lab-rv32i-freertos-vector-raii/include/freertos/vector_v1.hpp

#ifndef FREERTOS_CPP_VECTOR_V1_HPP
#define FREERTOS_CPP_VECTOR_V1_HPP

#include <stddef.h>

namespace freertos
{

/*
 * VectorV1 deliberately owns exactly one allocation.  It is small enough to
 * expose the Rule of Five without hiding the transfer behind a hosted STL
 * container.  Bounds checking and growth belong to later container lessons.
 */
class VectorV1 final
{
public:
    explicit VectorV1( size_t size )
        : elements_ { size != 0U ? new double[ size ] : nullptr },
          size_ { size }
    {
    }

    ~VectorV1() noexcept
    {
        release();
    }

    VectorV1( const VectorV1 & ) = delete;
    VectorV1 & operator=( const VectorV1 & ) = delete;

    VectorV1( VectorV1 && other ) noexcept
        : elements_ { other.elements_ }, size_ { other.size_ }
    {
        other.elements_ = nullptr;
        other.size_ = 0U;
    }

    VectorV1 & operator=( VectorV1 && other ) noexcept
    {
        if( this != &other )
        {
            /* Release the old destination before taking the source buffer. */
            release();
            elements_ = other.elements_;
            size_ = other.size_;
            other.elements_ = nullptr;
            other.size_ = 0U;
        }
        return *this;
    }

    double & operator[]( size_t index ) noexcept
    {
        return elements_[ index ];
    }

    const double & operator[]( size_t index ) const noexcept
    {
        return elements_[ index ];
    }

    double * data() noexcept
    {
        return elements_;
    }

    const double * data() const noexcept
    {
        return elements_;
    }

    size_t size() const noexcept
    {
        return size_;
    }

    bool empty() const noexcept
    {
        return size_ == 0U;
    }

private:
    void release() noexcept
    {
        delete[] elements_;
        elements_ = nullptr;
        size_ = 0U;
    }

    double * elements_;
    size_t size_;
};

} // namespace freertos

#endif