3d arrays

Can we create 3d arrays in c++ programs?

You can create an array of any element type.

That element type can be another array type, or an array of arrays, or an array of arrays of arrays, or... etc.

So you can create arrays of any number of dimensions.

NPcomplete (174)

can we print them in 3d format?

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MikeyBoy (5631)

What is "3d format"?

NPcomplete (174)

by "3d format" i mean one 2d array infront/behind another 2d array.

MikeyBoy (5631)

So, you mean some kind of graphical display? There's nothing at all that would make that impossible to write, using some kind of UI/graphics library.

I don't know of any ready-made libraries that do that already, but it's possible someone else has written something.

Last edited on

NPcomplete (174)

yeah, exactly i meant graphical display.

JLBorges (13770)

> yeah, exactly i meant graphical display.

Do you really need a graphical display to present a 3d array in an understandable form?
For instance, is an output which looks something like this all that hard to understand?

#include <iostream>
#include <iomanip>
#include <string>
#include <numeric>
#include <iterator>

template < typename T, std::size_t A, std::size_t B, std::size_t C >
using array_3d = T[A][B][C] ;

template < typename T, std::size_t A, std::size_t B, std::size_t C >
std::ostream& operator<< ( std::ostream& stm, const array_3d<T,A,B,C>& a3d )
{
    const int width = stm.width() ;
    const char fill = stm.fill() ;
    int spacer = width ;

    for( const auto& a2d : a3d )
    {
        for( const auto& row : a2d )
        {
            std::cout << std::string( spacer, ' ' ) ;
            for( const T& v : row ) 
                stm << std::setw(width) << std::setfill(fill) << v << ' ' ;
            stm << '\n' ;
        }
        std::cout << '\n' ;
        spacer += width + 1 ;
    }

    return stm ;
}

int main()
{
    int a[3][4][5] ;
    std::iota( std::begin( a[0][0] ), std::end( a[2][3] ), 0 ) ;

    std::cout << "the array contains:\n\n" << std::setw(3) << a << '\n' ;
}
























the array contains:

     0   1   2   3   4 
     5   6   7   8   9 
    10  11  12  13  14 
    15  16  17  18  19 

        20  21  22  23  24 
        25  26  27  28  29 
        30  31  32  33  34 
        35  36  37  38  39 

            40  41  42  43  44 
            45  46  47  48  49 
            50  51  52  53  54 
            55  56  57  58  59

http://coliru.stacked-crooked.com/a/44589e287378fe39

NPcomplete (174)

@JLBorges
as for now and for me, it doesn't matter if output is understandable. i'm just experimenting with c++

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