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std::basic_ios::operator!

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< cpp‎ | io‎ | basic ios

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
Original:
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_ios
Las funciones miembro
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Member functions
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Funciones del Estado
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State functions
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basic_ios::operator!
Formato
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Formatting
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Varios
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Miscellaneous
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Protegido funciones miembro
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Protected member functions
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bool operator!() const;
Devoluciones true si ha ocurrido un error en la secuencia asociada. En concreto, los rendimientos true si badbit o failbit se encuentra en rdstate() .
Original:
Returns true if an error has occurred on the associated stream. Specifically, returns true if badbit or failbit is set in rdstate().
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Contenido

[editar] Parámetros

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

true si ha ocurrido un error, por lo demás false .
Original:
true if an error has occurred, false otherwise.
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[editar] Ejemplo

[editar]
#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] Ver también

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