TensorMap.h

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#pragma once

#include <string>
#include <unordered_map>

#include "open3d/core/Tensor.h"

namespace open3d {
namespace t {
namespace geometry {

class TensorMap : public std::unordered_map<std::string, core::Tensor> {
public:
    explicit TensorMap(const std::string& primary_key)
        : std::unordered_map<std::string, core::Tensor>(),
          primary_key_(primary_key) {}

    explicit TensorMap() : TensorMap("Undefined") {
        utility::LogError("Please construct TensorMap with a primary key.");
    }

    template <class InputIt>
    TensorMap(const std::string& primary_key, InputIt first, InputIt last)
        : std::unordered_map<std::string, core::Tensor>(first, last),
          primary_key_(primary_key) {
        AssertPrimaryKeyInMapOrEmpty();
    }

    TensorMap(const std::string& primary_key,
              const std::unordered_map<std::string, core::Tensor>& tensor_map)
        : TensorMap(primary_key, tensor_map.begin(), tensor_map.end()) {}

    TensorMap(const std::string& primary_key,
              std::initializer_list<value_type> init)
        : std::unordered_map<std::string, core::Tensor>(init),
          primary_key_(primary_key) {
        AssertPrimaryKeyInMapOrEmpty();
    }

    TensorMap(const TensorMap& other)
        : std::unordered_map<std::string, core::Tensor>(other),
          primary_key_(other.primary_key_) {
        AssertPrimaryKeyInMapOrEmpty();
    }

    TensorMap(TensorMap&& other)
        : std::unordered_map<std::string, core::Tensor>(other),
          primary_key_(other.primary_key_) {
        AssertPrimaryKeyInMapOrEmpty();
    }

    TensorMap& operator=(const TensorMap&) = default;

    TensorMap& operator=(TensorMap&&) = default;

    std::string GetPrimaryKey() const { return primary_key_; }

    bool IsSizeSynchronized() const;

    void AssertSizeSynchronized() const;

    bool Contains(const std::string& key) const { return count(key) != 0; }

private:
    void AssertPrimaryKeyInMapOrEmpty() const;

    int64_t GetPrimarySize() const { return at(primary_key_).GetLength(); }

    core::Device GetPrimaryDevice() const {
        return at(primary_key_).GetDevice();
    }

    std::string primary_key_;
};

}  // namespace geometry
}  // namespace t
}  // namespace open3d