What is this code doing?

[oddvark]

Hello,

dispose() is a function of dragtool. In the code below, its called
but without the ().

if(parent->dragTool != null)
{
parent->dragTool.dispose;
}

Under MS visual studio 7.1, this compiles. But not under 8. The
question is, what is it really doing under 7.1. Is it making the
function call, or does it think that this is some kind of function
reference?

Thanks.

 

[Ben Schumeth]

Hello,

dispose() is a function of dragtool. In the code below, its called
but without the ().

if(parent->dragTool != null)
{
parent->dragTool.dispose;
}

Under MS visual studio 7.1, this compiles. But not under 8. The
question is, what is it really doing under 7.1. Is it making the
function call, or does it think that this is some kind of function
reference?

The fact that it doesn't compile under VC8 is an indication that it's a
bug in VC7 (although it could of course be the other way around, but
that's less likely). Trying to compile the same code under different
compilers would help strengthen that idea. Without seeing more code it's
impossible to be sure of course, but this does seem like incorrect
syntax. A pointer to the dispose function would be declared as
&DragToolClass::dispose

I'm also somewhat puzzled as to why you compare dragTool to null, when it
is not a pointer, as indicated by the dot operator used inside the if
statement. This could be perfectly alright, but it does look weird.

As to finding out what it does, why don't you just add a line to dispose
to show some output - an assert, a messagebox, printing to stdout, ...
That way you'll see what it does right away.

Ben

 

[terminator]

The fact that it doesn't compile under VC8 is an indication that it's a
bug in VC7 (although it could of course be the other way around, but
that's less likely). Trying to compile the same code under different
compilers would help strengthen that idea. Without seeing more code it's
impossible to be sure of course, but this does seem like incorrect
syntax. A pointer to the dispose function would be declared as
&DragToolClass::dispose

I'm also somewhat puzzled as to why you compare dragTool to null, when it
is not a pointer, as indicated by the dot operator used inside the if
statement. This could be perfectly alright, but it does look weird.

As to finding out what it does, why don't you just add a line to dispose
to show some output - an assert, a messagebox, printing to stdout, ...
That way you'll see what it does right away.

Ben- Hide quoted text -

- Show quoted text -

I guess that code was programmed for microsoft specific extentions to C
++ which cause some syntacticl differences.Search an answer to the
question here:
http://groups.google.com/group/microsoft.public.vc.mfc/topics

regards,
FM