SizeVector.h

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#pragma once

#include <cstddef>
#include <numeric>
#include <string>
#include <vector>

#include "open3d/utility/Console.h"

namespace open3d {
namespace core {

class SizeVector : public std::vector<int64_t> {
public:
    SizeVector(const std::initializer_list<int64_t>& dim_sizes)
        : std::vector<int64_t>(dim_sizes) {}

    SizeVector(const std::vector<int64_t>& dim_sizes)
        : std::vector<int64_t>(dim_sizes) {}

    SizeVector(const SizeVector& other) : std::vector<int64_t>(other) {}

    explicit SizeVector(int64_t n, int64_t initial_value = 0)
        : std::vector<int64_t>(n, initial_value) {}

    template <class InputIterator>
    SizeVector(InputIterator first, InputIterator last)
        : std::vector<int64_t>(first, last) {}

    SizeVector() {}

    SizeVector& operator=(const SizeVector& v) {
        static_cast<std::vector<int64_t>*>(this)->operator=(v);
        return *this;
    }

    SizeVector& operator=(SizeVector&& v) {
        static_cast<std::vector<int64_t>*>(this)->operator=(v);
        return *this;
    }

    int64_t NumElements() const {
        if (this->size() == 0) {
            return 1;
        }
        return std::accumulate(
                this->begin(), this->end(), 1LL,
                [this](const int64_t& lhs, const int64_t& rhs) -> int64_t {
                    if (lhs < 0 || rhs < 0) {
                        utility::LogError(
                                "Shape {} cannot contain negative dimensions.",
                                this->ToString());
                    }
                    return std::multiplies<int64_t>()(lhs, rhs);
                });
    }

    std::string ToString() const { return fmt::format("{}", *this); }
};

}  // namespace core
}  // namespace open3d