Assign single dimension array as an element of two(multi) dimensional array

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Let us typedef single and two(multi) dimensional arrays respectively as below:

C++

typedef float VERTREX[3];
typedef VERTREX TRIANGLE[3];

then say I have initialized some VERTEX arrays,

VERTREX v1 = { 1, 2, 3 };
VERTREX v2 = { 2, 2, 3 };
VERTREX v3 = { 1, 2, 1 };

Assume mathematically a Triangle defined by combination of three vertices,therefore I defined a Triangle as following code snippet,

C++

TRIANGLE tr;

Problem arisen when I am going to assign each VERTEX(single dimension array) elements in to TRIANGLE(Array of arrays/2-Dimensional array) as below code,

C++

tr[0] = v1; // error C2106: '=' : left operand must be l-value(in Visual C++ compiler)

tr[1] = v2; //  error C2106:
tr[2] = v3; //  error C2106:

Also I cannot continue with creating array of Triangles too.

C++

TRIANGLE tr[4]; // creating array of Triangles

hence same behavior as expected.
If someone has an idea/solution how to assign Single Dimension array as an element of Two(Multi) Dimensional array please respond.Please do not provide solution with standard containers like std::vector or using raw pointers approach.
Please bound to array concept.
Thank you everyone for listening.

What I have tried:

Tried to create pointers to each Vertex arrays,but,it failed my optimization concept.

Posted 19-May-16 17:52pm

Buddhi Chaturanga

Updated 19-May-16 19:28pm

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Buddhi Chaturanga · Accepted Answer · 2016-05-19T19:27:00

C++

typedef float VERTREX[3];
typedef VERTREX* TRIANGLE[3];

int main()
{
    VERTREX v1 = { 1, 2, 3 };
    VERTREX v2 = { 11, 21, 13 };
    VERTREX v3 = { 1, 12, 41 };


    TRIANGLE tr;
    tr[0] = &v1;
    tr[1] = &v2;
    tr[2] = &v3;
    tr[3] = &v3;  --(1)// Concept(Array size) violation - Expect Runtime error 

    std::cout << (*(&v3))[2] << std::endl;
    std::cout << (*tr[2])[2] << std::endl;

    system("Pause");
    return 0;
}

// Compile with Visual C++(v.120) with Warning Level 4 ,No warning if we eliminate the line (1), here output: 41 41

Buddhi Chaturanga · Accepted Answer · 2016-05-19T19:28:00

Solution 2

C++

typedef float VERTREX[3];
typedef float* TRIANGLE[3];

int main() {

  VERTREX v1 = { 1, 2, 3 };
  VERTREX v2 = { 2, 2, 3 };
  VERTREX v3 = { 1, 2, 1 };

  TRIANGLE tr;

  tr[0] = v1;
  tr[1] = v2;
  tr[2] = v3;

  TRIANGLE triangle[4];
  return 0;
}

Posted 19-May-16 19:28pm