Namensräume
Varianten
Aktionen

std::iterator_traits

Aus cppreference.com
< cpp‎ | iterator

 
 
Iterator Bibliothek
Iterator Primitiven
Original:
Iterator primitives
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
iterator_traits
input_iterator_tag
output_iterator_tag
forward_iterator_tag
bidirectional_iterator_tag
random_access_iterator_tag
iterator
Iterator Adaptern
Original:
Iterator adaptors
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
reverse_iterator
Stream-Iteratoren
Original:
Stream iterators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Iterator Operationen
Original:
Iterator operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
advance
distance
prev(C++11)
next(C++11)
Reichen Zugang
Original:
Range access
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
begin(C++11)
end(C++11)
 
Defined in header <iterator>
template< class Iterator>
struct iterator_traits;
template< class T >
struct iterator_traits<T*>;
template< class T >
struct iterator_traits<const T*>;
std::iterator_traits ist die Art Trait-Klasse, die einheitliche Schnittstelle zu den Eigenschaften des Iterator-Typen. Dies macht es möglich, Algorithmen nur hinsichtlich Iteratoren implementieren .
Original:
std::iterator_traits is the type trait class that provides uniform interface to the properties of iterator types. This makes it possible to implement algorithms only in terms of iterators.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Inhaltsverzeichnis

[Bearbeiten] Mitglied Typen

Mitglied Typ
Original:
Member type
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Definition
difference_type Iterator::difference_type
value_type Iterator::value_type
pointer Iterator::pointer
reference Iterator::reference
iterator_category Iterator::iterator_category

[Bearbeiten] Spezialisierungen

Diese Art Charakterzug kann spezialisiert für Typen, die als Iteratoren verwendet werden kann vom Benutzer zur Verfügung gestellt werden. Die Standard-Bibliothek bietet zwei partielle Spezialisierungen für Zeigertypen T *, die es ermöglicht, alle Iterator-basierte Algorithmen mit rohen Zeigern macht .
Original:
This type trait may be specialized for user-provided types that may be used as iterators. The standard library provides two partial specializations for pointer types T*, which makes it possible to use all iterator-based algorithms with raw pointers.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[Bearbeiten] T * Spezialisierung Mitglied Typen

Mitglied Typ
Original:
Member type
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Definition
difference_type std::ptrdiff_t
value_type T
pointer T*
reference T&
iterator_category std::random_access_iterator_tag

[Bearbeiten] const T * Spezialisierung Mitglied Typen

Mitglied Typ
Original:
Member type
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Definition
difference_type std::ptrdiff_t
value_type T
pointer const T*
reference const T&
iterator_category std::random_access_iterator_tag

[Bearbeiten] Beispiel

Allzweck-reverse ()-Implementierung für bidirektionale Iteratoren
Original:
general-purpose reverse() implementation for bidirectional iterators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <iostream>
#include <iterator>
#include <vector>
#include <list>
 
template<class BDIter>
void my_reverse(BDIter first, BDIter last)
{
    typename std::iterator_traits<BDIter>::difference_type n = std::distance(first, last);
    --n;
    while(n > 0) {
        typename std::iterator_traits<BDIter>::value_type tmp = *first;
        *first++ = *--last;
        *last = tmp;
        n -= 2;
    }
}
 
int main()
{
    std::vector<int> v{1,2,3,4,5};
    my_reverse(v.begin(), v.end());
    for(int n : v)
        std::cout << n << ' ';
    std::cout << '\n';
 
    std::list<int> l{1,2,3,4,5};
    my_reverse(l.begin(), l.end());
    for(auto n : l)
        std::cout << n << ' ';
    std::cout << '\n';
 
//    std::istreambuf_iterator<char> i1(std::cin), i2;
//    my_reverse(i1, i2); // compilation error
 
}

Output:

5 4 3 2 1
5 4 3 2 1

[Bearbeiten] Siehe auch

die grundlegende Iterator
Original:
the basic iterator
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(Klassen-Template) [edit]
leere Klasse-Typen verwendet werden, um Iterator Kategorien anzuzeigen
Original:
empty class types used to indicate iterator categories
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(Klasse) [edit]