Trying to avoid having ugly weakBlah variables all over the place to avoid retain cycles (or at least having to look at them)

1_before.m

__weak __typeof__(foo) weakFoo = foo;
foo.block = ^
{
    [weakFoo doSomething];
};

2_after.m

#define HNHWeakCapture(obj) __weak __typeof__(obj) _HNHWeak_##obj = obj
#define HNHWeakRef(obj) _HNHWeak_##obj

HNHWeakCapture(foo);
foo.block = ^
{
    [HNHWeakRef(foo) doSomething];
};