Namespace
Varianti

errno

Da cppreference.com.
< cpp‎ | error

 
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
La gestione degli errori
Gestione delle eccezioni
Original:
Exception handling
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exception
uncaught_exception
exception_ptr(C++11)
make_exception_ptr(C++11)
current_exception(C++11)
rethrow_exception(C++11)
nested_exception(C++11)
throw_with_nested(C++11)
rethrow_if_nested(C++11)
Gestione delle eccezioni fallimenti
Original:
Exception handling failures
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terminate
terminate_handler
get_terminate(C++11)
set_terminate
unexpected(deprecato)
bad_exception
unexpected_handler(deprecato)
get_unexpected(C++11)(deprecato)
set_unexpected(deprecato)
Eccezione categorie
Original:
Exception categories
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logic_error
invalid_argument
domain_error
length_error
out_of_range
runtime_error
range_error
overflow_error
underflow_error
Codici di errore
Original:
Error codes
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Codici di errore
errno
Asserzioni
Original:
Assertions
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assert
impianto system_error
Original:
system_error facility
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error_category(C++11)
generic_category(C++11)
system_category(C++11)
error_condition(C++11)
errc(C++11)
error_code(C++11)
system_error(C++11)
 
Defined in header <cerrno>
#define errno /*implementation-defined*/
errno è una macro di preprocessore che si espande a un static(C fino + 11) / thread-local(dal C++11) modificabile lvalue di int tipo. Diverse funzioni della libreria standard di indicare gli errori di scrittura di numeri interi positivi a errno. In genere, il valore di errno è impostato su uno dei codici di errore, di cui <cerrno> come costanti macro che iniziano con la lettera E, seguita da lettere maiuscole o cifre.
Original:
errno is a preprocessor macro that expands to a static(C fino + 11) / thread-local(dal C++11) modifiable lvalue of type int. Several standard library functions indicate errors by writing positive integers to errno. Typically, the value of errno is set to one of the error codes, listed in <cerrno> as macro constants that begin with the letter E, followed by uppercase letters or digits.
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Il valore di errno è 0 all'avvio del programma, e anche se le funzioni di libreria sono autorizzati a scrivere numeri interi positivi a errno o meno un errore, non funzioni di libreria memorizzare 0 in errno.
Original:
The value of errno is 0 at program startup, and although library functions are allowed to write positive integers to errno whether or not an error occurred, library functions never store 0 in errno.
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[modifica] Esempio

[edit]
#include <iostream>
#include <cmath>
#include <cerrno>
#include <cstring>
 
int main()
{
    double not_a_number = std::log(-1.0);
    if (errno == EDOM) {
        std::cout << "log(-1) failed: " << std::strerror(errno) << '\n';
    }
}

Output:

log(-1) failed: Numerical argument out of domain

[modifica] Vedi anche

macro per standard POSIX compatibili con le condizioni di errore
Original:
macros for standard POSIX-compatible error conditions
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(macro costante) [edit]
visualizza una stringa di caratteri del corrispondente errore di corrente stderr
Original:
displays a character string corresponding of the current error to stderr
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(funzione) [edit]
restituisce una versione di testo di un codice di errore visualizzato
Original:
returns a text version of a given error code
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(funzione) [edit]