Re: Can't use CPoint as reference parameter?
"Li Hang" wrote:
My envir: VC6.0, Windows XP
My function:
void TransToWindow(CPoint& p) {...}
When I invoke the function like below:
...
CPoint p( int(somefloat1), int(somefloat2) ); //
somefloat1 and
somefloat2 is float variables
TransToWindow( p );
...
The compiler report "...can't convert from class
CPoint(int, int) to
CPoint&..."
Maybe I make a funny mistake, but I don't know the reason.
It happens because instead of declaring variable of type
`CPoint' you actually declared a function with name `p',
which takes two int's as parameters and returns `CPoint'
value. This is known C++ peculiarity, which can be
circumvented by slightly different declaration:
CPoint p( (int)somefloat1, (int)somefloat2 );
Alternatively, just let the compiler to do necessary
conversion by itself:
CPoint p( somefloat1, somefloat2 );
This behavior happens because compiler tries to interpret a
declaration in favor of function first, and if it doesn't
succeed, then declaration of variable is assumed.
HTH
Alex
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