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A C generic selection expression has a controlling expression whose essential type that differs from its standard type (that is, its type according to the C standard).
Exception: a warning of this class is not triggered when the controlling expression is an integer constant expression that is neither a character constant nor of essentially Boolean type.
| クラス名 | Inappropriate Selection Type in C Generic | ||||||
|---|---|---|---|---|---|---|---|
| 日本語クラス名 | Inappropriate Selection Type in C Generic | ||||||
| クラス分類 | スタイル (style) | ||||||
| ニーモニック | LANG.TYPE.CGEN.IST | ||||||
| カテゴリー |
|
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| 対応言語 | C のみ利用可能です。 C++ は利用できません。 |
||||||
| 有効/無効設定 | このワーニングクラスのチェックはデフォルトで無効になっており、プロジェクトには非正規の C向けAST
が必要になります。有効にするにはプロジェクト設定ファイル （configuration file） に以下の WARNING_FILTER ルールと
RETAIN_UNNORMALIZED_C_AST 設定を追加してください。
RETAIN_UNNORMALIZED_C_AST = Yes WARNING_FILTER += allow class="Inappropriate Selection Type in C Generic" |
English (en)
int lang_type_cgen_ist(int x){
short s16 = 0;
int rv = 0;
rv += _Generic(s16 + s16, /* 'Inappropriate Selection Type in C Generic' warning issued here.
* - Under C standard, the type of (s16+s16) is signed int.
* - Essential type (per MISRA C 2012) is signed short.
*/
short:0,
default:1);
rv += _Generic(s16, /* ok: standard type == essential type == signed short */
short:0,
default:1);
rv += _Generic(20, /* ok: standard type != essential type (signed int vs signed short),
* but integer constant is an explicit exception case.
*/
short:0,
default:1);
return rv;
}
設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。