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In this case it is not needed, but used because seen somewhere without any understanding why. The get*() functions are public API, thus no need for friend here. Then again, if you replace D.getLength() with D.l you need a friend, because "l" is private and operator<< can't use it.
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In this case it is not needed, but used because seen somewhere without any understanding why. The get*() functions are public API, thus no need for friend here. Then again, if you replace D.getLength() with D.l you need a friend, because "l" is private and operator<< can't use it.