Fix #13317 FN constParameterReference when iterating over container member (danmar#7015)

Author: chrchr-github

lib/astutils.cpp

@@ -2680,8 +2680,9 @@ bool isVariableChanged(const Token *tok, int indirect, const Settings &settings,
             return false;
 
         const Token *ftok = tok2->astParent()->astOperand2();
-        if (astIsContainer(tok2->astParent()->astOperand1()) && vt && vt->container) {
-            const Library::Container* c = vt->container;
+        const Token* const ctok = tok2->str() == "." ? tok2->astOperand2() : tok2;
+        if (astIsContainer(ctok) && ctok->valueType() && ctok->valueType()->container) {
+            const Library::Container* c = ctok->valueType()->container;
             const Library::Container::Action action = c->getAction(ftok->str());
             if (contains({Library::Container::Action::INSERT,
                           Library::Container::Action::ERASE,

lib/valueflow.cpp

@@ -5549,7 +5549,7 @@ static void valueFlowLibraryFunction(Token* tok, const std::string& returnValue,
 }
 
 static void valueFlowSubFunction(const TokenList& tokenlist,
-                                 SymbolDatabase& symboldatabase,
+                                 const SymbolDatabase& symboldatabase,
                                  ErrorLogger& errorLogger,
                                  const Settings& settings)
 {

test/testother.cpp

@@ -3753,6 +3753,23 @@ class TestOther : public TestFixture {
               "    return g(a, s.x);\n"
               "}\n");
         ASSERT_EQUALS("", errout_str());
+
+        check("struct S { std::vector<int> v; };\n" // #13317
+              "struct T { S s; };\n"
+              "int f(S& s) {\n"
+              "    for (std::vector<int>::const_iterator it = s.v.cbegin(); it != s.v.cend(); ++it) {}\n"
+              "    return *s.v.cbegin();\n"
+              "}\n"
+              "int f(T& t) {\n"
+              "    return *t.s.v.cbegin();\n"
+              "}\n"
+              "int f(std::vector<int>& v) {\n"
+              "    return *v.cbegin();\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:3]: (style) Parameter 's' can be declared as reference to const\n"
+                      "[test.cpp:7]: (style) Parameter 't' can be declared as reference to const\n"
+                      "[test.cpp:10]: (style) Parameter 'v' can be declared as reference to const\n",
+                      errout_str());
     }
 
     void constParameterCallback() {