Path: utzoo!telly!attcan!dptcdc!jarvis.csri.toronto.edu!mailrus!ukma!tut.cis.ohio-state.edu!GARP.MIT.EDU!lotus!steveng
From: lotus!steveng@GARP.MIT.EDU (Stephen Ng)
Newsgroups: gnu.g++.bug
Subject: g++ bugs
Message-ID: <8904111433.AA00725@lotus.lotus.com>
Date: 11 Apr 89 14:33:22 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 58

Hi, I've just tried porting over a large number of files from cfront to g++. 
I'm using g++ 1.34.0. Here are two of the problems I found:

1) Description:  g++ doesn't implicitly cast between fundamental types if the
return value of a member function is a reference which is immediately used as an
argument for another function.

Example:

char &ref_return();

class c
{
        public:
                int_arg(int i);
};

void foo()
{
        c c1;
        c1.int_arg(ref_return());
}
works in cfront, but produces "bad argument 0 for function 'c::int_arg (int)'
(type was char &)

Workaround:
Assign the return value to a temporary variable and use the temporary as the
function argument.

2) Description:  g++ doesn't initialize by assignment for a class if the class
a) has no constructor explicitly declared and b) if the class has a member class
 which has a constructor.

Example:
                
class Member {
public:
        Member();
};

class Foo {
        Member mem;
};

void func()
{
        Foo f1;
        Foo f2 = f1;
}

This passes through cfront properly, but generates a "unexpected argument to
constructor 'Foo'" error in g++.
Workaround: 
        explicitly declare a constructor for class Foo.

Thanks,

Steve