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std::basic_filebuf::showmanyc

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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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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleto)
Arroyos
Original:
Streams
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Abstracciones
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cadena de I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz I / O
Original:
Array I/O
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istrstream(obsoleto)
ostrstream(obsoleto)
strstream(obsoleto)
Tipos
Original:
Types
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streamoff
streamsize
fpos
Error interfaz categoría
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_filebuf
Las funciones públicas miembros
Original:
Public member functions
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basic_filebuf::basic_filebuf
basic_filebuf::~basic_filebuf
basic_filebuf::operator=(C++11)
basic_filebuf::swap(C++11)
basic_filebuf::is_open
basic_filebuf::open
basic_filebuf::close
Protegido funciones miembro
Original:
Protected member functions
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basic_filebuf::showmanyc
basic_filebuf::underflow
basic_filebuf::uflow
basic_filebuf::pbackfail
basic_filebuf::overflow
basic_filebuf::setbuf
basic_filebuf::seekoff
basic_filebuf::seekpos
basic_filebuf::sync
basic_filebuf::imbue
Terceros funciones
Original:
Non-member functions
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swap(std::basic_filebuf)(C++11)
 
protected:
virtual std::streamsize showmanyc()
Si se aplica, devuelve el número de caracteres que quedan para leer desde el archivo .
Original:
If implemented, returns the number of characters left to read from the file.
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Contenido

[editar] Parámetros

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

El número de caracteres disponibles para su lectura desde el archivo, o -1 si al final del archivo se llegó .
Original:
The number of characters available for reading from the file, or -1 if the end of file was reached.
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[editar] Notas

Esta función es opcional. Si no se implementa, esta función devuelve 0 (desde la clase base std::basic_streambuf::showmanyc versión se llama)
Original:
This function is optional. If not implemented, this function returns 0 (since the base class version std::basic_streambuf::showmanyc gets called)
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Ya sea implementado o no, esta función se denomina normalmente por std::basic_streambuf::in_avail si el área está vacío .. get
Original:
Whether implemented or not, this function is normally called by std::basic_streambuf::in_avail if the get area is empty.
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[editar] Ejemplo

prueba de la aplicación para ver si showmanyc () se implementa para filebuf
Original:
implementation test to see if showmanyc() is implemented for filebuf
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#include <fstream>
#include <iostream>
 
struct mybuf : std::filebuf
{
     using std::filebuf::showmanyc;
};
 
int main()
{
    mybuf fin;
    fin.open("test.in", std::ios_base::in);
    std::cout << "showmanyc() returns " << fin.showmanyc() << '\n';
}

Output:

showmanyc() returns 6626

[editar] Ver también

obtiene el número de caracteres disponibles de inmediato en la zona get
Original:
obtains the number of characters immediately available in the get area
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(miembro público of std::basic_streambuf función) [edit]
extrae los bloques que ya están disponibles los personajes
Original:
extracts already available blocks of characters
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(miembro público of std::basic_istream función) [edit]