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std::istreambuf_iterator

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< cpp‎ | iterator

 
 
Biblioteca Iterator
Primitivas iterador
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
Adaptadores iterador
Original:
Iterator adaptors
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reverse_iterator
Iteradores Stream
Original:
Stream iterators
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istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Operaciones iterador
Original:
Iterator operations
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advance
distance
prev(C++11)
next(C++11)
Rango de acceso
Original:
Range access
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begin(C++11)
end(C++11)
 
std::istreambuf_iterator
Las funciones miembro
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
Terceros funciones
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 es un iterador de entrada de un solo paso que lee los caracteres sucesivos desde el objeto std::basic_streambuf para la que fue construido. La operación de lectura real se realiza cuando el iterador no se incrementa, cuando se eliminan las referencias. El primer carácter puede ser leído cuando el iterador está construido o cuando la cancelación de referencia del primero que se hace. De lo contrario, desreferencia sólo devuelve una copia del personaje más leído recientemente .
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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El valor predeterminado construido std::istreambuf_iterator se conoce como el de fin de flujo iterador. Cuando un std::istreambuf_iterator válido alcanza el final de la secuencia subyacente, se hace igual a la iterador de final de secuencia. Desreferenciación o incrementarlo aún más invoca un comportamiento indefinido .
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 tiene un constructor copia trivial, un constructor predeterminado constexpr, y un destructor trivial .
Original:
std::istreambuf_iterator has a trivial copy constructor, a constexpr default constructor, and a trivial destructor.
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Contenido

[editar] Tipos de miembros

Miembro de 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>

[editar] Las funciones miembro

construye una nueva istreambuf_iterator
Original:
constructs a new istreambuf_iterator
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(miembro público función)
(destructor)
(implícitamente declarado)
destructs an istreambuf_iterator
(miembro público función)
obtiene una copia de la corriente character
accesses un miembro del carácter actual, si CharT tiene miembros
Original:
obtains a copy of the current character
accesses a member of the current character, if CharT has members
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(miembro público función)
avanza la istreambuf_iterator
Original:
advances the istreambuf_iterator
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(miembro público función)
si ambas pruebas son istreambuf_iterators final de corriente o si ambos son válidos
Original:
tests if both istreambuf_iterators are end-of-stream or if both are valid
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(miembro público función)

[editar] Terceros funciones

compara dos istreambuf_iterators
Original:
compares two istreambuf_iterators
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(función de plantilla)

Inherited from std::iterator

Member types

Miembro de 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

[editar] Ejemplo

#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

[editar] Ver también

salida iterador que escribe en std::basic_streambuf
Original:
output iterator that writes to std::basic_streambuf
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(clase de plantilla) [edit]
iterador de entrada que se lee de std::basic_istream
Original:
input iterator that reads from std::basic_istream
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(clase de plantilla) [edit]