search for: structgep

Is a series of fields in a structure guaranteed to have the same layout as those fields in a structure on their own? That is, can I cast a pointer within a main structure to an equivalent type? X = { a, b, c, d, e } Y = { c, d, e } y = BitCast( StructGEP( some_x, 2 ), Y* ) Is that a valid cast? -- edA-qa mort-ora-y Leaf Creator Leaf - the language we always wanted http://leaflang.org/

...ct alignment question > Is a series of fields in a structure guaranteed to have the same layout > as those fields in a structure on their own? That is, can I cast a > pointer within a main structure to an equivalent type? > X = { a, b, c, d, e } > Y = { c, d, e } > y = BitCast( StructGEP( some_x, 2 ), Y* ) > Is that a valid cast? In general, no. If a, b, and c were char, and d was an int, using typical C alignments, there would be one slack byte between c and d in X, whereas there would be three in Y. You could probably force what you want with packed structures or by playin...