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#ifndef GRID_CACHE_H_67BBE74D
#define GRID_CACHE_H_67BBE74D
#include <unordered_map>
#include <unordered_set>
#include "level.h"
template <typename T>
class GridCache {
public:
explicit GridCache(const Level& level) : width_(level.getSize().w())
{
}
void set(T value, vec2s pos)
{
if (reverse_.count(value))
{
size_t oldPosIndex = reverse_.at(value);
lookup_[oldPosIndex].erase(value);
}
size_t newPosIndex = getIndex(pos);
lookup_[newPosIndex].insert(value);
reverse_[value] = newPosIndex;
}
void remove(T value)
{
if (reverse_.count(value))
{
size_t index = reverse_.at(value);
lookup_[index].erase(value);
reverse_.erase(value);
}
}
const std::unordered_set<T>& at(vec2s pos) const
{
size_t index = getIndex(pos);
return lookup_[index];
}
private:
inline size_t getIndex(const vec2s& pos) const
{
return pos.x() + pos.y() * width_;
}
size_t width_;
mutable std::unordered_map<size_t, std::unordered_set<T>> lookup_;
std::unordered_map<T, size_t> reverse_;
};
#endif /* end of include guard: GRID_CACHE_H_67BBE74D */
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