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setjmp

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< cpp‎ | utility‎ | program

 
 
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initializer_list(C++11)
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Relational operators
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Pairs and tuples
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Swap, forward and move
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Communicating with the environment
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Não-locais saltos
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Non-local jumps
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setjmp
longjmp
Tipos
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Types
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jmp_buf
 
Defined in header <csetjmp>
#define setjmp(env) /* implementation-defined */
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.
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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.
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Índice

[editar] Parâmetros

env -
variável para guardar o estado de execução do programa a .
Original:
variable to save the execution state of the program to.
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[editar] Valor de retorno

0 se a macro foi chamado pelo código original e o contexto de execução foi salvo env.
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0 if the macro was called by the original code and the execution context was saved to env.
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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.
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[editar] 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
    }
}

Output:

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

[editar] Veja também

salta para local especificado
Original:
jumps to specified location
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(função) [edit]
C documentation for setjmp