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";
}
}
}
