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std::basic_filebuf::is_open

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< cpp‎ | io‎ | basic filebuf

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
Original:
Buffers
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(obsoleto)
Arroyos
Original:
Streams
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Abstracciones
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Abstractions
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File I / O
Original:
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_filebuf
Las funciones públicas miembros
Original:
Public member functions
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basic_filebuf::is_open
Protegido funciones miembro
Original:
Protected member functions
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Terceros funciones
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Non-member functions
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bool is_open() const;
Devoluciones true si la llamada más reciente a open() éxito y no ha habido ninguna llamada a close() desde entonces .
Original:
Returns true if the most recent call to open() succeeded and there has been no call to close() since then.
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Contenido

[editar] Parámetros

(Ninguno)
Original:
(none)
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[editar] Valor de retorno

true si el archivo asociado está abierto, false de otra manera .
Original:
true if the associated file is open, false otherwise.
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[editar] Notas

Esta función se suele llamar por std::basic_fstream::is_open .
Original:
This function is typically called by std::basic_fstream::is_open.
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[editar] Ejemplo

#include <fstream>
#include <iostream>
 
int main()
{
    std::ifstream fs("test.txt");
    std::filebuf fb;
    fb.open("test.txt", std::ios_base::in);
    std::cout << std::boolalpha
              << "direct call: " << fb.is_open() << '\n'
              << "through streambuf: " << fs.rdbuf()->is_open() << '\n'
              << "through fstream: " << fs.is_open() << '\n';
}

Salida:

direct call: true
through streambuf: true
through fstream: true

[editar] Ver también

abre un archivo y lo configura como la secuencia de caracteres asociados
Original:
opens a file and configures it as the associated character sequence
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(función miembro público) [editar]
vacía el búfer área de poner y cierra el archivo asociado
Original:
flushes the put area buffer and closes the associated file
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(función miembro público) [editar]