small string optimization in c
- 16 byte data structure (4 fit in a cache line)
- up to 15 characters + null terminator can be stored in place
- size and capacity are always in place
each s is a 16 byte union.
the 16th byte is used as a null terminator and to store some metadata.
longer strings are allocated on the heap. the union holds a pointer to a malloced area, a size and a capacity.
to fit in 16 bytes, strings are limited to 2^54-1 characters.
add #include "s.h" and compile s.c
to build the example program, use gcc-or-clang s.c test.c
read s.h to learn about the api
isc