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cannot be sent to an abstract object of class
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cannot be sent to an abstract object of class


  • Subject: cannot be sent to an abstract object of class
  • From: Shane <email@hidden>
  • Date: Sat, 4 Dec 2010 17:17:56 -0600

I get the error below when trying to assign a new value (compile
error) to rate in myMethod. Why is this NSNumber considered abstract?
I would like to give it a new value.

@interface
{
	NSNumber *rate;
	// ...
}
// ...
#end

- (id) init
{
	// …
	rate = [[NSNumber alloc] initWithFloat:0.0];
	// now has retain count of 1
}

- (void) myMethod
{
	// ...
	[rate initWithFloat:[[config rate] floatValue]];
	// …
}

*** initialization method -initWithFloat: cannot be sent to an
abstract object of class NSCFNumber: Create a concrete instance!
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