Fix #11840 FP constStatement with template parameters on operator (#5258)

Author: chrchr-github

lib/tokenize.cpp

@@ -5250,7 +5250,8 @@ void Tokenizer::createLinks2()
         } else if (token->str() == "<" &&
                    ((token->previous() && (token->previous()->isTemplate() ||
                                            (token->previous()->isName() && !token->previous()->varId()) ||
-                                           (token->strAt(-1) == "]" && (!Token::Match(token->linkAt(-1)->previous(), "%name%|)") || token->linkAt(-1)->previous()->isKeyword())))) ||
+                                           (token->strAt(-1) == "]" && (!Token::Match(token->linkAt(-1)->previous(), "%name%|)") || token->linkAt(-1)->previous()->isKeyword())) ||
+                                           (token->strAt(-1) == ")" && token->linkAt(-1)->strAt(-1) == "operator"))) ||
                     Token::Match(token->next(), ">|>>"))) {
             type.push(token);
             if (token->previous()->str() == "template")

test/testtokenize.cpp

@@ -3531,6 +3531,25 @@ class TestTokenizer : public TestFixture {
             ASSERT_EQUALS(true, tok1->link() == tok2);
             ASSERT_EQUALS(true, tok2->link() == tok1);
         }
+
+        {
+            const char code[] = "struct S {\n" // #11840
+                                "    template<typename T, typename U>\n"
+                                "    void operator() (int);\n"
+                                "};\n"
+                                "void f() {\n"
+                                "    S s;\n"
+                                "    s.operator()<int, int>(1);\n"
+                                "}\n";
+            errout.str("");
+            Tokenizer tokenizer(&settings0, this);
+            std::istringstream istr(code);
+            ASSERT(tokenizer.tokenize(istr, "test.cpp"));
+            const Token* tok1 = Token::findsimplematch(tokenizer.tokens(), "< int");
+            const Token* tok2 = Token::findsimplematch(tok1, "> (");
+            ASSERT_EQUALS(true, tok1->link() == tok2);
+            ASSERT_EQUALS(true, tok2->link() == tok1);
+        }
     }
 
     void simplifyString() {