
* Returns a list of names of all categories described by the bit-field.
* @see GetCategory(std::string name)
*/
std::vector<std::string> GetCategoryNames(unsigned int bits) const;
private:
// iterated in GetCategoryNames; reserved size must be constant
spring::unordered_map<std::string, unsigned int> categories;
unsigned int firstUnused = 0;
};
#endif // _CATEGORY_HANDLER_H
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