[Cython] [newb] Howto build 'rectangle' demo

[Robert Bradshaw]

On Feb 26, 2008, at 5:58 PM, Neal Becker wrote:

> I'm trying to follow:
> http://wiki.cython.org/WrappingCPlusPlus
> What am I doing wrong?
>
> ===== Rectangle.h
> class Rectangle {
> public:
>   int x0, y0, x1, y1;
>   Rectangle(int x0, int y0, int x1, int y1);
>   ~Rectangle();
>   int getLength();
>   int getHeight();
>   int getArea();
>   void move(int dx, int dy);
> };
>
> ===== rectangle.pyx
> cdef extern from "Rectangle.h":
>     ctypedef struct c_Rectangle "Rectangle":
>         int x0, y0, x1, y1
>         int (*getLength)()
>         int (*getHeight)()
>         int (*getArea)()
>         void (*move)(int dx, int dy)
>     c_Rectangle *new_Rectangle "new Rectangle" (int x0, int y0, int  
> x1, int y1)
>     void del_Rectagle "delete" (c_Rectangle *rect)
>
> cdef class Rectangle:
>     c_Rectangle *thisptr      # hold a C++ instance which we're  
> wrapping

This line should be "cdef c_Rectangle *thisptr # ..."

cdef is the keyword that says "the following is not real Python"

>     def __cinit__(self, int x0, int y0, int x1, int y1):
>         self.thisptr = new_Rectangle(x0, y0, x1, y1)
>     def __dealloc__(self):
>         del_Rectangle(self.thisptr)
>     def getLength(self):
>         return self.thisptr.getLength()
>     def getHeight(self):
>         return self.thisptr.getHeight()
>     def getArea(self):
>         return self.thisptr.getArea()
>     def move(self, dx, dy):
>         self.thisptr.move(dx, dy)
> =========
>
>
>  cython rectangle.pyx
>
> Error converting Pyrex file to C:
> ------------------------------------------------------------
> ...
>         void (*move)(int dx, int dy)
>     c_Rectangle *new_Rectangle "new Rectangle" (int x0, int y0, int  
> x1, int y1)
>     void del_Rectagle "delete" (c_Rectangle *rect)
>
> cdef class Rectangle:
>     c_Rectangle *thisptr      # hold a C++ instance which we're  
> wrapping
>                ^
> ------------------------------------------------------------
>
> /home/nbecker/cython/rectangle.pyx:12:16: 'c_Rectangle' is not a  
> constant, variable or function identifier
> ... more errors...
>
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