LANG.STRUCT.ICVMF : Inappropriate Comparison of Virtual Member Function

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C and C++

LANG.STRUCT.ICVMF : Inappropriate Comparison of Virtual Member Function

要旨

A pointer to a virtual member function is tested for equality with something other than nullptr.

The result of such a comparison is unspecified.

プロパティ

クラス名

Inappropriate Comparison of Virtual Member Function

日本語クラス名

Inappropriate Comparison of Virtual Member Function

クラス分類

信頼性 (reliability)

ニーモニック

LANG.STRUCT.ICVMF

カテゴリー

AUTOSARC++14	AUTOSARC++14:A5-10-1	A pointer to member virtual function shall only be tested for equality with null-pointer-constant.
MisraC++2023	MisraC++2023:13.3.4	A comparison of a potentially virtual pointer to member shall only be with nullptr
CWE	CWE:758	Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
JSF++	JSF++:97.1	Neither operand of an equality operator (== or !=) shall be a pointer to a virtual member function.

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 Comparison of Virtual Member Function"

注：非正規化された AST を継続して使用した場合、使用ディスク容量が増加し解析時間が長くなる可能性があります。

例

class A {
  public:
    void f1(void);
    void f2(void);
    virtual void f3(void);
};

extern bool b1, b2;

void inappropriate_comparison(void) {
    b1 = &A::f2 == &A::f3; // 'Inappropriate Comparison of Virtual Member Function' warning issued here
}

void ok_comparisons(void) {
    b1 = &A::f1 != &A::f2;           // ok: both are non-virtual
    b2 = &A::f3 == nullptr;          // ok: comparison with nullptr
}

LANG.STRUCT.ICVMF : Inappropriate Comparison of Virtual Member Function

要旨

プロパティ

例

関連のある設定ファイルパラメータ