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c++.wxwindows - error in recent dmc

reply 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;
}
Jun 01 2005
parent reply "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;
Jun 01 2005
next sibling parent 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;
Jun 02 2005
prev sibling parent reply "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.
Jun 02 2005
parent reply 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.
 
 



guess gcc)

chris
Jun 03 2005
parent chris elliott <biol75 york.ac.uk> writes:
chris elliott wrote:

 
 



again for all the rapid support



 guess gcc)
 
 chris






 Jun 03 2005