iterate a 3d vector
 

I have declared a vector with 3 Dimensions with the first code below.
Then I have managed to push_back all the 3 dimensions so my vector is filled up like this:

vector1[2][2][2]

typedef std::vector<string> String1D;

typedef std::vector<String1D> String2D;

typedef std::vector<String2D> String3D;



String3D vector1;

What I now need to do is to iterate from vector1[0][0][0] until vector1[2][2][2]
with the code below.
But I get a huge of compileerrors. I think The code below can work if you havn´t declared the vector with typedef but I am not sure really.
I wonder if I am near a solution for this ? It is difficult to find examples for 3D vectors.

std::vector< std::vector<string> >::iterator OneDStart = vector1.begin();

std::vector< std::vector<string> >::iterator OneDEnd = vector1.end();

  

for ( ; OneDStart != OneDEnd; OneDStart++ ) 

{  //1D

  std::vector<string>::iterator TwoDStart = OneDStart->begin();

  std::vector<string>::iterator TwoDEnd = OneDStart->end();

  

  for ( ; TwoDStart != TwoDEnd; TwoDStart++ )

  {   //2D

      std::vector<string>::iterator ThreeDStart = TwoDStart->begin();

      std::vector<string>::iterator ThreeDEnd = TwoDEnd->end();

      

      for ( ; ThreeDStart != ThreeDEnd; ThreeDStart++ )

      {   //3D





} //1D

} //2D

} //3D

Re: iterate a 3d vector
 

This works for me

#include <vector>

#include <string>

using namespace std;





typedef std::vector<string> String1D;

typedef std::vector<String1D> String2D;

typedef std::vector<String2D> String3D;



int main()

{

    String3D vector1;        

    String3D::iterator OneDStart = vector1.begin();

    String3D::iterator OneDEnd = vector1.end();

  

    for ( ; OneDStart != OneDEnd; OneDStart++ ) 

    {  //1D

        String2D::iterator TwoDStart = OneDStart->begin();

        String2D::iterator TwoDEnd = OneDStart->end();

        for ( ; TwoDStart != TwoDEnd; TwoDStart++ )

        {   //2D

            String1D::iterator ThreeDStart = TwoDStart->begin();

            String1D::iterator ThreeDEnd = TwoDEnd->end();

            for ( ; ThreeDStart != ThreeDEnd; ThreeDStart++ )

            {   //3D





            } //1D

        } //2D

    } //3D

}

Re: iterate a 3d vector
 

That was fantastico, I saw the adjustments you did to the code and it compiles fine.
When I run the code I am getting an Error message that says:

"Expression: vector iterator not dereferencable"

I dont know what could be ment by this ?

Re: iterate a 3d vector
 

I tried to do this and this works but I dont understand the logic. For me it should be 1D first and 3D last but I begin to iterate the 3:rd dimension at top of code from what I understand.
Shouldn´t I iterate the 1:st dimension first or does this happening but I cant see it ?
It iterates from vector1[0][0][0] until vector[2][2][2]. It is correct !

for (String3D::iterator i = vector1.begin(); i != vector1.end(); ++i)

{

     for (String2D::iterator j = i->begin(); j != i->end(); ++j)

   {

        for (String1D::iterator k = j->begin(); k != j->end(); ++k)

        {

                std::string GetText = *k;

        }

   }

}

Re: iterate a 3d vector
 

If you want a real 3D array C++ surrogate then try indicies, not iterators:

// int base for simplicity

typedef std::vector<int> int1D;

typedef std::vector<int1D> int2D;

typedef std::vector<int2D> int3D;



int main()

{

    int dim = 3;

    int3D v;

    // initiate the cube so v[i][j][k] == ijk...

    v.resize(dim);

    for (int i = 0; i < (int)v.size(); ++i)

    {

        v[i].resize(dim);

        for (int j = 0; j < (int)v[i].size(); ++j)

        {

            v[i][j].resize(dim);

            for (int k = 0; k < (int)v[i][j].size(); ++k)

                v[i][j][k] = (i+1)*100+(j+1)*10+(k+1);

        }

    }



    // print plane by plane then modify cube elements

    for (int i = 0; i < (int)v.size(); ++i)

    {

        cout << i << ":\n"; // i-th plane

        for (int j = 0; j < (int)v.size(); ++j)

        {

            for (int k = 0; k < (int)v.size(); ++k)

            {

                cout << '\t' << v[i][j][k];

                v[i][j][k] = 1; // why? See below

            }

            cout << "\n";        

        }

    }

    cout << endl;



    // calculate sum of elements i*j*k*1 then go to Fortran...

    int sum = 0;

    for (size_t i = 0; i < v.size(); ++i)

    for (size_t j = 0; j < v[i].size(); ++j)

    for (size_t k = 0; k < v[i][j].size(); ++k)

        sum += v[i][j][k];

    // must be 3*3*3 == 27...

    cout << "Sum(v): " << sum << endl;



    return 0;

}

Re: iterate a 3d vector
 

Apropos, dont tread on typedefs: they never create new types, they are type aliases only...