std::istreambuf_iterator
De cppreference.com
 [] |
This page has been machine-translated from the English version of the wiki using Google Translate.
The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here. |
![[]](https://upload.cppreference.com/mwiki/images/3/31/Imbox_notice.png){kind=link}
<metanoindex/>
<tbody> </tbody>| Definido no cabealho <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 um iterador de entrada de passagem nica, que l os caracteres sucessivos a partir do objecto std::basic_streambuf para o qual foi construdo. A operao de leitura actual executada quando o iterador incrementado, e no quando dereferenced. O primeiro caractere pode ser lido quando o iterador construdo ou quando o dereferencing primeiro feito. Caso contrrio, dereferencing s retorna uma cpia 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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
O padro construdo
std::istreambuf_iterator conhecido como o fim-de-fluxo iterador. Quando um std::istreambuf_iterator vlido atinge o final do fluxo de base, torna-se igual ao iterador fim-de-fluxo. Dereferencing ou increment-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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
std::istreambuf_iterator tem um construtor de cpia trivial, um construtor padro constexpr, e um destruidor trivial.Original:
std::istreambuf_iterator has a trivial copy constructor, a constexpr default constructor, and a trivial destructor.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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>
|
| Esta seo est incompleta Motivo: the proxy member type |
Funes de membro
constri 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. (funo pblica membro) | |
(destructor) (declarada implicitamente) |
destructs an istreambuf_iterator (funo pblica membro) |
(desde C++11) |
obtm uma cpia 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. (funo pblica membro) |
avana 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. (funo pblica membro) | |
se ambos os testes so istreambuf_iterators fim-de-stream ou se ambos so vlidos 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. (funo pblica membro) | |
No-membros funes
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 funo) | |
Herdado de 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';
}
Sada:
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 tambm
iterador de sada 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) | |
iterador de entrada que l 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) | |