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setjmp

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< cpp‎ | utility‎ | program

 
 
 
Das Programm unterstützt Versorgungsunternehmen
Beendigung des Programms
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Program termination
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abort
exit
quick_exit(C++11)
_Exit(C++11)
Die Kommunikation mit der Umwelt
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Communicating with the environment
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Signale
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Signals
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Signal-Typen
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Signal types
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SIGABRT
SIGFPE
SIGILL
SIGINT
SIGSEGV
SIGTERM
Nicht-lokale Sprünge
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Non-local jumps
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setjmp
longjmp
Types
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Types
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jmp_buf
 
Defined in header <csetjmp>
#define setjmp(env) /* implementation-defined */
Speichert die aktuelle Ausführungskontext in eine Variable env vom Typ std::jmp_buf. Diese Variable kann später verwendet, um die aktuelle Ausführung Kontext std::longjmp Funktion wiederherzustellen. Das heißt, wenn ein Anruf an std::longjmp Funktion gemacht wird, geht die Ausführung zum bestimmten Anruf Website, die die variable std::jmp_buf übergebenen std::longjmp konstruiert. In diesem Fall setjmp kehrt tho übergebenen Wert 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.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

env -
Variable, um den Ausführungszustand des Programms zu retten .
Original:
variable to save the execution state of the program to.
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[Bearbeiten] Rückgabewert

0 wenn das Makro durch den ursprünglichen Code aufgerufen wurde und die Ausführung Kontext wurde env gespeichert .
Original:
0 if the macro was called by the original code and the execution context was saved to env.
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Nicht-Null-Wert, wenn ein Sprung nicht lokalen gerade ausgeführt wurde. Der Rückgabewert der gleiche wie für std::longjmp übergeben .
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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[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch

springt zum angegebenen Ort
Original:
jumps to specified location
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(Funktion) [edit]
C documentation for setjmp