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Re: pointers to overloaded member functions

To: martin at mira dot isdn dot cs dot tu-berlin dot de
Subject: Re: pointers to overloaded member functions
From: Jonathan Hamaker <hamaker at ISIP dot MsState dot EDU>
Date: Mon, 11 Oct 1999 09:05:28 -0500 (CDT)
CC: gnu-gcc-bug at gnu dot org
Reply-to: hamaker at ISIP dot MsState dot EDU

Hi Martin, Thank you for your reply. My apologies for wasting your
time on the faulty test case before. Here is one that I have actually
tested and annotated with the errors that I consider to be against
standard C++ (perhaps I am misreading the standard). It involves the
use of pointers to overloads of member functions and templates.  I
hope that the test case below is more useful than the previous one.

Jon Hamaker
Institute for Signal and Information Processing
Mississippi State University
hamaker@isip.msstate.edu

------**  gcc options **--------

gcc -v --save-temps -o x.exe x.cc
Reading specs from /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/specs
gcc version 2.95.1 19990816 (release)
 /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/cpp -lang-c++ -v -D__GNUC__=2 -D__GNUG__=2 -D__GNUC_MINOR__=95 -D__cplusplus -Dunix -D__svr4__ -D__SVR4 -Dsun -D__unix__ -D__svr4__ -D__SVR4 -D__sun__ -D__unix -D__sun -Asystem(svr4) -D__EXCEPTIONS -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ x.cc x.ii
GNU CPP version 2.95.1 19990816 (release) (i386 System V Release 4)
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/../../../../include/g++-3
 /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/../../../../i386-pc-solaris2.6/include
 /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /usr/local/include
End of omitted list.
 /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/cc1plus x.ii -quiet -dumpbase x.cc -version -o x.s
GNU C++ version 2.95.1 19990816 (release) (i386-pc-solaris2.6) compiled by GNU C version 2.95.1 19990816 (release).
 /usr/ccs/bin/as -V -Qy -o x.o x.s
as: WorkShop Compilers 4.2 alpha 14 Jun 1996
 /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/collect2 -V -Y P,/usr/ccs/lib:/usr/lib -Qy -o x.exe /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/crt1.o /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/crti.o /usr/ccs/lib/values-Xa.o /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/crtbegin.o -L/usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1 -L/usr/ccs/bin -L/usr/ccs/lib -L/usr/local/gnu/lib x.o -lgcc -lc -lgcc /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/crtend.o /usr/local/gnu/lib/gcc-lib/i386-pc-solaris2.6/2.95.1/crtn.o
ld: Software Generation Utilities - Solaris/ELF (3.0)

------**  source file **--------
// file x.cc
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>

class Char {

  // class data
  //
protected:

  wchar_t value_d;

  // public methods
  //
public:

  // destructor/constructor(s)
  //
  inline ~Char() {
  }

  inline Char() {
    value_d = L'\0';
  }

  inline Char(Char& arg) {
    value_d = arg.value_d;
  }

  inline Char(wchar_t arg) {
    value_d = arg;
  }

  // assignment methods
  //
  inline bool assign(wchar_t arg) {
    value_d = arg;
  }
  
  inline bool assign(Char& arg) {
    value_d = arg.value_d;
  }
  
  // relational methods
  //
  // an overloaded methd which takes a Char& and returns a bool
  inline bool gt(Char& arg) {
    return (bool)(value_d > arg.value_d);
  }
  inline bool gt(wchar_t arg) {
    return (bool)(value_d > arg);
  }

  inline bool gt(int x, float y) {
    return (bool)(value_d > x);
  }

  // a non-overloaded method which takes a Char& and returns a bool
  inline bool test(Char& arg) {
    // call gt
    return gt(arg);
  }

};

// inherit a class from the base class Char.
//
class InheritChar : public Char {

public:
  ~InheritChar() {}
  InheritChar() {}
  InheritChar(InheritChar& arg) {
    assign(arg);
  }
};

template <class TObject>
class Test {

public:

  // destructor/constructor(s)
  //
  inline ~Test() {}
  inline Test() {}
  inline Test(Test<TObject>& arg) {
    local_obj_d.assign(arg.local_obj_d);
  }
  
  // data
  //
  TObject local_obj_d;

  // test method
  //
  inline bool test_it(bool (TObject::*method_a)(TObject&)) {

    local_obj_d.assign(L'a');
    TObject test_obj(L'b');

    // see which is greater
    //
    bool grthan = (local_obj_d.*method_a)(test_obj);

    if (!grthan) {
      fprintf(stdout, "a less than b\n");
    }
    else {
      fprintf(stdout, "a greater than b\n");
    }
    return grthan;
  }
};

int main() {

  /* TEST CASE I - from what I can read from the standard, this should compile
   * and function properly
   */

  /*
    // This section does not compile
     
  Test<InheritChar> test_class;

  // test the overloaded version - error from this one is:
  //  no matching function for call to
  //  `Test<InheritChar>::test_it ({unknown type})'
  //  candidates are:
  //  bool Test<InheritChar>::test_it(bool (InheritChar::*)(InheritChar &))
  //
  test_class.test_it(&InheritChar::gt);

  // test the non-overloaded version - error from this one is
  //  no matching function for call to
  //  `Test<InheritChar>::test_it (bool (Char::*)(Char &))'
  //  candidates are:
  //  bool Test<InheritChar>::test_it(bool (InheritChar::*)(InheritChar &))
  //
  test_class.test_it(&InheritChar::test);

  */

  /* TEST CASE II - this section also does not compile and this probably
   * should not compile, but I wanted to include it for completeness
   */

  /*
  Test<InheritChar> test_class;

  // test the overloaded version - error from this one is:
  //  no matching function for call to
  //  `Test<InheritChar>::test_it ({unknown type})'
  //  candidates are:
  //  bool Test<InheritChar>::test_it(bool (InheritChar::*)(InheritChar &))
  //
  test_class.test_it(&Char::gt);

  // test the non-overloaded version - error from this one is
  //  no matching function for call to
  //  `Test<InheritChar>::test_it (bool (Char::*)(Char &))'
  //  candidates are:
  //  bool Test<InheritChar>::test_it(bool (InheritChar::*)(InheritChar &))
  //
  test_class.test_it(&Char::test);

  */
  /*  
  // TEST CASE III This section does compile
  //
  Test<Char> test_class;

  // test the overloaded version
  //
  test_class.test_it(&Char::gt);

  // test the non-overloaded version
  //
  test_class.test_it(&Char::test);
  */
}




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`
end


> > I think there is a problem in name resolution of pointers to overloaded 
> > member functions. 
> 
> Thanks for your bug report. I think there is a problem with your test
> case. In fact, there are numerous problems:
...
Follow-Ups:
- Re: pointers to overloaded member functions
  - From: Martin v. Loewis
References:
- Re: pointers to overloaded member functions
  - From: Martin v. Loewis
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