Re: "Not really an lvalue" warnings
Re: "Not really an lvalue" warnings
- Subject: Re: "Not really an lvalue" warnings
- From: Marshall Clow <email@hidden>
- Date: Fri, 6 Apr 2007 15:22:33 -0700
At 2:48 PM -0700 4/6/07, Mark Wagner wrote:
The following code produces a warning from GCC about "target of
assignment not really an lvalue; this will be a hard error in the
future". What's going wrong, and how do I fix it?
char *typeOfQ = NULL;
static_cast<const char *>(typeOfQ) =
handle.FirstChildElement("fieldlabel").Element()->NextSiblingElement("fieldentry")->GetText();
GCC is telling you that there is a problem in your code (hence the
warning), and telling you that future versions of the compiler will
flag this as an error rather than a warning.
This expression:
static_cast<const char *>(typeOfQ)
is not a variable, it is a expression.
Think of the difference between 'x' and '3' - one can be assigned to,
the other cannot )
Googling for "rvalue" and "lvalue" will give more general information.
--
-- Marshall
Marshall Clow Idio Software <mailto:email@hidden>
It is by caffeine alone I set my mind in motion.
It is by the beans of Java that thoughts acquire speed,
the hands acquire shaking, the shaking becomes a warning.
It is by caffeine alone I set my mind in motion.
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