Convert a UTF-8 string to UCS-2.
Defined in <SDL3/SDL_stdinc.h>
#define SDL_iconv_utf8_ucs2(S)      SDL_reinterpret_cast(Uint16 *, SDL_iconv_string("UCS-2", "UTF-8", S, SDL_strlen(S)+1))| S | the string to convert. | 
Returns a new string, converted to the new encoding, or NULL on error.
This is a helper macro that might be more clear than calling SDL_iconv_string directly. However, it double-evaluates its parameter, so do not use an expression with side-effects here.
This macro is available since SDL 3.2.0.