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Synthesized properties in Objective-C without instance variables

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Foo.h
Objective-C
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@interface Foo : NSObject {}
@property(assign) float foo;
@end
Foo.m
Objective-C
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#import "Foo.h"
 
// Private interface
@interface Foo ()
@property(assign) float bar;
@end
 
@implementation Foo
@synthesize foo, bar;
 
- (void) doSomething
{
foo = bar = 1;
}
 
@end

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