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If we
define data members that are themselves template
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classes,
the classes are not implicitly instantiated until
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those
members are first used.
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In
the following class, the list_object data member's class
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is
not implicitly instantiated until the point at which data
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member
is first used.
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On
the down side, unless explicit instantiation (explained
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in
the next section) is requested, errors can only be found
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by
explicitly using all member functions for each use
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expected.
This applies to syntax errors as well as run time
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errors.
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