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>>>>> "Marc" == Marc Feeley <feeley@xxxxxxxxxxxxxxxx> writes: Marc> To avoid the tedium of writing by hand the associated Scheme-to-C and Marc> C-to-Scheme conversion functions (i.e. "FILENAME_FROM_SCHEME" and Marc> "FILENAME_TO_SCHEME", "STREAM_FROM_SCHEME", ...), a way to define type Marc> aliases on the C side of the FFI is useful so that one can write in a Marc> C header file something like: Marc> /* file: "my_types.h" */ Marc> #include "basic_types.h" Marc> #ifdef UNICODE Marc> #define FILENAME NONNULL_UCS2STAR Marc> #define FILENAME_FROM_SCHEME NONNULL_UCS2STAR_FROM_SCHEME Marc> #define FILENAME_TO_SCHEME NONNULL_UCS2STAR_TO_SCHEME Marc> #else Marc> #define FILENAME NONNULL_CHARSTAR Marc> #define FILENAME_FROM_SCHEME NONNULL_CHARSTAR_FROM_SCHEME Marc> #define FILENAME_TO_SCHEME NONNULL_CHARSTAR_TO_SCHEME Marc> #endif I think I'm missing a crucial bit here: Where do NONNULL_UCS2STAR_FROM_SCHEME, NONNULL_UCS2STAR_TO_SCHEME and associates come from? What's "a way to define type aliases on the C side of the FFI"? -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla