std::operator<<,>>

 

C++

Lenguaje

Cabeceras

Conceptos

Biblioteca de utilidades

Biblioteca de cadenas

Biblioteca de contenedores

Biblioteca de algoritmos

Biblioteca de iteradores

Biblioteca numérica

Biblioteca de entrada/salida

Biblioteca de localización

Biblioteca de expresiones regulares (C++11)

Biblioteca de operaciones atómicas (C++11)

Biblioteca de tareas/subprocesos (C++11)

 

Strings biblioteca

Terminadas en nulo Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Cadenas de bytes

Multibyte cuerdas

Cadenas anchas

Clases Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string

char_traits

 

std::basic_string

Las funciones miembro 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.

basic_string::basic_string

basic_string::operator=

basic_string::assign

basic_string::get_allocator

Elemento acceso Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::at

basic_string::operator[]

basic_string::front (C++11)

basic_string::back (C++11)

basic_string::data

basic_string::c_str

Los iteradores Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::begin basic_string::cbegin (C++11)

basic_string::end basic_string::cend (C++11)

basic_string::rbegin basic_string::crbegin (C++11)

basic_string::rend basic_string::crend (C++11)

Capacidad Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::empty

basic_string::size

basic_string::length

basic_string::max_size

basic_string::reserve

basic_string::capacity

basic_string::shrink_to_fit (C++11)

Operaciones Original: Operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::clear

basic_string::insert

basic_string::erase

basic_string::push_back

basic_string::pop_back (C++11)

basic_string::append

basic_string::operator+=

basic_string::compare

basic_string::replace

basic_string::substr

basic_string::copy

basic_string::resize

basic_string::swap

Buscar Original: Search The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::find

basic_string::rfind

basic_string::find_first_of

basic_string::find_first_not_of

basic_string::find_last_of

basic_string::find_last_not_of

Constantes Original: Constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::npos

Terceros funciones 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== operator!= operator< operator> operator<= operator>=

swap(std::basic_string)

operator<< operator>>

getline

stoi stol stoll (C++11) (C++11) (C++11)

stoul stoull (C++11) (C++11)

stof stod stold (C++11) (C++11) (C++11)

to_string (C++11)

to_wstring (C++11)

Clases de ayuda Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

hash<std::string> hash<std::wstring> hash<std::u32string> hash<std::u16string> (C++11)

 

Defined in header <string>
template <class CharT, class Traits, class Allocator> std::basic_ostream<CharT, Traits>&     operator<<(std::basic_ostream<CharT, Traits>& os,                const std::basic_string<CharT, Traits, Allocator>& str);	(1)
template <class CharT, class Traits, class Allocator> std::basic_istream<CharT, Traits>&     operator>>(std::basic_istream<CharT, Traits>& is,                std::basic_string<CharT, Traits, Allocator>& str);	(2)

1)

En primer lugar, construye un objeto std::basic_ostream::sentry, que vacía el empate () 'd corriente si es necesario y comprueba si hay errores. Si el objeto centinela vuelve false, sale inmediatamente .

Original:

First, constructs a std::basic_ostream::sentry object, which flushes the tie()'d stream if necessary and checks for errors. If the sentry object returns false, exits immediately.

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Después, si el objeto centinela vuelve true, determina el relleno de formato de salida en la misma manera que la etapa 3 de num_put::put() .

Original:

Afterwards, if the sentry object returns true, determines the output format padding in the same manner as stage 3 of num_put::put().

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Entonces almacena cada carácter de la secuencia resultante (el contenido de str más relleno) para el flujo de salida os como si se aplicase os.rdbuf()->sputn(seq, n), donde n=std::max(os.width(), str.size())

Original:

Then stores each character from the resulting sequence (the contents of str plus padding) to the output stream os as if by calling os.rdbuf()->sputn(seq, n), where n=std::max(os.width(), str.size())

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Finalmente, llama os.width(0) .

Original:

Finally, calls os.width(0).

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2)

En primer lugar, construye un objeto std::basic_istream::sentry, que vacía el empate () 'd corriente si es necesario, extractos y descarta todos los principales espacios en blanco a menos que la bandera ios_base::skipws estaba despejado, y comprueba si hay errores. Si el objeto centinela vuelve false, sale inmediatamente .

Original:

First, constructs a std::basic_istream::sentry object, which flushes the tie()'d stream if necessary, extracts and discards all leading whitespace characters unless the ios_base::skipws flag was cleared, and checks for errors. If the sentry object returns false, exits immediately.

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Después, si el objeto devuelve centinela true, borra str con str.erase()

Original:

Afterwards, if the sentry object returns true, clears str with str.erase()

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Luego lee los caracteres de is y añade a ellos str como por str.append(1, c), hasta que una de las condiciones siguientes sea verdadera:

Original:

Then reads characters from is and appends them to str as if by str.append(1, c), until one of the following conditions becomes true:

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• N caracteres son leídos, donde N es is.width() si is.width() > 0, de lo contrario es N str.max_size()

  Original:

  N characters are read, where N is is.width() if is.width() > 0, otherwise N is str.max_size()

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• la condición de fin de archivo se produce en la is corriente

  Original:

  the end-of-file condition occurs in the stream is

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• std::isspace(c,is.getloc()) es cierto para el siguiente carácter c en is (este espacio en blanco permanece en el flujo de entrada) .

  Original:

  std::isspace(c,is.getloc()) is true for the next character c in is (this whitespace character remains in the input stream).

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Si no hay ningún carácter extrajo std::ios::failbit se encuentra en is, que puede lanzar std::ios_base::failure .

Original:

If no characters are extracted then std::ios::failbit is set on is, which may throw std::ios_base::failure.

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Por último, pide os.width(0) y destruye el objeto std::basic_istream::sentry .

Original:

Finally, calls os.width(0) and destroys the std::basic_istream::sentry object.

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Excepciones

1)

puede arrojar std::ios_base::failure si se produce una excepción durante la salida .

Original:

may throw std::ios_base::failure if an exception is thrown during output.

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2)

puede arrojar std::ios_base::failure si no hay caracteres son extraídos de is (por ejemplo, la secuencia es al final del archivo, o se compone sólo de espacios en blanco), o si se produce una excepción durante la entrada .

Original:

may throw std::ios_base::failure if no characters are extracted from is (e.g the stream is at end of file, or consists of whitespace only), or if an exception is thrown during input.

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Parámetros

os	-	una corriente de salida de caracteres Original: a character output stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
is	-	una corriente de entrada de caracteres Original: a character input stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
str	-	la cadena que se inserta o se extrae Original: the string to be inserted or extracted 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

1) os

2) is

Ejemplo

#include <iostream>
#include <string>
 
int main()
{
    std::string greeting = "Hello, whirled!"
    std::cout << greeting << '\n';
}

Output:

Hello, whirled!