Pointer and array types
Factor handbook > C library interface > Passing data between Factor and C > C type specifiers

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Pointer types are specified by suffixing a C type with *, for example float*. One special case is void*, which denotes a generic pointer; void by itself is not a valid C type specifier. This syntax constructs a pointer object to represent the C type.

Fixed-size array types are supported; the syntax consists of a C type name followed by dimension sizes in brackets; the following denotes a 3 by 4 array of integers:
int[3][4]

Fixed-size arrays differ from pointers in that they are allocated inside structures and unions; however, when used as function parameters, they behave exactly like pointers with the dimensions only serving as documentation.