Avoiding the default [super init] boilerplate:

example_usage.m

- (id) initWithObject: (id) object {
    PLSuperInit();

    _object = object;

    return self;
}

PLSuperInit.m

/**
 * @ingroup macros
 *
 * Call the superclass' default zero-argument initializer, returning nil if the superclass' initializer
 * returns nil.
 *
 * This macro is equivalent to:
 *
 * @code
 * if ((self = [super init]) == nil)
 *     return nil;
 * @endcode
 *
 * @par Example Usage
 *
 * @code
 * - (id) initWithString {
 *     PLSuperInit();
 * }
 * @endcode
 */
#define PLSuperInit() do { \
    if ((self = [super init]) == nil) {\
        return nil; \
    } \
} while (NO)