Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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iterator_category
template<
typename Iterator
>
struct iterator_category
{
typedef unspecified type;
};
Returns one of the following iterator category tags: input_iterator_tag, forward_iterator_tag, bidirectional_iterator_tag, or random_access_iterator_tag.
#include "boost/mpl/iterator_category.hpp" #include "boost/mpl/iterator_tag.hpp"
| Parameter | Requirement | Description |
|---|---|---|
Iterator | A model of Input Iterator |
| Expression | Expression type | Precondition | Semantics | Postcondition |
|---|---|---|---|---|
typedef iterator_category<Iterator>::type tag; | An iterator category tag | tag is input_iterator_tag if Iterator is a model of Input Iterator, forward_iterator_tag if Iterator is a model of Forward Iterator, bidirectional_iterator_tag if Iterator is a model of Bidirectional Iterator, or random_access_iterator_tag if Iterator is a model of Random Access Iterator. |
Amortized constant time.
template< typename Iterator >
struct my_algorithm
: my_algorithm_impl<
iterator_category<Iterator>::type
, Iterator
>
{
};
Iterators, Sequence, begin, end, advance, distance