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Here is my guess...
When you overload some sign (eg. <), it looks like a function but you cannot return anything. In order to return the intended results, you have to pass the reference and in this way, when you update Box b, the actual b will also be updated.
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Box It!
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Here is my guess... When you overload some sign (eg. <), it looks like a function but you cannot return anything. In order to return the intended results, you have to pass the reference and in this way, when you update Box b, the actual b will also be updated.