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Notes

[1] The STL also defines one other concept, Trivial Iterator. This concept is introduced only for conceptual clarity, however, 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.

[2] Any type that is a model of Forward Iterator is also a model of Input Iterator, any type that is a model of Bidirectional Iterator is also a model of Forward Iterator, and any type that is a model of Random Access Iterator is also a model of Bidirectional Iterator. Iterator_category must return a tag representing the most specific concept that its argument is a model of. If its argument is a vector::iterator, for example, then it must return random_access_iterator_tag.

[3] 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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