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C++: InputIterator

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InputIterator Iterator, , .
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An InputIterator is an Iterator that can read from the pointed-to element.
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, It InputIterator, a b It :
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In addition to the above requirements, for a type It to be an InputIterator, instances a and b of It must:
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Expression Return Equivalent expression Notes
a != b bool !(a == b)
*a value_type If a == b equivalent to *b
a->m (*a).m
++a It& After this, copies of a may be invalidated
a++ ++a
*a++ value_type value_type t = *a; ++a; return t;
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