Pointer issues

[bob]

In some code I have the following:

1) (*p) ->value;
2) *p->value;

1) gives an error while 2) works. What are the difference between 1)
and 2)?

[=?ISO-8859-1?Q?Erik_Wikstr=F6m?=]

On 2007-06-09 16:41, bob wrote:

In some code I have the following:

1) (*p) ->value;
2) *p->value;

1) gives an error while 2) works. What are the difference between 1)
and 2)?

1 will first try to dereference p and then call the -on what p points
to, this will only work if what p points to have overloaded that
operator or if p is of type T** (pointer to pointer).

2 on the other hand first uses the -operator on p and then
dereferences value (meaning that value is a pointer). So another way to
write 2 is *(p-value).

--
Erik Wikström

[Jim Langston]

"bob" <tu*****@gmail.comwrote in message
news:11**********************@w5g2000hsg.googlegro ups.com...

In some code I have the following:

1) (*p) ->value;
2) *p->value;

1) gives an error while 2) works. What are the difference between 1)
and 2)?

You need to look up "operator precidence". That states what order the
compiler will interpret operators. -has a higher precidence than *
(dereference). So -is evaluated first giving you:
*(p->value).