class my_input_iterator : public input_iterator<double>
{
...
};
This declares my_input_iterator to be an Input Iterator whose value type is double and whose distance type is ptrdiff_t. If Iter is an object of class my_input_iterator, then iterator_category(Iter) will return input_iterator_tag(), value_type(Iter) will return (double*) 0, and distance_type(Iter) will return (ptrdiff_t*) 0. Definition Defined in the standard header iterator, and in the nonstandard backward-compatibility header iterator.h. This class is no longer part of the C++ standard, although it was present in early drafts of the standard. It is retained in this implementation for backward compatibility. Template parameters Parameter Description Default T The iterator's value type Distance The iterator's distance type ptrdiff_t Model ofAssignable Public base classes None Type requirements The distance type must be a signed integral type. Public base classes None. Members None. New Members None. Notes
[1] It is not required that an Input Iterator inherit from the base input_iterator. It is, however, required that the functions iterator_category, distance_type, and value_type be defined for every Input Iterator. (Or, if you are using the iterator_traits mechanism, that iterator_traits is properly specialized for every Input Iterator.) Since those functions are defined for the base input_iterator, the easiest way to ensure that are defined for a new iterator class is to derive that class from input_iterator and rely on the derived-to-base standard conversion of function arguments.
See also The Iterator Tags overview, iterator_traits, iterator_category, value_type, distance_type, output_iterator, forward_iterator, bidirectional_iterator, random_access_iterator STL Main PageRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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