Add support for simplifying user defined literal operator. (#1827)

lib/tokenize.cpp

@@ -10543,6 +10543,11 @@ void Tokenizer::simplifyOperatorName()
                 op += ")";
                 par = par->next();
                 done = false;
+            } else if (Token::Match(par, "\"\" %name% (")) {
+                op += "\"\"";
+                op += par->strAt(1);
+                par = par->tokAt(2);
+                done = true;
             }
         }
 

test/testtokenize.cpp

@@ -398,6 +398,7 @@ private:
         TEST_CASE(simplifyOperatorName10); // #8746 - using a::operator=
         TEST_CASE(simplifyOperatorName11); // #8889
         TEST_CASE(simplifyOperatorName12); // #9110
+        TEST_CASE(simplifyOperatorName13); // user defined literal
 
         TEST_CASE(simplifyNullArray);
 
@@ -6227,6 +6228,12 @@ private:
                       tokenizeAndStringify(code));
     }
 
+    void simplifyOperatorName13() { // user defined literal
+        const char code[] = "unsigned long operator""_numch(const char *ch, unsigned long size);";
+        ASSERT_EQUALS("unsigned long operator""_numch ( const char * ch , unsigned long size ) ;",
+                      tokenizeAndStringify(code));
+    }
+
     void simplifyNullArray() {
         ASSERT_EQUALS("* ( foo . bar [ 5 ] ) = x ;", tokenizeAndStringify("0[foo.bar[5]] = x;"));
     }