Add helper

Author: web-flow

lib/astutils.cpp

@@ -1022,6 +1022,11 @@ const Token* isInLoopCondition(const Token* tok)
     return Token::Match(top->previous(), "for|while (") ? top : nullptr;
 }
 
+bool isDesignatedInitializer(const Token* tok)
+{
+    return tok && tok->isUnaryOp(".");
+}
+
 /// If tok2 comes after tok1
 bool precedes(const Token * tok1, const Token * tok2)
 {

lib/astutils.h

@@ -265,6 +265,11 @@ bool isStructuredBindingVariable(const Variable* var);
 
 const Token* isInLoopCondition(const Token* tok);
 
+/**
+ * Is token the dot of a designated initializer?
+ */
+bool isDesignatedInitializer(const Token* tok);
+
 /**
  * Is token used as boolean, that is to say cast to a bool, or used as a condition in a if/while/for
  */

lib/checkautovariables.cpp

@@ -612,8 +612,8 @@ void CheckAutoVariables::checkVarLifetimeScope(const Token * start, const Token
                         if (tokvalue->exprId() == tok->exprId() && !(tok->variable() && tok->variable()->isArray()) &&
                             !astIsContainerView(tok->astParent()))
                             continue;
-                        if (tokvalue->str() == "=" && Token::simpleMatch(tokvalue->astOperand1(), ".") && !tokvalue->astOperand1()->astOperand2())
-                            tokvalue = tokvalue->astOperand2(); // designated initializer
+                        if (tokvalue->str() == "=" && isDesignatedInitializer(tokvalue->astOperand1()))
+                            tokvalue = tokvalue->astOperand2();
                         if ((tokvalue->variable() && !isEscapedReference(tokvalue->variable()) &&
                              isInScope(tokvalue->variable()->nameToken(), scope)) ||
                             isDeadTemporary(tokvalue, nullptr, mSettings->library)) {