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std::istreambuf_iterator

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< cpp‎ | iterator

 
 
Bibliothèque Iterator
Primitives Iterator
Original:
Iterator primitives
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iterator_traits
input_iterator_tag
output_iterator_tag
forward_iterator_tag
bidirectional_iterator_tag
random_access_iterator_tag
iterator
Adaptateurs Iterator
Original:
Iterator adaptors
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reverse_iterator
Itérateurs de flux
Original:
Stream iterators
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istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Opérations Iterator
Original:
Iterator operations
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advance
distance
prev (C++11)
next (C++11)
Gamme d'accès
Original:
Range access
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begin (C++11)
end (C++11)
 
std::istreambuf_iterator
Les fonctions membres
Original:
Member functions
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istreambuf_iterator::istreambuf_iterator
istreambuf_iterator::operator*
istreambuf_iterator::operator->

(C++11)
istreambuf_iterator::operator++
istreambuf_iterator::operator++(int)
istreambuf_iterator::equal
Tiers fonctions
Original:
Non-member functions
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operator==
operator!=
 
Defined in header <iterator>
template< class CharT, class Traits = std::char_traits<CharT> >

class istreambuf_iterator : public std::iterator< std::input_iterator_tag,
                                                  CharT,
                                                  typename Traits::off_type,
                                                  /* unspecified, usually CharT* */,

                                                  CharT >
std::istreambuf_iterator est un itérateur d'entrée en un seul passage qui lit les caractères successifs de l'objet std::basic_streambuf pour lequel il est construit. L'opération de lecture réelle est effectuée lorsque l'itérateur est incrémenté, pas quand il est déréférencé. Le premier caractère peut être lu lorsque l'itérateur est construit ou lorsque le déréférencement premier pas est fait. Dans le cas contraire, le déréférencement ne retourne une copie du personnage le plus lu récemment .
Original:
std::istreambuf_iterator is a single-pass input iterator that reads successive characters from the std::basic_streambuf object for which it was constructed. The actual read operation is performed when the iterator is incremented, not when it is dereferenced. The first character may be read when the iterator is constructed or when the first dereferencing is done. Otherwise, dereferencing only returns a copy of the most recently read character.
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La valeur par défaut construit std::istreambuf_iterator est connue comme la fin de flux itérateur. Quand un std::istreambuf_iterator valide atteint la fin du flux sous-jacent, il devient égal à l'itérateur de fin de courant. Déréférencement ou l'incrémentant invoque par ailleurs un comportement indéfini .
Original:
The default-constructed std::istreambuf_iterator is known as the end-of-stream iterator. When a valid std::istreambuf_iterator reaches the end of the underlying stream, it becomes equal to the end-of-stream iterator. Dereferencing or incrementing it further invokes undefined behavior.
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std::istreambuf_iterator a un constructeur de copie trivial, un constructeur par défaut constexpr, et un destructeur trivial .
Original:
std::istreambuf_iterator has a trivial copy constructor, a constexpr default constructor, and a trivial destructor.
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Sommaire

[modifier] Types de membres

Type du membre Définition
char_type CharT
traits_type Traits
int_type typename traits::int_type
streambuf_type std::basic_streambuf<CharT, Traits>
istream_type std::basic_istream<CharT, Traits>

[modifier] Fonctions membres

construit un nouveau istreambuf_iterator
Original:
constructs a new istreambuf_iterator
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(fonction membre publique)
(destructor)
(implicitement déclaré)
destructs an istreambuf_iterator
(fonction membre publique)

(depuis C++11)
obtient une copie du courant character
accesses un élément du caractère en cours, si CharT a des membres
Original:
obtains a copy of the current character
accesses a member of the current character, if CharT has members
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(fonction membre publique)
les progrès de la istreambuf_iterator
Original:
advances the istreambuf_iterator
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(fonction membre publique)
si les deux essais sont istreambuf_iterators de fin de courant ou si les deux sont valides
Original:
tests if both istreambuf_iterators are end-of-stream or if both are valid
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(fonction membre publique)

[modifier] Fonctions annexes

compare deux istreambuf_iterators
Original:
compares two istreambuf_iterators
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(fonction générique)

Inherited from std::iterator

Member types

Type du membre Définition
value_type CharT
difference_type Traits::off_type
pointer /* unspecified, usually CharT* */
reference CharT
iterator_category std::input_iterator_tag

[modifier] Exemple

#include <vector>
#include <sstream>
#include <iostream>
#include <iterator>
int main()
{
    // typical use case: an input stream represented as a pair of iterators
    std::istringstream in("Hello, world");
    std::vector<char> v( (std::istreambuf_iterator<char>(in)),
                          std::istreambuf_iterator<char>() );
    std::cout << "v has " << v.size() << " bytes. ";
    v.push_back('\0');
    std::cout << "it holds \"" << &v[0] << "\"\n";
 
 
    // demonstration of the single-pass nature
    std::istringstream s("abc");
    std::istreambuf_iterator<char> i1(s), i2(s);
    std::cout << "i1 returns " << *i1 << '\n'
              << "i2 returns " << *i2 << '\n';
    ++i1;
    std::cout << "after incrementing i1, but not i2\n"
              << "i1 returns " << *i1 << '\n'
              << "i2 returns " << *i2 << '\n';
    ++i2; // this makes the apparent value of *i2 to jump from 'a' to 'c'
    std::cout << "after incrementing i2, but not i1\n"
              << "i1 returns " << *i1 << '\n'
              << "i2 returns " << *i2 << '\n';
 
}

Résultat :

v has 12 bytes. it holds "Hello, world"
i1 returns a
i2 returns a
after incrementing i1, but not i2
i1 returns b
i2 returns a
after incrementing i2, but not i1
i1 returns b
i2 returns c

[modifier] Voir aussi

itérateur de sortie qui écrit dans std::basic_streambuf
Original:
output iterator that writes to std::basic_streambuf
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(classe générique) [edit]
itérateur d'entrée qui lit std::basic_istream
Original:
input iterator that reads from std::basic_istream
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(classe générique) [edit]