I am trying to create a grid, From what I understand the issue is coming from using a pointer of a template class inside its self which is legal until i try to do stuff with it is when the compiler complains. I am looking for a way to use pointer's to a class of a template inside its self for use in using the pointers and do what I will later. I compile with g++ version 5 the compile command i use is g++ *.cpp -o main -std=c++11 the error i get will follow the snippet for the code.
struct Vector2D
{
Vector2D( ) { }
Vector2D( int x , int y ): x( x ) , y( y ) { } ;
int x , y ;
} ;
template <typename A>
class GridNode2D ;
template <typename T>
class GridNode2D
{
public:
GridNode2D( ) { } ;
T data ;
Vector2D coOrdinate ;
GridNode2D<T>* left, right, up, down ;
} ;
template <typename T>
class Grid2D
{
public:
Grid2D( ) ;
GridNode2D<T>* head ;
} ;
template <typename T>
Grid2D<T>::Grid2D( )
{
this->head = new GridNode2D<T> ;
this->head->right = new GridNode2D<T> ;
} ;
Errors:
main.cpp: In instantiation of ‘class GridNode2D<bool>’:
<span class="error_line" onclick="ide.gotoLine('main.cpp',39)">main.cpp:39:16</span>: required from ‘Grid2D<T>::Grid2D() [with T = bool]’
<span class="error_line" onclick="ide.gotoLine('main.cpp',47)">main.cpp:47:18</span>: required from here
main.cpp:22:26: error: ‘GridNode2D::right’ has incomplete type
GridNode2D<T>* left, right, up, down ;
^
main.cpp:15:7: note: definition of ‘class GridNode2D’ is not complete until the closing brace
class GridNode2D
^
main.cpp:22:33: error: ‘GridNode2D::up’ has incomplete type
GridNode2D<T>* left, right, up, down ;
^
main.cpp:15:7: note: definition of ‘class GridNode2D’ is not complete until the closing brace
class GridNode2D
^
main.cpp:22:37: error: ‘GridNode2D::down’ has incomplete type
GridNode2D<T>* left, right, up, down ;
^
main.cpp:15:7: note: definition of ‘class GridNode2D’ is not complete until the closing brace
class GridNode2D
