gistfile1.m

// How do you implement lazy loading getters?

- (NSString *)title {
    if ( ! self->_title) {
        NSString *string = @"lazy loaded";
        // Do some real stuff here...
        self->_title = string;
    }
    return self->_title;
}

gistfile2.m

// What about this?

- (NSString *)title LAZY(_title) {
    NSString *string = @"lazy loaded";
    // Do some real stuff here...
    return string;
}




// The `LAZY` macro:

#define LAZY(IVAR) {\
if ( ! self->IVAR) {\
    self->IVAR = [self lazyLoad##IVAR];\
}\
return self->IVAR;\
}\
\
- (NSString *)lazyLoad##IVAR



// After expansion:

- (NSString *)title {
    if ( ! self->_title) {
        self->_title = [self lazyLoad_title];
    }
    return self->_title;
}

- (NSString *)lazyLoad_title {
    NSString *string = @"lazy loaded";
    // Do some real stuff here...
    return string;
}