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Notes

[1] Note that distance_type is not defined for Output Iterators or for Trivial Iterators. In the case of Output Iterators, this is because an Output Iterator does not have a value type: it is not possible to dereference an Output Iterator and obtain a value. In the case of Trivial Iterators, this is because the concept was introduced only for conceptual clarity, in order to separate the axioms related to an object that refers to another object from those related to iteration over a range. In fact, the STL does not define any types that are Trivial Iterators. Although built-in C pointers may be Trivial Iterators, the C type system does not allow a distinction between pointers that are Trivial Iterators and pointers that are Random Access Iterators into C arrays. Consequently, there is no Trivial Iterator category tag or iterator base.

[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.


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







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