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std::getline

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< cpp‎ | string‎ | basic string


 
 
Strings biblioteca
Terminadas en nulo
Original:
Null-terminated strings
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Cadenas de bytes
Multibyte cuerdas
Cadenas anchas
Clases
Original:
Classes
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std::basic_string
Las funciones miembro
Original:
Member functions
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Elemento acceso
Original:
Element access
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Los iteradores
Original:
Iterators
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Capacidad
Original:
Capacity
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Operaciones
Original:
Operations
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Buscar
Original:
Search
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Constantes
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Constants
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Terceros funciones
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Non-member functions
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getline
(C++11)(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)(C++11)
(C++11)
(C++11)
Clases de ayuda
Original:
Helper classes
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Definido en la cabecera <string>
template< class CharT, class Traits, class Allocator >

std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>& input,
                                           std::basic_string<CharT,Traits,Allocator>& str,

                                           CharT delim );
(1)
template< class CharT, class Traits, class Allocator >

std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>&& input,
                                           std::basic_string<CharT,Traits,Allocator>& str,

                                           CharT delim );
(1) (desde C++11)
template< class CharT, class Traits, class Allocator >

std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>& input,

                                           std::basic_string<CharT,Traits,Allocator>& str );
(2)
template< class CharT, class Traits, class Allocator >

std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>&& input,

                                           std::basic_string<CharT,Traits,Allocator>& str );
(2) (desde C++11)
getline lee los caracteres de una secuencia de entrada y los coloca en una cadena:
Original:
getline reads characters from an input stream and places them into a string:
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1)
Se comporta como UnformattedInputFunction, excepto que input.gcount() no se ve afectada. Después de la construcción y comprobación del objeto centinela, realiza lo siguiente:
Original:
Behaves as UnformattedInputFunction, except that input.gcount() is not affected. After constructing and checking the sentry object, performs the following:
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1)
Llamadas str.erase()
Original:
Calls str.erase()
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2)
Extrae caracteres de input y añade a ellos str hasta una de las siguientes situaciones (comprobado en el orden indicado)
Original:
Extracts characters from input and appends them to str until one of the following occurs (checked in the order listed)
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a)
al final de su archivo de estado en input, en cuyo caso, conjuntos getline eofbit y vuelve .
Original:
end-of-file condition on input, in which case, getline sets eofbit and returns.
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b)
el siguiente carácter de entrada disponible es delim, según pruebas realizadas por Traits::eq(c, delim), en cuyo caso se extrae el carácter delimitador de input, pero no se anexa a str .
Original:
the next available input character is delim, as tested by Traits::eq(c, delim), in which case the delimiter character is extracted from input, but is not appended to str.
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c)
str.max_size() personajes han sido almacenados, en cuyo caso getline conjuntos failbit y vuelve .
Original:
str.max_size() characters have been stored, in which case getline sets failbit and returns.
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3)
Si hay personajes fueron extraídos por la razón que sea (ni siquiera el delimitador descartado), getline conjuntos failbit y vuelve .
Original:
If no characters were extracted for whatever reason (not even the discarded delimiter), getline sets failbit and returns.
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2)
Igual que getline(input, str, input.widen(’\n’)), es decir, el delimitador predeterminado es el carácter de línea de fondo .
Original:
Same as getline(input, str, input.widen(’\n’)), that is, the default delimiter is the endline character.
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[editar] Parámetros

input -
la corriente para obtener los datos
Original:
the stream to get data from
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str -
la cadena para poner los datos en
Original:
the string to put the data into
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delim -
el carácter delimitador
Original:
the delimiter character
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[editar] Valor de retorno

input

[editar] Ejemplo

El código siguiente pregunta al usuario por su nombre, y luego saluda con ese nombre .
Original:
The following code asks the user for their name, then greets them using that name.
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#include <string>
#include <iostream>
 
int main()
{
    std::string name;
    std::cout << "What is your name? ";
    std::getline(std::cin, name);
    std::cout << "Hello " << name << ", nice to meet you.";
}

Posible salida:

What is your name? John Q. Public
Hello John Q. Public, nice to meet you.