andlabs-ui/darwintest/bleh_darwin.m

/* 28 february 2014 */

/*
I wanted to avoid invoking Objective-C directly, preferring to do everything directly with the API. However, there are some things that simply cannot be done too well; for those situations, there's this. It does use the Objective-C runtime, eschewing the actual Objective-C part of this being an Objective-C file.

The main culprits are:
- data types listed as being defined in nonexistent headers
- 32-bit/64-bit type differences that are more than just a different typedef

Go wrapper functions (bleh_darwin.go) call these directly and take care of stdint.h -> Go type conversions.
*/

#include <objc/message.h>
#include <objc/objc.h>
#include <objc/runtime.h>

#include <stdint.h>

#include <Foundation/NSGeometry.h>

/*
NSUInteger is listed as being in <objc/NSObjCRuntime.h>... which doesn't exist. Rather than relying on undocumented header file locations or explicitly typedef-ing NSUInteger to the (documented) unsigned long, I'll just place things here for maximum safety. I use uintptr_t as that should encompass every possible unsigned long.
*/

id _objc_msgSend_uint(id obj, SEL sel, uintptr_t a)
{
	return objc_msgSend(obj, sel, (NSUInteger) a);
}

/*
These are the objc_msgSend() wrappers around NSRect. The problem is that while on 32-bit systems, NSRect is a concrete structure, on 64-bit systems it's just a typedef to CGRect. While in practice just using CGRect everywhere seems to work, better to be safe than sorry.

I use int64_t for maximum safety, as my coordinates are stored as Go ints and Go int -> C int (which is what is documented as happening) isn't reliable.
*/

#define OurRect() (NSMakeRect((CGFloat) x, (CGFloat) y, (CGFloat) w, (CGFloat) h))

id _objc_msgSend_rect(id obj, SEL sel, int64_t x, int64_t y, int64_t w, int64_t h)
{
	return objc_msgSend(obj, sel, OurRect());
}

id _objc_msgSend_rect_uint_uint_bool(id obj, SEL sel, int64_t x, int64_t y, int64_t w, int64_t h, uintptr_t b, uintptr_t c, BOOL d)
{
	return objc_msgSend(obj, sel, OurRect(), (NSUInteger) b, (NSUInteger) c, d);
}