std::iterator

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Iterator library

Iterator primitives
iterator_traits
input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tag
iterator
Iterator adaptors
reverse_iterator move_iterator (C++11) back_insert_iterator front_insert_iterator insert_iterator	make_reverse_iterator (C++14) make_move_iterator (C++11) back_inserter front_inserter inserter
Stream iterators
istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Iterator operations
advance
distance
prev (C++11)
next (C++11)
Range access
begincbegin (C++11)(C++14)
endcend (C++11)(C++14)
rbegincrbegin (C++14)(C++14)
rendcrend (C++14)(C++14)
Container access
size (C++17)
empty (C++17)
data (C++17)

 

Defined in header <iterator>
template<     class Category,     class T,     class Distance = std::ptrdiff_t,     class Pointer = T*,     class Reference = T& > struct iterator;

std::iterator is the base class provided to simplify definitions of the required types for iterators.

Template parameters

Category	-	the category of the iterator. Must be one of iterator category tags.
T	-	the type of the values that can be obtained by dereferencing the iterator. This type should be void for output iterators.
Distance	-	a type that can be used to identify distance between iterators
Pointer	-	defines a pointer to the type iterated over (T)
Reference	-	defines a reference to the type iterated over (T)

Member types

Member type	Definition
iterator_category	Category
value_type	T
difference_type	Distance
pointer	Pointer
reference	Reference

See also

iterator_traits	provides uniform interface to the properties of an iterator (class template)
input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tag	empty class types used to indicate iterator categories (class)