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assert

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< cpp‎ | error

 
 
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Assertions
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assert
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Defined in header <cassert>
#ifdef NDEBUG

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

#endif
A definição da macro assert depende de outra macro, NDEBUG, a qual não é definida pela biblioteca padrão.
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 é definido como um nome de macro no ponto em que o código-fonte <cassert> é incluída, então não faz nada assert.
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 não está definido, em seguida, verifica assert se seu argumento (que deve ser do tipo escalar) compara igual a zero. Se isso acontecer, assert saídas aplicação específica informações de diagnóstico sobre a saída de erro padrão e chama std::abort. A informação de diagnóstico é necessária de modo a incluir o texto de expression, bem como os valores das macros standard __FILE__, __LINE__ eo __func__ variável padrão.
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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Índice

[editar] Parâmetros

condition -
expressão do tipo escalar
Original:
expression of scalar type
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[editar] Valor de retorno

(Nenhum)
Original:
(none)
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[editar] Exemplo

#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

[editar] Veja também

afirmação estática
realiza em tempo de compilação afirmação verificando (a partir do C++ 11)
Original:
performs compile-time assertion checking (a partir do C++ 11)
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[edit]
provoca finalização anormal do programa (sem limpeza)
Original:
causes abnormal program termination (without cleaning up)
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(função) [edit]