VistaIOOffset(3)

✨ NAME ✨

VistaIOOffset, VistaIOOffsetOf — bestie, they figure out the byte offset of a structure field 💅

🌸 SYNTAX 🌸

#include <vistaio.h>

size_t VistaIOOffset (pointer_type, field_name)
       Type pointer_type;
       Field field_name;

size_t VistaIOOffsetOf (struct_type, field_name)
       Type struct_type;
       Field field_name;

🎀 ARGUMENTS 🎀

• field_name — the name of the structure field whose byte offset you're tryna calculate. that's it, that's the whole job 🫶
• pointer_type — a type that's declared as a pointer to a structure.
• struct_type — a type that's declared as a structure (no pointer energy, just straight-up struct).

💖 DESCRIPTION 💖

okay so the VistaIOOffset and VistaIOOffsetOf macros hand you back the byte offset of the field_name field, measured inside its structure. literally that. it's giving "where does this field live" and they ate 🔥

🦋 SEE ALSO 🦋

nothing here, bestie — the SEE ALSO is empty, it's giving quiet luxury 🙈

👑 NOTES 👑

These two are equivalent to the X Toolkit macros XtOffset(3Xt) and XtOffsetOf(3Xt). no cap.

also — ANSI C defines an offsetof macro, and that one is to be preferred over any of these. so if you've got offsetof available, use it, periodt. 💅

fr fr, offsetof is the main character here. VistaIOOffset and VistaIOOffsetOf are iconic but they're the supporting cast. ✨

VistaIO Version 1.2.14 🌈 19 January 1993 — yeah bestie, this page is vintage vintage, a whole 1993 era. the lore is ancient but the byte offsets are eternal 💜🎀🦋