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We
can specify a non-type identifier in the template
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formal
argument list, prefaced by its data type.
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A
non-type specifier allows the identifier listed to be
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substituted
for a value specified by the client at
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instantiation
time.
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template
<data_type nontype_identifier>
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The
data type of non-type identifiers must be an integral
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type,
an enumeration type, a pointer to an object, a
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reference
to an object, a pointer to a function, a reference
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to a
function, or a pointer to a member.
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They
cannot be void or a floating point type.
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