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goto statement

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一般的なトピック
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General topics
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フロー制御
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Flow control
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条件付き実行文
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Conditional execution statements
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繰り返し文
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Iteration statements
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文をジャンプします
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Jump statements
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goto statement
return statement
機能します
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Functions
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関数の宣言
ラムダ関数の宣言
関数テンプレート
の歴史。インライン指定
例外仕様 (廃止予定)
noexcept指定子 (C++11)
例外
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Exceptions
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名前空間
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Namespaces
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タイプ
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Types
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decltype specifier (C++11)
指定子
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Specifiers
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CV指定
貯蔵期間指定
constexprの指定子 (C++11)
自動指定 (C++11)
alignas指定子 (C++11)
初期化
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Initialization
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リテラル
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Literals
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Expressions
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代替表現
ユーティリティ
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Utilities
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タイプ
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Types
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typedef declaration
型の別名宣言 (C++11)
属性 (C++11)
キャストします
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Casts
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const_cast conversion
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Memory allocation
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クラス
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Classes
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クラス固有の機能特性
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Class-specific function properties
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明示 (C++11)
静的
特殊なメンバ関数
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Special member functions
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テンプレート
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Templates
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クラステンプレート
関数テンプレート
テンプレートの特殊化
パラメーターパック (C++11)
その他
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Miscellaneous
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インラインアセンブリ
 
新しい場所に制御を移し.
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Transfers control to a new location.
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それは、従来の構造体を使用して目的の場所に制御を移すことがそうでなければ不可能である場合に使用され.
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Used when it is otherwise impossible to transfer control to the desired location using conventional constructs.
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目次

[編集] 構文

goto label

[編集] 説明

goto文に制御を移しlabelで指定された場所へ。goto文は、でなければなりませんlabelそれと同じ機能を参照しています。goto文の転送は後方にコントロールしている場合、まだlabel時に初期化されていないすべてのオブジェクトが破棄されますそれは、そうすることは、オブジェクトの初期化.
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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[編集] キーワード

goto

[編集]

#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