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Notes

[1] Note that distance_type is not defined for Output Iterators or for Trivial Iterators. There is no meaningful definition of a distance for either of those concepts, so there is no need for a distance type.

[2] The iterator_traits class relies on a C++ feature known as partial specialization. Many of today's compilers don't implement the complete standard; in particular, many compilers do not support partial specialization. If your compiler does not support partial specialization, then you will not be able to use iterator_traits, and you will have to continue using the functions iterator_category, distance_type, and value_type. This is one reason that those functions have not yet been removed.

[3] This use of an auxiliary function is an extremely common idiom: distance_type is almost always used with auxiliary functions, simply because it returns type information in a form that is hard to use in any other way. This is one of the reasons that distance_type is so much less convenient than iterator_traits.


Example | Standard Template Library Programmer`s Guide | See also







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