How embed an __uint128_t? about mlib

[P-p-H-d]

Your code is nearly right. The oplist definition is ok. The error is somewhere else. You should use :
typedef __uint128_t uint128_t;
instead of
#define uint128_t __uint128_t

The macros M_OPL_name() only works with types defines with typedef (well, to be exact with types that are expanded by the preprocessor as single token type).

What happens is that in TUPLE_DEF2(my_tuple, (x, int), (y, uint128_t)),
uint128_t was replaced by __uint128_t, before M*LIB is able to test if the oplist exists.
So it tests for the existence of the macro M_OPL___uint128_t() instead of M_OPL_uint128_t().
Since such macro doesn't exist, it uses the standard type oplist which is not compatible with
__uint128_t (in C11, it is compatible in C99) due to incompatible OUT_STR, IN_STR, GET_STR, PARSE_STR methods.

[mario-tux]

Ok, thanks. The use of #define to create new type is an old bad habit...