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std::basic_istream::sentry

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< cpp‎ | io‎ | basic istream

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
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Buffers
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(obsoleto)
Arroyos
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Streams
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Abstracciones
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Abstractions
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File I / O
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File I/O
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Cadena de I / O
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String I/O
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Matriz I / O
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Array I/O
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(obsoleto)
(obsoleto)
(obsoleto)
Tipos
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Types
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Error interfaz categoría
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Error category interface
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(C++11)
 
std::basic_istream
Los objetos globales
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Global objects
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Las funciones miembro
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Member functions
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Entrada con formato
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Formatted input
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Entrada sin formato
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Unformatted input
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Posicionamiento
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Positioning
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Varios
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Miscellaneous
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Clases de miembros
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Member classes
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basic_istream::sentry
Terceros funciones
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Non-member functions
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basic_istream::sentry
Funciones
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Functions
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Definido en la cabecera <istream>
template< class CharT, class Traits = std::char_traits<CharT>>
class std::basic_istream<CharT, Traits>::sentry;

An object of class basic_istream::sentry is constructed in local scope at the beginning of each member function of std::basic_istream that performs input (both formatted and unformatted). Its constructor prepares the input stream: checks if the stream is already in a failed state, flushes the tie()'d output streams, skips leading whitespace if skipws flag is set, and performs other implementation-defined tasks if necessary. All cleanup, if necessary, is performed in the destructor, so that it is guaranteed to happen if exceptions are thrown during input.

Contenido

[editar] Tipos de miembros

traits_type Traits

[editar] Las funciones miembro

construye el centinela object.
All las tareas de preparación se llevan a cabo aquí
Original:
constructs the sentry object.
All the preparation tasks are done here
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(función miembro público) [editar]
finalizes the stream object after formatted input or after exception, if necessary
(función miembro público)
operator=
[eliminada]
No copie asignable
Original:
not copy assignable
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(función miembro público)
Verifica si la preparación del objeto de secuencia se realizó correctamente
Original:
checks if the preparation of the stream object was successful
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(función miembro público) [editar]

[editar] Ejemplo

#include <iostream>
#include <sstream>
 
struct Foo {
   char n[5];
};
std::istream& operator>>(std::istream& is, Foo& f)
{
    std::istream::sentry s(is);
    if(s)
        is.read(f.n, 5);
    return is;
}
 
int main()
{
    std::string input = "   abcde";
    std::istringstream stream(input);
    Foo f;
    stream >> f;
    std::cout.write(f.n, 5);
    std::cout << '\n';
}

Salida:

abcde


[editar] Ver también

extractos de formato de datos
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extracts formatted data
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(función miembro público) [editar]
extrae caracteres y arrays de caracteres
Original:
extracts characters and character arrays
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(plantilla de función) [editar]