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std::basic_ios::eof

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< cpp‎ | io‎ | basic ios

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
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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
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cordas I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
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Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
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Types
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streamoff
streamsize
fpos
Interface de categoria de erro
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_ios
Funções de membro
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Member functions
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basic_ios::basic_ios
basic_ios::~basic_ios
Funções do Estado
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State functions
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basic_ios::good
basic_ios::eof
basic_ios::fail
basic_ios::bad
basic_ios::operator!
basic_ios::operator bool
basic_ios::rdstate
basic_ios::setstate
basic_ios::clear
Formatação
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Formatting
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basic_ios::copyfmt
basic_ios::fill
Diversos
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Miscellaneous
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basic_ios::exceptions
basic_ios::imbue
basic_ios::rdbuf
basic_ios::tie
basic_ios::narrow
basic_ios::widen
Protegido funções de membro
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Protected member functions
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basic_ios::init
basic_ios::move
basic_ios::swap
basic_ios::set_rdbuf
 
bool eof() const;
Retorna true se o fluxo associado atingiu o fim-de-arquivo. Especificamente, os retornos true se eofbit é definido em rdstate().
Original:
Returns true if the associated stream has reached end-of-file. Specifically, returns true if eofbit is set in rdstate().
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Índice

[editar] Parâmetros

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

true se um fim-de-arquivo ocorreu, false outra forma.
Original:
true if an end-of-file has occurred, false otherwise.
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[editar] Notas

Esta função só informa o estado de fluxo conforme definido pela mais recente operação I / O, que não examina a fonte de dados associado. Por exemplo, se o mais recente de I / O era um get(), que retornou o último byte de um arquivo, eof() retornos false. A próxima get() não consegue ler qualquer coisa e define o eofbit. Só então retorna eof() true.
Original:
This function only reports the stream state as set by the most recent I/O operation, it does not examine the associated data source. For example, if the most recent I/O was a get(), which returned the last byte of a file, eof() returns false. The next get() fails to read anything and sets the eofbit. Only then eof() returns true.
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Em utilização normal, o processamento pára no fluxo de entrada de qualquer erro, e eof() fail() são então utilizados para distinguir entre as condições de erro diferentes.
Original:
In typical usage, input stream processing stops on any error; eof() and fail() are then used to distinguish between different error conditions.
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[editar] Exemplo

[edit]
#include <iostream>
#include <fstream>
#include <cstdlib>
int main()
{
    std::ifstream file("test.txt");
    if(!file)  // operator! is used here
    {  
        std::cout << "File opening failed\n";
        return EXIT_FAILURE;
    }
 
    // typical C++ I/O loop uses the return value of the I/O function
    // as the loop controlling condition, operator bool() is used here
    for(int n; file >> n; ) {
       std::cout << n << ' ';
    }
    std::cout << '\n';
 
    if (file.bad())
        std::cout << "I/O error while reading\n";
    else if (file.eof())
        std::cout << "End of file reached successfully\n";
    else if (file.fail())
        std::cout << "Non-integer data encountered\n";
}


[editar] Veja também

ios_base::iostate flags basic_ios accessors
eofbit failbit badbit good() fail() bad() eof() operator bool() operator!()
false false false true false false false true false
false false true false true true false false true
false true false false true false false false true
false true true false true true false false true
true false false false false false true true false
true false true false true true true false true
true true false false true false true false true
true true true false true true true false true
cheques para o fim-de-arquivo
Original:
checks for the end-of-file
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(função) [edit]