Fix #10427 Regression: selfInitialization (#4070)

Author: chrchr-github

lib/checkclass.cpp

@@ -2504,8 +2504,16 @@ void CheckClass::checkSelfInitialization()
             continue;
 
         for (; tok != scope->bodyStart; tok = tok->next()) {
-            if (Token::Match(tok, "[:,] %var% (|{ %var% )|}") && tok->next()->varId() == tok->tokAt(3)->varId()) {
-                selfInitializationError(tok, tok->strAt(1));
+            if (Token::Match(tok, "[:,] %var% (|{")) {
+                const Token* varTok = tok->next();
+                if (Token::Match(varTok->astParent(), "(|{")) {
+                    if (const Token* initTok = varTok->astParent()->astOperand2()) {
+                        if (initTok->varId() == varTok->varId())
+                            selfInitializationError(tok, varTok->str());
+                        else if (initTok->isCast() && ((initTok->astOperand1() && initTok->astOperand1()->varId() == varTok->varId()) || (initTok->astOperand2() && initTok->astOperand2()->varId() == varTok->varId())))
+                            selfInitializationError(tok, varTok->str());
+                    }
+                }
             }
         }
     }

test/testclass.cpp

@@ -7186,6 +7186,22 @@ class TestClass : public TestFixture {
                                 "}");
         ASSERT_EQUALS("[test.cpp:5]: (error) Member variable 'i' is initialized by itself.\n", errout.str());
 
+        checkSelfInitialization("class A {\n" // #10427
+                                "public:\n"
+                                "    explicit A(int x) : _x(static_cast<int>(_x)) {}\n"
+                                "private:\n"
+                                "    int _x;\n"
+                                "};\n");
+        ASSERT_EQUALS("[test.cpp:3]: (error) Member variable '_x' is initialized by itself.\n", errout.str());
+
+        checkSelfInitialization("class A {\n"
+                                "public:\n"
+                                "    explicit A(int x) : _x((int)(_x)) {}\n"
+                                "private:\n"
+                                "    int _x;\n"
+                                "};\n");
+        ASSERT_EQUALS("[test.cpp:3]: (error) Member variable '_x' is initialized by itself.\n", errout.str());
+
         checkSelfInitialization("class Fred {\n"
                                 "    std::string s;\n"
                                 "    Fred() : s(s) {\n"