Bug 357293

Description Dominik äger 2011-09-09 18:35:00 EDT

The following minimal example gives a semantic error but compiles just fine using gcc (see code comments for the location of the error):

class A
{
public:
  void f() { }
};

template <class T>
class B : public A
{
public:
  using A::f; // This seems to be ignored but should put A::f() in the scope of class B where it can be overloaded by A::f(int) instead of being hidden.
  void f(int) { }
};

int main(int, char**)
{
  B<float> obj_B;
  obj_B.f(3);
  obj_B.f(); // Wrong problem marker: Invalid arguments ' Candidates are: void f(int) '
  return 0;
}

This doesn't occur in the following example, where class B is not a template:

class A
{
public:
  void f() { }
};

class B : A // Not a template.
{
public:
  using A::f;
  void f(int) { }
};

int main(int, char**)
{
  B obj_B;
  obj_B.f(3);
  obj_B.f(); // No problem marker here.
  return 0;
}

The using declaration is supposed to prevent B::f(int) from hiding A::f() but overloading it instead. This concept is also described here:
http://publib.boulder.ibm.com/infocenter/comphelp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8a.doc%2Flanguage%2Fref%2Foverload_member_fn_base_derived.htm
and discussed here:
http://stackoverflow.com/questions/3202234/overloaded-functions-are-hidden-in-derived-class

The problem also occurs in more complex examples where the derived class extends a class template or there is a chain of inheritance of several classes.
I make heavy use of such function overloads in a template library and because those problem markers show up at every call to one of those functions, the whole project is littered with them although it compiles and runs fine. I would really appreciate if this one could be fixed.

I used the newest Eclipse (Windows 32 Bit) release from the eclipse.org download site:

Eclipse IDE for C/C++ Developers
Version: Indigo Release
Build id: 20110615-0604

Eclipse C/C++ Development Tools
Version: 8.0.0.201106081058
Build id: 201106081058

Windows 7 Professional (64 bit) Service Pack 1
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 4000+  2.10 GHz
Installed memory (RAM): 2,00 GB

The .log is attached for details.

java full version "1.7.0-b147"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode, sharing)