• chris elliott (31/31) Jun 01 2005 I got this with a recent (843.6n) dmc, but it was ok in about 834/835
• Walter (8/9) Jun 01 2005 This is the problem line, it tries to convert:
• chris elliott (3/17) Jun 02 2005 thank you for the clear explanation
• Walter (7/16) Jun 02 2005 I forgot to mention, the reason it "worked" before was the compiler rewr...
• chris elliott (4/27) Jun 03 2005 thanks, the code also "works" with VC, Borland, watcom compilers (and I
• chris elliott (3/10) Jun 03 2005 I forgot to say, how good it is to have dm spot such code bugs !Thanks

chris elliott <biol75 york.ac.uk> writes:

I got this with a recent (843.6n) dmc, but it was ok in about 834/835

Is this a bug, or something wrong in the wxWidgets code  (code based on 
oleutils.h)

chris


C:\compiler>dmc -mn -c  -g -o+none -Ar -Ae -H -HO- dmc_test.cpp
dmc_test.cpp(9) : Error: reference must refer to same type or be const
Had: int
and: int &
{
^
dmc_test.cpp(18) : Error: '=', ';' or ',' expected
}
^
dmc_test.cpp(20) : Error: identifier or '( declarator )' expected
--- errorlevel 1



dmc_test.cpp:

#define ULONG int

class wxAutoULong
{
public:
     wxAutoULong(ULONG value = 0) : m_Value(value) { }

     operator ULONG&() { return m_Value; }
     ULONG& operator=(ULONG value) { return m_Value = value; }

  private:
     ULONG m_Value;
};

wxAutoULong A, B ;

int main
{
     A=B;
}

"Walter" <newshound digitalmars.com> writes:

"chris elliott" <biol75 york.ac.uk> wrote in message
news:d7kk7t$1uld$1 digitaldaemon.com...
      ULONG& operator=(ULONG value) { return m_Value = value; }

This is the problem line, it tries to convert:
    return m_Value=value;
into a reference. But it isn't a reference, it's an assignment expression.
Rewrite as:
    m_Value = value;
    return m_Value;

chris elliott <biol75 york.ac.uk> writes:

thank you for the clear explanation
chris

Walter wrote:
 "chris elliott" <biol75 york.ac.uk> wrote in message
 news:d7kk7t$1uld$1 digitaldaemon.com...
 
     ULONG& operator=(ULONG value) { return m_Value = value; }

 
 
 This is the problem line, it tries to convert:
     return m_Value=value;
 into a reference. But it isn't a reference, it's an assignment expression.
 Rewrite as:
     m_Value = value;
     return m_Value;
 
 

"Walter" <newshound digitalmars.com> writes:

"Walter" <newshound digitalmars.com> wrote in message
news:d7lfbj$2nmg$1 digitaldaemon.com...
 "chris elliott" <biol75 york.ac.uk> wrote in message
 news:d7kk7t$1uld$1 digitaldaemon.com...
      ULONG& operator=(ULONG value) { return m_Value = value; }

 This is the problem line, it tries to convert:
     return m_Value=value;
 into a reference. But it isn't a reference, it's an assignment expression.
 Rewrite as:
     m_Value = value;
     return m_Value;

I forgot to mention, the reason it "worked" before was the compiler rewrote
the code as:
    tmp = (m_Value = value);
    return tmp;
This is no longer in conformance with the C++ Standard, so was removed.

chris elliott <biol75 york.ac.uk> writes:

Walter wrote:
 "Walter" <newshound digitalmars.com> wrote in message
 news:d7lfbj$2nmg$1 digitaldaemon.com...
 
"chris elliott" <biol75 york.ac.uk> wrote in message
news:d7kk7t$1uld$1 digitaldaemon.com...

     ULONG& operator=(ULONG value) { return m_Value = value; }

This is the problem line, it tries to convert:
    return m_Value=value;
into a reference. But it isn't a reference, it's an assignment expression.
Rewrite as:
    m_Value = value;
    return m_Value;

 
 
 I forgot to mention, the reason it "worked" before was the compiler rewrote
 the code as:
     tmp = (m_Value = value);
     return tmp;
 This is no longer in conformance with the C++ Standard, so was removed.
 
 

thanks, the code also "works" with VC, Borland, watcom compilers (and I 
guess gcc)

chris

chris elliott <biol75 york.ac.uk> writes:

chris elliott wrote:
 
 

I forgot to say, how good it is to have dm spot such code bugs !Thanks 
again for all the rapid support

 thanks, the code also "works" with VC, Borland, watcom compilers (and I 
 guess gcc)
 
 chris