issue #10404 Wrong type for overloaded template method in tagfile

Author: doxygen

src/doxygen.cpp

@@ -2579,6 +2579,14 @@ static int findFunctionPtr(const std::string &type,SrcLangExt lang, int *pLength
     i = match.position();
     l = match.length();
   }
+  if (i!=std::string::npos)
+  {
+    size_t di = type.find("decltype(");
+    if (di!=std::string::npos && di<i)
+    {
+      i = std::string::npos;
+    }
+  }
   size_t bb=type.find('<');
   size_t be=type.rfind('>');
   bool templFp = false;

src/scanner.l

@@ -5317,14 +5317,22 @@ NONLopt [^\n]*
                                           yyextra->current->fileName = yyextra->fileName;
                                           yyextra->current->startLine = yyextra->yyBegLineNr;
                                           yyextra->current->startColumn = yyextra->yyBegColNr;
-                                          static const reg::Ex re(R"(\([^)]*[*&][^)]*\))");
+                                          static const reg::Ex re(R"(\([^)]*[*&][^)]*\))"); // e.g. (...*...)
                                           reg::Match match;
                                           std::string type = yyextra->current->type.str();
                                           int ti=-1;
                                           if (reg::search(type,match,re))
                                           {
                                             ti = (int)match.position();
                                           }
+                                          if (ti!=-1)
+                                          {
+                                           int di = yyextra->current->type.find("decltype(");
+                                           if (di!=-1 && di<ti) // decltype(...(...*...) -> normal return type
+                                           {
+                                             ti=-1;
+                                           }
+                                          }
                                           int ts=yyextra->current->type.find('<');
                                           int te=yyextra->current->type.findRev('>');