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To
distinguish the prefix from the postfix forms,
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the C++ standard has added an unused
argument
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(int)
to represent the postfix signature.
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Since
these operators should modify the current
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object,they
should not be const members!
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Prefix:
residual vlaue is an lvalue
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counter
& counter::operator ++ () { .... //body }
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counter
& counter::operator -- () { .... //body }
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Postfix: residual value is an rvalue,
different than
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the
current object!
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counter
counter::operator ++ (int) { .... //body }
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counter
counter::operator -- (int) { .... //body }
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