Hashmap.h

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// The MIT License (MIT)
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#include "open3d/core/Dtype.h"
#include "open3d/core/Tensor.h"
#include "open3d/core/hashmap/DeviceHashmap.h"
#include "open3d/core/hashmap/Traits.h"

namespace open3d {
namespace core {

class Hashmap {
public:
    static constexpr uint32_t kDefaultElemsPerBucket = 4;

    // Default constructor for common users.
    Hashmap(size_t init_capacity,
            Dtype dtype_key,
            Dtype dtype_val,
            const Device& device);

    ~Hashmap(){};

    void Rehash(size_t buckets);

    void Insert(const void* input_keys,
                const void* input_values,
                iterator_t* output_iterators,
                bool* output_masks,
                size_t count);

    void Insert(const Tensor& input_keys,
                const Tensor& input_values,
                Tensor& output_iterators,
                Tensor& output_masks);

    void Activate(const void* input_keys,
                  iterator_t* output_iterators,
                  bool* output_masks,
                  size_t count);

    void Activate(const Tensor& input_keys,
                  Tensor& output_iterators,
                  Tensor& output_masks);

    void Find(const void* input_keys,
              iterator_t* output_iterators,
              bool* output_masks,
              size_t count);

    void Find(const Tensor& input_keys,
              Tensor& output_iterators,
              Tensor& output_masks);

    void Erase(const void* input_keys, bool* output_masks, size_t count);

    void Erase(const Tensor& input_keys, Tensor& output_masks);

    size_t GetIterators(iterator_t* output_iterators);

    void UnpackIterators(const iterator_t* input_iterators,
                         const bool* input_masks,
                         void* output_keys,
                         void* output_values,
                         size_t count);

    void AssignIterators(iterator_t* input_iterators,
                         const bool* input_masks,
                         const void* input_values,
                         size_t count);

    size_t Size() const;

    std::vector<size_t> BucketSizes() const;

    float LoadFactor() const;

    void AssertKeyDtype(const Dtype& dtype_key) const;
    void AssertValueDtype(const Dtype& dtype_val) const;

    Dtype GetKeyDtype() const { return dtype_key_; }
    Dtype GetValueDtype() const { return dtype_val_; }

    Device GetDevice() const { return device_hashmap_->GetDevice(); }

private:
    std::shared_ptr<DefaultDeviceHashmap> device_hashmap_;

    Dtype dtype_key_ = Dtype::Undefined;
    Dtype dtype_val_ = Dtype::Undefined;
};

}  // namespace core
}  // namespace open3d