[Cython] how would I wrap something like this in a .pxd file

[Chris Colbert]

In wrapping a C library, I come across many #define statements that I
need to use elsewhere. When they simply define a constant, I use an
anonymous enum and all is well.

But how would I wrap something like this that shown up in a header
file that i'm cdef extern'ing from:

#define CV_TREE_NODE_FIELDS(node_type)                               \

    int       flags;                \

    int       header_size;          \

    struct    node_type* h_prev;      \

    struct    node_type* h_next;     \

    struct    node_type* v_prev;       \

    struct    node_type* v_next ;


or something like this:

#define CV_IS_STORAGE(storage)  \

    ((storage) != NULL &&       \

    (((CvMemStorage*)(storage))->signature & CV_MAGIC_MASK) ==
CV_STORAGE_MAGIC_VAL)




Thanks and Cheers!

Chris
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