std::ostream_iterator - cppreference.com

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Definido no cabeçalho `<iterator>`

`template< class T, class CharT = char, class Traits = std::char_traits<charT>> class ostream_iterator : public std::iterator<std::output_iterator_tag, void, void, void, void>`

std::ostream_iterator é um iterador de saída de uma única passagem que escreve objetos sucessivos de T tipo no objeto std::basic_ostream para o qual foi construído, utilizando operator<<. Delimitador de cadeia opcional é escrito para o fluxo de saída após cada operação de gravação. A operação de escrita é realizada quando o iterador (se dereferenced ou não) é atribuído. Incrementando a std::ostream_iterator é um não-op.

Original:

std::ostream_iterator is a single-pass output iterator that writes successive objects of type T into the std::basic_ostream object for which it was constructed, using operator<<. Optional delimiter string is written to the output stream after every write operation. The write operation is performed when the iterator (whether dereferenced or not) is assigned to. Incrementing the std::ostream_iterator is a no-op.

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Em uma implementação típica, os membros de dados apenas de std::ostream_iterator são um ponteiro para a std::basic_ostream associado e um ponteiro para o primeiro caractere na string delimitador.

Original:

In a typical implementation, the only data members of std::ostream_iterator are a pointer to the associated std::basic_ostream and a pointer to the first character in the delimiter string.

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Ao escrever caracteres, std::ostreambuf_iterator é mais eficiente, uma vez que evita a sobrecarga de construção e destruindo o objeto sentinela uma vez por personagem.

Original:

When writing characters, std::ostreambuf_iterator is more efficient, since it avoids the overhead of constructing and destructing the sentry object once per character.

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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`

`ostream_type`	`std::basic_ostream<CharT, Traits>`

Funções de membro


(constructor)	constrói um novo ostream_iterator Original: constructs a new ostream_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)	destrói um ostream_iterator Original: destructs an ostream_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)

operator=	escreve um objeto para a seqüência de saída associada Original: writes a object to the associated output sequence 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*	no-op (função pública membro)

operator++ operator++(int)	no-op (função pública membro)

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`	`void`

`difference_type`	`void`

`pointer`	`void`

`reference`	`void`

`iterator_category`	`std::output_iterator_tag`

Exemplo

#include <iostream>
#include <sstream>
#include <iterator>
#include <algorithm>
int main()
{
    std::istringstream str("0.1 0.2 0.3 0.4");
    std::partial_sum( std::istream_iterator<double>(str),
                      std::istream_iterator<double>(),
                      std::ostream_iterator<double>(std::cout, " "));
}

Saída:

Veja também


	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) [edit]

	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) [edit]