That's related to something I would like which is to be able to set the number of elements in an incomplete struct. struct foo { size_t elements;

That's related to something I would like which is to be able to set the number of elements in an incomplete struct. struct foo { size_t elements; int data[]; }; foo foo123 = {.elements = array_size(data), .data = {1, 2, 3}}; or struct str { size_t sz; char str[]; }; str s123 = {.sz = strlen(.str), .str = "123"};