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std::basic_filebuf::showmanyc

Da cppreference.com
< cpp‎ | io‎ | basic filebuf

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
Original:
Streams
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Abstrações
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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
Cordas I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
Original:
Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
Original:
Types
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streamoff
streamsize
fpos
Interface de categoria de erro
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_filebuf
Membro funções públicas
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 funções de membro
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
Não-membros funções
Original:
Non-member functions
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swap(std::basic_filebuf)(C++11)
 
protected:
virtual std::streamsize showmanyc()
Se implementado, retorna o número de caracteres da esquerda para ler o arquivo.
Original:
If implemented, returns the number of characters left to read from the file.
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Índice

[editar] Parâmetros

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

O número de caracteres disponíveis para leitura do arquivo, ou -1 se o fim do arquivo foi atingido.
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 função é opcional. Se não for implementada, esta função retorna 0 (desde a base std::basic_streambuf::showmanyc versão de classe é chamado)
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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Se implementada ou não, esta função é normalmente chamado pelo std::basic_streambuf::in_avail se a área está vazia 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] Exemplo

teste de implementação para ver se showmanyc () é implementado 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] Veja também

obtém o número de caracteres disponíveis imediatamente na área get
Original:
obtains the number of characters immediately available in the get area
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(of std::basic_streambuf função pública membro) [edit]
extrai blocos já disponíveis de caracteres
Original:
extracts already available blocks of characters
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(of std::basic_istream função pública membro) [edit]