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Partial
specialization of a class template is the mechanism
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that
we can use to cause one implementation of a class to
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have
different behavior than another.
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This
is primarily useful when a class requires different
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behavior
depending on the data types used by the client.
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We
must define the specialized version of the class after
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the
class template is defined or declared
(called the
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primary
template).
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All
members must be completely defined for that version.
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This
means that all member functions must be defined for
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a
specialized class template, even in the case where the
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functionality
is unchanged.
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