lua userdata question
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- Subject: lua userdata question
- From: Kuang Chen <kchenphy@...>
- Date: 2010年1月17日 14:29:09 -0800
Hi,
I would like to define an array with the following structure:
typedef struct
{
int size;
double x_values[1]; /* x variable part */
double y_values[1]; /* y variable part */
} PairArray;
As you can see, it is quite similar to the NumArray defined in
ch28, pil, with the only difference being that there are a pair of
values (x,y) for each index. The size of PairArray is provided by user
at run time. Therefore, I wrote a "new" function for PairArray , which
is again similar to the one on pil:
static PairArray PairArray_alloc(lua_State *L, int size)
{
size_t nbytes = sizeof(PairArray) + 2*sizeof(double)*(size-1);
PairArray* p = (PairArray*)lua_newuserdata(L, nbytes);