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2 total messages Started by kenneth baclawski Wed, 04 Oct 1989 00:28

#462

Author: kenneth baclawski
Date: Wed, 04 Oct 1989 00:28

62 lines
1945 bytes

/*
     Problem with GNU C++ virtual conversion operators

Compilation:
g++ -v conv_op.c -o conv_op
g++ version 1.35.1-
 /kens-disk/k/gnu/lib/gcc-cpp -+ -v -undef -D__GNU__ -D__GNUG__ -D__cplusplus -Dmc68000 -Dsun -Dunix -D__mc68000__ -D__sun__ -D__unix__ -D__HAVE_68881__ -Dmc68020 conv_op.c /tmp/cca08205.cpp
GNU CPP version 1.35
 /kens-disk/k/gnu/lib/gcc-cc1plus /tmp/cca08205.cpp -quiet -dumpbase conv_op.c -noreg -version -o /tmp/cca08205.s
GNU C++ version 1.35.1- (68k, MIT syntax) compiled by GNU C version 1.35.
 as -mc68020 /tmp/cca08205.s -o conv_op.o
 /kens-disk/k/gnu/lib/gcc-ld++ -o conv_op -C -e __start -dc -dp /kens-disk/k/gnu/lib/crt0+.o /kens-disk/k/gnu/lib/Mcrt1.o conv_op.o -lg++ /kens-disk/k/gnu/lib/gcc-gnulib -lc

Output:
z::convert()
y::convert()
z::operator x()
z::operator x()
z::operator x()
z::operator x()
...

Output using AT&T C++:
z::convert()
y::convert()
z::operator x()
y::operator x()

*/

extern void printf (const char*, ...);

class x { 
  int a;

public:
  x (int i) { a = i; }
};

class y {
  int b;

public:
  y (int j) { b = j; }
  virtual operator x() { printf ("y::operator x()\n"); return x(b); }
  virtual x convert() { printf ("y::convert()\n"); return x(b); }
};

class z : public y {

public:
  z (int k) : (k) {}
  operator x() { printf ("z::operator x()\n"); return y::operator x(); }
  x convert() { printf ("z::convert()\n"); return y::convert(); }
};

main()
{
  z g = 1;
  g.convert();
  (x) g;
}

Re: (none)

#466

Author: Doug Schmidt
Date: Wed, 04 Oct 1989 04:34

30 lines
1392 bytes

In article <8910040028.AA01285@flora.CCS.Northeastern.EDU>, kenb@flora (kenneth baclawski) writes:
>/*
>     Problem with GNU C++ virtual conversion operators
[omitted]

You need to get the latest g++ (1.36.0-)

% /usr/gnu/g++ virt-test.cc -lg++
% a.out
z::convert()
y::convert()
z::operator x()
y::operator x()

Note also that you'll need to either 

#include <stdio.h> 

or say 

extern "C" void printf (const char*, ...);

since g++ now mangles names a la cfront 2.0.

Doug
--
schmidt@ics.uci.edu (ARPA) |   Per me si va nella citta' dolente.
office: (714) 856-4043     |   Per me si va nell'eterno dolore.
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