setjmp
De cppreference.com
<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <csetjmp>
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#define setjmp(env) /* implementation-defined */ |
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Salva o contexto de execução atual em um
env variável de std::jmp_buf tipo. Esta variável pode ser usado posteriormente para restaurar o contexto de execução atual por função std::longjmp. Isto é, quando uma chamada de função std::longjmp é feito, a execução continua com o local de chamada especial, que a variável construída std::jmp_buf passado para std::longjmp. Nesse caso, os retornos setjmp valor tho passado para std::longjmp.Original:
Saves the current execution context into a variable
env of type std::jmp_buf. This variable can later be used to restore the current execution context by std::longjmp function. That is, when a call to std::longjmp function is made, the execution continues at the particular call site that constructed the std::jmp_buf variable passed to std::longjmp. In that case setjmp returns tho value passed to std::longjmp.The text has been machine-translated via Google Translate.
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Parâmetros
| env | - | variável para guardar o estado de execução do programa a .
Original: variable to save the execution state of the program to. 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
0 se a macro foi chamado pelo código original e o contexto de execução foi salvo env.Original:
0 if the macro was called by the original code and the execution context was saved to env.The text has been machine-translated via Google Translate.
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Valor diferente de zero se um salto não-local estava realizada. O valor de retorno no mesmo passado para std::longjmp.
Original:
Non-zero value if a non-local jump was just performed. The return value in the same as passed to std::longjmp.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Exemplo
#include <iostream>
#include <csetjmp>
std::jmp_buf jump_buffer;
[[noreturn]] void a(int count)
{
std::cout << "a(" << count << ") called\n";
std::longjmp(jump_buffer, count+1); // setjump() will return count+1
}
int main()
{
int count = setjmp(jump_buffer);
if (count != 9) {
a(count); // This will cause setjmp() to exit
}
}
Saída:
a(0) called
a(1) called
a(2) called
a(3) called
a(4) called
a(5) called
a(6) called
a(7) called
a(8) called