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std::istreambuf_iterator

Da cppreference.com.
< cpp‎ | iterator

 
 
Biblioteca Iterator
Primitive iteratori
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
Adattatori iteratori
Original:
Iterator adaptors
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reverse_iterator
Flusso iteratori
Original:
Stream iterators
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istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Operazioni di iteratori
Original:
Iterator operations
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advance
distance
prev(C++11)
next(C++11)
Intervallo accesso
Original:
Range access
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begin(C++11)
end(C++11)
 
std::istreambuf_iterator
Membri funzioni
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
Non membri funzioni
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 è un passaggio singolo iteratore di input che legge i caratteri successivi dall'oggetto std::basic_streambuf per cui è stato costruito. L'operazione di lettura reale viene eseguita quando l'iteratore non viene incrementato, quando è dereferenziato. Il primo carattere può essere letto quando l'iteratore è costruito o quando la dereferenziazione primo fatto. In caso contrario, dereferenziare solo restituisce una copia del personaggio più letto di recente.
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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L'impostazione predefinita-costruito std::istreambuf_iterator è conosciuta come la fine flusso di iteratore. Quando un std::istreambuf_iterator valida raggiunge la fine del flusso sottostante, diventa uguale al fine flusso iteratore. Dereferenziazione o incrementarlo richiede ulteriori comportamento indefinito.
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 dispone di un costruttore di copia banale, un costruttore predefinito constexpr, e un distruttore banale.
Original:
std::istreambuf_iterator has a trivial copy constructor, a constexpr default constructor, and a trivial destructor.
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Indice

[modifica] Membri tipi

Membro tipo
Original:
Member type
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Definition
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>

[modifica] Membri funzioni

costruisce un nuovo istreambuf_iterator
Original:
constructs a new istreambuf_iterator
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(membro pubblico funzione)
(destructor)
(dichiarato in modo implicito)
destructs an istreambuf_iterator
(membro pubblico funzione)
ottiene una copia della corrente character
accesses un membro del carattere corrente, se CharT ha membri
Original:
obtains a copy of the current character
accesses a member of the current character, if CharT has members
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(membro pubblico funzione)
fa avanzare il istreambuf_iterator
Original:
advances the istreambuf_iterator
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(membro pubblico funzione)
test se entrambi istreambuf_iterators sono end-of-stream o se entrambi sono valide
Original:
tests if both istreambuf_iterators are end-of-stream or if both are valid
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(membro pubblico funzione)

[modifica] Non membri funzioni

confronta due istreambuf_iterators
Original:
compares two istreambuf_iterators
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(funzione di modello)

Inherited from std::iterator

Member types

Membro tipo
Original:
Member type
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Definition
value_type CharT
difference_type Traits::off_type
pointer /* unspecified, usually CharT* */
reference CharT
iterator_category std::input_iterator_tag

[modifica] Esempio

#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';
 
}

Output:

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

[modifica] Vedi anche

uscita iteratore che scrive std::basic_streambuf
Original:
output iterator that writes to std::basic_streambuf
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(classe template) [edit]
iteratore di input che legge da std::basic_istream
Original:
input iterator that reads from std::basic_istream
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(classe template) [edit]