Re: Address of member in class scope
marwan.taher@gmail.com schrieb:
Can someone tell me why the following code won't compile? I am taking
the address of a class member within the class's declaration. This
works for a pointer to member function, but fails for a pointer to
data member. Is my compiler at fault? Or does the standard explicitly
forbid this?
The standard does not explicitely forbid that. IMO the code
(commented or uncommented) is fine, therefore using
3.3.1/4 as reference, which says
"After the point of declaration of a class member, the member name
can be looked up in the scope of its class. [Note: this is true even
if
the class is an incomplete class. For example,
struct X {
enum E { z = 16 };
int b[X::z]; // OK
};
-end note]"
Additionally I also see no reasons why your example
should violate anyone of the requirements described
in 3.3.6 ([basic.scope.class]), especially not for
2) "A name N used in a class S shall refer to the same declaration
in its context and when re-evaluated in the completed scope of S.
No diagnostic is required for a violation of this rule."
or
3) "If reordering member declarations in a class yields an alternate
valid program under (1) and (2), the program is ill-formed, no
diagnostic is required."
I also observed that existing implementations differ here. E.g.
both Comeau and mingw 3.4 accept the code, but VS2005-SP1
rejects it (I guess you have tested the last one?).
Greetings from Bremen,
Daniel Kr?gler
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