I have the follwing C function. How should I wrap it so it can be called from a Lua script?

typedef struct tagT{
    int a ; 
    int b ;
} type_t;

int lib_a_f_4(type_t *t)
{
     return t->a * t->b ;
}

I know how to wrapr it if the function parameter type were int or char *. Should I use table type for a C structure?

EDIT: I am using SWIG for the wraping , according to this doc, It seems that I should automatically have this funtion new_type_t(2,3) , but it is not the case.

If you wrap a C structure, it is also mapped to a Lua userdata. By adding a metatable to the userdata, this provides a very natural interface. For example,

struct Point{ int x,y; };

is used as follows:

p=example.new_Point() p.x=3 p.y=5 print(p.x,p.y) 3 5

Similar access is provided for unions and the data members of C++ classes. C structures are created using a function new_Point(), but for C++ classes are created using just the name Point().