Meaning of Objective-C macros prefixed with an at (@) symbol

Question

The ReactiveCocoa framework makes use of weakify and strongify macros, both of which are preceded by an \'@\' symbol.

Here\'s an example (From

Answer 1

The @ isn't part of the macro. weakify is defined as:

#define weakify(...) \
    autoreleasepool {} \
    metamacro_foreach_cxt(ext_weakify_,, __weak, __VA_ARGS__)

So @weakify(self) becomes:

@autorelease {} metamacro_foreach_cxt(ext_weakify_,, __weak, self)