TheRock/rocm-libraries/projects/hipsparselt/clients/include/device_vector.hpp

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 *
 * MIT License
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 * Copyright (c) 2022 Advanced Micro Devices, Inc.
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#pragma once

#include "d_vector.hpp"

//
// Local declaration of the host vector.
//
template <typename T>
class host_vector;

//!
//! @brief pseudo-vector subclass which uses device memory
//!
template <typename T>
class device_vector : public d_vector<T>
{

public:
    //!
    //! @brief Disallow copying.
    //!
    device_vector(const device_vector&) = delete;

    //!
    //! @brief Disallow assigning
    //!
    device_vector& operator=(const device_vector&) = delete;

    //!
    //! @brief Constructor.
    //! @param n The length of the vector.
    //! @param inc The increment.
    //! @param HMM         HipManagedMemory Flag.
    //!
    explicit device_vector(size_t n, int64_t inc = 1, bool HMM = false)
        : d_vector<T>{n * std::abs(inc), HMM}
        , m_n{n}
        , m_inc{inc}
        , m_data{this->device_vector_setup()}
    {
    }

    //!
    //! @brief Destructor.
    //!
    ~device_vector()
    {
        this->device_vector_teardown(m_data);
        m_data = nullptr;
    }

    //!
    //! @brief Returns the length of the vector.
    //!
    size_t n() const
    {
        return m_n;
    }

    //!
    //! @brief Returns the increment of the vector.
    //!
    int64_t inc() const
    {
        return m_inc;
    }

    //!
    //! @brief Returns the batch count (always 1).
    //!
    int64_t batch_count() const
    {
        return 1;
    }

    //!
    //! @brief Returns the stride (out of context, always 0)
    //!
    int64_t stride() const
    {
        return 0;
    }

    //!
    //! @brief Decay into pointer wherever pointer is expected.
    //!
    operator T*()
    {
        return m_data;
    }

    //!
    //! @brief Decay into constant pointer wherever pointer is expected.
    //!
    operator const T*() const
    {
        return m_data;
    }

    //!
    //! @brief Transfer data from a host vector.
    //! @param that The host vector.
    //! @return the hip error.
    //!
    hipError_t transfer_from(const host_vector<T>& that)
    {
        return hipMemcpy(m_data,
                         (const T*)that,
                         this->nmemb() * sizeof(T),
                         this->use_HMM ? hipMemcpyHostToHost : hipMemcpyHostToDevice);
    }

    hipError_t memcheck() const
    {
        return !this->nmemb() || m_data ? hipSuccess : hipErrorOutOfMemory;
    }

private:
    size_t  m_n{};
    int64_t m_inc{};
    T*      m_data{};
};