cpp-mathmatic-matrix/include/math/matrix/row_reference.hpp

#pragma once

#include <cstdlib>
#include <stdexcept>

#include <expect/expect.hpp>
#include <math/vector/vector.hpp>

#include "math/matrix/macro.h"

namespace math::matrix {
template <typename T, size_t C> class row_reference {
private:
  row_reference(T (&h)[C]) : _handle(h) {}

public:
  row_reference(row_reference const &) = delete;
  row_reference(row_reference &&) = default;

  template <typename S>
  row_reference & operator=(row_reference<S, C> const & other) {
    VECTOR_FOR_EACH_RANGE(i, C) { _handle[i] = other[i]; }
    return *this;
  }

  T const & operator[](size_t col) const { return _handle[col]; }
  T & operator[](size_t col) { return _handle[col]; }
  T const & at(size_t col) const {
    expects(col < C, std::out_of_range, "column index out of range");
    return operator[](col);
  }
  T & at(size_t col) {
    expects(col < C, std::out_of_range, "column index out of range");
    return operator[](col);
  }

private:
  template <typename _T, size_t R, size_t _C> friend class matrix;
  T (&_handle)[C];
};
}

#include "math/matrix/undef.h"