On Wed, Feb 16, 2022 at 01:07:37PM +0100, Laslo Hunhold wrote: > @all: why not make a static compile-time-check on LENGTH(tags) and vary > the type accordingly? > > #if LENGTH(tags) < 8 > typedef tag_bitmap uint_least8_t; > #elif LENGTH(tags) < 16 > typedef tag_bitmap uint_least16_t; > #elif LENGTH(tags) < 32 > typedef tag_bitmap uint_least32_t; > #elif LENGTH(tags) < 64 > typedef tag_bitmap uint_least64_t; > #else > #error "tags-array too long" > #endif
Hi Laslo, I don't think this is possible, at least not with the LENGTH macro. The pre-processor doesn't have access to `sizeof` operator. - NRK
