Three Dimensional Array in C++

 A simple program to demonstrate how to declare and use three dimensional arrays in C++ programming language.

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Program Listing

#include <iostream>

#include <vector>

#include <cassert>

template<class T>

class Array3D

{

  std::vector<T> data;

  size_t m_dim1, m_dim2, m_dim3;

public:

  Array3D(size_t dim1, size_t dim2, size_t dim3):

    m_dim1(dim1), m_dim2(dim2), m_dim3(dim3)

  {

    assert(m_dim1 > 1 && m_dim2 > 1 && m_dim3 > 1);

    data.resize(m_dim1 * m_dim2 * m_dim3);

  }

  T& operator()(size_t d1, size_t d2, size_t d3)

  {

    assert(d1 < m_dim1 && d2 < m_dim2 && d3 < m_dim3);

    return data[d1*d2*m_dim3 + d2*m_dim3 + d3];

  }

  const T& operator()(size_t d1, size_t d2, size_t d3) const

  {

    assert(d1 < m_dim1 && d2 < m_dim2 && d3 < m_dim3);

    return data[d1*d2*m_dim3 + d2*m_dim3 + d3];

  }

  size_t dim1() {return m_dim1;}

  size_t dim2() {return m_dim2;}

  size_t dim3() {return m_dim3;}

};

int main()

{

  Array3D<int> array3d(2,2,2);

  for ( size_t d1=0; d1 < 2; ++d1 )

  {

    for ( size_t d2=0; d2 < 2; ++d2 )

    {

      for ( size_t d3=0; d3 < 2; ++d3 )

      {

        array3d(d1,d2,d3) = 3;

      }

    }

  }

  array3d(1,1,1) = -99;

  std::cout << "Three Dimensional Arrays in C++";

  std::cout << "\n\n";

  for ( size_t d1=0; d1 < 2; ++d1 )

  {

    for ( size_t d2=0; d2 < 2; ++d2 )

    {

      for ( size_t d3=0; d3 < 2; ++d3 )

        std::cout << "array3d["<< d1 << "][" << d2 << "][" << d3 << "] = " << array3d(d1, d2, d3) << "\n";

    }

  }

}