Primitive C types - Factor Documentation (original) (raw)
The following numerical types are defined in the alien.c-types vocabulary; a u prefix denotes an unsigned type:
| C type | Notes |
|---|---|
| char | always 1 byte |
| uchar | |
| short | always 2 bytes |
| ushort | |
| int | always 4 bytes |
| uint | |
| long | same size as CPU word size and void*, except on 64-bit Windows, where it is 4 bytes |
| ulong | |
| longlong | always 8 bytes |
| ulonglong | |
| float | single-precision float (not the same as Factor's float class!) |
| double | double-precision float (the same format as Factor's float objects) |
C99 complex number types are defined in the alien.complex vocabulary.
When making alien calls, Factor numbers are converted to and from the above types in a canonical way. Converting a Factor number to a C value may result in a loss of precision.