Namespace
Varianti

assert

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 <cassert>
#ifdef NDEBUG

#define assert(condition) ((void)0)
#else
#define assert(condition) /*implementation defined*/

#endif
La definizione del assert macro dipende un'altra macro, NDEBUG, che non è definito dalla libreria standard.
Original:
The definition of the macro assert depends on another macro, NDEBUG, which is not defined by the standard library.
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Se NDEBUG è definito come un nome di macro nel punto in cui il codice sorgente è incluso <cassert>, quindi assert non fa nulla.
Original:
If NDEBUG is defined as a macro name at the point in the source code where <cassert> is included, then assert does nothing.
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Se NDEBUG non è definito, i controlli di assert se il suo argomento (che deve avere tipo scalare) confronta uguale a zero. In caso affermativo, assert uscite attuazione specifiche informazioni di diagnostica sul standard error e chiama std::abort. Le informazioni di diagnostica è necessario includere il testo expression, così come i valori dei macro standard __FILE__, __LINE__, e la variabile __func__ standard.
Original:
If NDEBUG is not defined, then assert checks if its argument (which must have scalar type) compares equal to zero. If it does, assert outputs implementation-specific diagnostic information on the standard error output and calls std::abort. The diagnostic information is required to include the text of expression, as well as the values of the standard macros __FILE__, __LINE__, and the standard variable __func__.
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Indice

[modifica] Parametri

condition -
espressione di tipo scalare
Original:
expression of scalar type
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[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
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[modifica] Esempio

#include <iostream>
// uncomment to disable assert()
// #define NDEBUG
#include <cassert>
 
int main()
{
    assert(2+2==4);
    std::cout << "Execution continues past the first assert\n";
    assert(2+2==5);
    std::cout << "Execution continues past the second assert\n";
}

Output:

Execution continues past the first assert
test: test.cc:8: int main(): Assertion `2+2==5' failed.
Aborted

[modifica] Vedi anche

affermazione statico
esegue in fase di compilazione affermazione controllo (dal C++11)
Original:
performs compile-time assertion checking (dal C++11)
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[edit]
causa chiusura anomala del programma (senza pulizia)
Original:
causes abnormal program termination (without cleaning up)
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(funzione) [edit]