gistfile1.m

#define $(...) \
    ({ \
        __weak __typeof__(self) weakSelf = self; \
        \
        ^(__VA_ARGS__) { \
            __strong __typeof__(weakSelf) self = weakSelf; \
            $_body_

#define $_body_(...) \
            __VA_ARGS__ \
        }; \
    })

$(id arg1, unsigned arg2)({
    [self doSomething:arg1 withInterestingValue:arg2];
});