assert
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<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <cassert>
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#ifdef NDEBUG #define assert(condition) ((void)0) #else #define assert(condition) /*implementation defined*/ #endif |
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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.The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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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__.The text has been machine-translated via Google Translate.
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Parâmetros
| condition | - | expressão do tipo escalar
Original: expression of scalar type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Valor de retorno
(Nenhum)
Original:
(none)
The text has been machine-translated via Google Translate.
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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";
}
Saída:
Execution continues past the first assert
test: test.cc:8: int main(): Assertion `2+2==5' failed.
Aborted
Veja também
| afirmação estática | realiza em tempo de compilação afirmação verificando (desde C++11)
Original: performs compile-time assertion checking (desde C++11) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
provoca finalização anormal do programa (sem limpeza) Original: causes abnormal program termination (without cleaning up) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) | |