(or set multiple objects with one value) Is there a way to send multiple objects one message in one line.
So like
[someObject, otherObject reset];
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In short, no, neither Objective-C nor C support this feature. As an extreme measure, you can use -[NSArray makeObjectsPerformSelector:] and -[NSArray makeObjectsPerformSelector:withObject:], such as
[[NSArray arrayWithObjects:someObject, otherObject, nil] makeObjectsPerformSelector:@selector(reset)];