goto statement
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Transferts de contrôle vers un nouvel emplacement .
Original:
Transfers control to a new location.
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Utilisé quand il en est autrement impossible de transférer le contrôle à l'endroit désiré en utilisant des constructions conventionnelles .
Original:
Used when it is otherwise impossible to transfer control to the desired location using conventional constructs.
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Sommaire |
[modifier] Syntaxe
goto label
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[modifier] Explication
L'instruction goto transfère le contrôle à l'emplacement spécifié par label. L'instruction goto doit être en la même fonction que la label il se réfère. Si les transferts instruction goto contrôle en arrière, tous les objets qui ne sont pas encore initialisées à la label sont détruites. Il est illégal de transférer vers l'avant contrôle si cela sauter l'initialisation d'un objet .
Original:
The goto statement transfers control to the location specified by label. The goto statement must be in the same function as the label it is referring. If goto statement transfers control backwards, all objects that are not yet initialized at the label are destructed. It is illegal to transfer control forwards if doing so would skip initialization of an object.
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[modifier] Mots-clés
[modifier] Exemple
#include <iostream> struct Object { ~Object() { std::cout << "d"; } }; int main() { int a = 10; //loop using goto label: Object obj; std::cout << a << " "; a = a - 2; if (a != 0) { goto label; //causes obj to be destructed } std::cout << '\n'; //get out of multi-level loop easily for (int x = 0; x < 3; x++) { for (int y = 0; y < 3; y++) { std::cout << "(" << x << ";" << y << ") " << '\n'; if (x + y >= 3) { goto endloop; } } } endloop: std::cout << '\n'; return 0; //causes obj to be destructed }
Résultat :
10 d8 d6 d4 d2 (0;0) (0;1) (0;2) (1;0) (1;1) (1;2) d