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goto statement

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Sprache C++
Allgemeine Themen
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General topics
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Flusskontrolle
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Flow control
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Bedingte Ausfhrung Aussagen
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Conditional execution statements
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Iterationsanweisungen
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Iteration statements
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Gehe Aussagen
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Jump statements
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Funktionen
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Functions
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Funktion Erklrung
Lambda-Funktion Erklrung
Funktions-Template
inline-Spezifizierer
Exception-Spezifikationen (veraltet)
noexcept Spezifizierer (C++11)
Ausnahmen
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Exceptions
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Namespaces
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Namespaces
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Types
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Types
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decltype specifier (C++11)
Specifiers
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Specifiers
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cv Planer
Lagerdauer Planer
constexpr Spezifizierer (C++11)
auto Spezifizierer (C++11)
alignas Spezifizierer (C++11)
Initialisierung
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Initialization
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Literale
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Literals
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Expressions
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Expressions
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alternative Darstellungen
Utilities
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Utilities
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Types
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Types
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typedef declaration
Typ Aliasdeklaration (C++11)
Attribute (C++11)
Wirft
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Casts
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impliziten Konvertierungen
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
C-Stil und funktionale Besetzung
Speicherzuweisung
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Memory allocation
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Classes
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Classes
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Class-spezifische Funktion Eigenschaften
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Class-specific function properties
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explizit (C++11)
statisch
Besondere Member-Funktionen
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Special member functions
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Templates
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Templates
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Klassen-Template
Funktions-Template
Template-Spezialisierung
Parameter Packs (C++11)
Verschiedenes
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Miscellaneous
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Inline Montage
 
Transfers Steuerung zu einem neuen Standort .
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Transfers control to a new location.
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Verwendet werden, wenn es anders nicht mglich ist, die Kontrolle an der gewnschten Stelle mit herkmmlichen Konstruktionen zu bertragen .
Original:
Used when it is otherwise impossible to transfer control to the desired location using conventional constructs.
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Syntax

goto label

Erklrung

ist. Die goto-Anweisung bertrgt die Steuerung an die Stelle von label angegeben. Die goto-Anweisung muss sich in die gleiche Funktion wie der label Sie verweisen wollen. Wenn goto Anweisung bertrgt rckwrts steuern, werden alle Objekte, die noch nicht an der label initialisiert zerstrt. Es ist illegal, die Kontrolle nach vorne zu bertragen, wenn dies Initialisierung eines Objekts .
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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Keywords

goto

Beispiel

#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
}

Output:

10 d8 d6 d4 d2
(0;0) (0;1) (0;2) (1;0) (1;1) (1;2)
d

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