std::istreambuf_iterator

 

C++

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Biblioteca Iterator

Primitivas iterador 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
Adaptadores de iterador 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
move_iterator (C++11) back_insert_iterator front_insert_iterator insert_iterator	make_move_iterator (C++11) back_inserter front_inserter inserter
Iteradores fluxo 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
Operações iterador 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)
Variar de acesso 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)

 

std::istreambuf_iterator

Funções de membro Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istreambuf_iterator::istreambuf_iterator

istreambuf_iterator::operator* istreambuf_iterator::operator-> (C++11)

istreambuf_iterator::operator++ istreambuf_iterator::operator++(int)

istreambuf_iterator::equal

Não-membros funções Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 é um iterador de entrada de passagem única, que lê os caracteres sucessivos a partir do objecto std::basic_streambuf para o qual foi construído. A operação de leitura actual é executada quando o iterador é incrementado, e não quando é dereferenced. O primeiro caractere pode ser lido quando o iterador é construído ou quando o dereferencing primeiro é feito. Caso contrário, dereferencing só retorna uma cópia do personagem mais recentemente li.

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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O padrão construído std::istreambuf_iterator é conhecido como o fim-de-fluxo iterador. Quando um std::istreambuf_iterator válido atinge o final do fluxo de base, torna-se igual ao iterador fim-de-fluxo. Dereferencing ou incrementá-lo ainda mais invoca comportamento 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 tem um construtor de cópia trivial, um construtor padrão constexpr, e um destruidor trivial.

Original:

std::istreambuf_iterator has a trivial copy constructor, a constexpr default constructor, and a trivial destructor.

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Tipos de membro

Tipo de membro 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
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>

Funções de membro

(constructor)	constrói um novo istreambuf_iterator Original: constructs a new istreambuf_iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro)
(destructor) (declarada implicitamente)	destructs an istreambuf_iterator (função pública membro)
operator* operator-> (a partir do C++ 11)	obtém uma cópia do atual character accesses um membro do personagem atual, se CharT tem membros Original: obtains a copy of the current character accesses a member of the current character, if CharT has members The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro)
operator++ operator++(int)	avança a istreambuf_iterator Original: advances the istreambuf_iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro)
equal	se ambos os testes são istreambuf_iterators fim-de-stream ou se ambos são válidos Original: tests if both istreambuf_iterators are end-of-stream or if both are valid The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro)

Não-membros funções

operator== operator!=	compara dois istreambuf_iterators Original: compares two istreambuf_iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função)

Inherited from std::iterator

Member types

Tipo de membro 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
value_type	CharT
difference_type	Traits::off_type
pointer	/* unspecified, usually CharT* */
reference	CharT
iterator_category	std::input_iterator_tag

Exemplo

#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

Veja também

ostreambuf_iterator	iterador de saída que escreve para std::basic_streambuf Original: output iterator that writes to std::basic_streambuf The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe)
istream_iterator	iterador de entrada que lê std::basic_istream Original: input iterator that reads from std::basic_istream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de classe)