operator>><div class="t-tr-text">(Std :: basic_istream)<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::basic_istream)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>
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<metanoindex/>
<tbody> </tbody> template< class CharT, class Traits > basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>& st, CharT& ch ); template< class Traits > basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, signed char& ch ); template< class Traits > basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, unsigned char& ch ); |
(1) | |
template< class CharT, class Traits> basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>& st, CharT* s ); template< class Traits > basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, signed char* s ); template< class Traits > basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, unsigned char* s ); |
(2) | |
template< class CharT, class Traits, class T > basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>&& st, T& value ); |
(3) | (desde C++11) |
Executa operações de entrada de caracteres.
Original:
Performs character input operations.
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1)
Extrai um personagem e guarda-a para
ch.Original:
Extracts a character and stores it to
ch.The text has been machine-translated via Google Translate.
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2)
Extrai os caracteres sucessivos e armazena-os em locais sucessivos de uma matriz de caracteres cujo primeiro elemento é apontado por
s. A extração pára se uma das seguintes condições:Original:
Extracts successive characters and stores them at successive locations of a character array whose first element is pointed to by
s. The extraction stops if one of the following conditions are met:The text has been machine-translated via Google Translate.
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- um carácter em branco (como determinado pela faceta ctype<CharT>) é encontrado. O personagem espaços em branco não é extraído.Original:a whitespace character (as determined by the ctype<CharT> facet) is found. The whitespace character is not extracted.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. this->width() - 1personagens são extraídosOriginal:this->width() - 1characters are extractedThe text has been machine-translated via Google Translate.
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Em ambos os casos, um adicional de valor nulo
CharT() caracteres é armazenado no fim da saída.Original:
In either case, an additional null character value
CharT() is stored at the end of the output.The text has been machine-translated via Google Translate.
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3)
Chama o operador de extração adequado, dada uma referência a um objeto rvalue fluxo de entrada (equivalente a
st >> value).Original:
Calls the appropriate extraction operator, given an rvalue reference to an input stream object (equivalent to
st >> value).The text has been machine-translated via Google Translate.
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Notas
As versões (1-2) do operador de comportar-se como funções de entrada formatados. Isto é, construir um objeto
sentry no início que libera o empate () 'd buffers, se necessário, verifica os erros e extratos e descarta todos os caracteres espaço em branco, a menos que o ios_base :: bandeira skipws foi desmarcada. A entrada é tentada apenas se o objecto sentry retorna true.Original:
The (1-2) versions of the operator behave as formatted input functions. That is, they construct a
sentry object at the beginning that flushes the tie()'d buffers if needed, checks for errors, and extracts and discards all leading whitespace characters unless the ios_base::skipws flag was cleared. The input is attempted only if the sentry object returns true.The text has been machine-translated via Google Translate.
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Parâmetros
| st | - | fluxo de entrada para extrair os dados a partir de
Original: input stream to extract the data from The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| ch | - | referência a um personagem para armazenar o personagem extraído
Original: reference to a character to store the extracted character to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| s | - | ponteiro para uma cadeia de caracteres para armazenar os caracteres extraído
Original: pointer to a character string to store the extracted characters to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Valor de retorno
st
Exemplo
#include <iostream>
#include <iomanip>
#include <sstream>
int main()
{
std::string input = "n greetings";
std::istringstream stream(input);
char c;
const int MAX = 6;
char cstr[MAX];
stream >> c >> std::setw(MAX) >> cstr;
std::cout << "c = " << c << '\n'
<< "cstr = " << cstr << '\n';
double f;
std::istringstream("1.23") >> f; // rvalue stream extraction
std::cout << "f = " << f << '\n';
}
Saída:
c = n
cstr = greet
f = 1.23
Veja também
extratos dados formatados Original: extracts formatted data 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) | |