Inder writes:
> Hi All
>
> I am trying to compile 'test.cc' (code attached) with the gcc 4.0.1
> it gives me the following error:
>
> test.cc:19: error: array bound is not an integer constant
>
> so it is not able to evaluate the conditional expression in gcc 4.0.1,
> while this is being compile by gcc 3.4 without any errors.
>
> Is this a bug in gcc 4.0.1
>
> Any help will be appreciated.
my_offsetof isn't legal C++. In addition:
5.19 Constant expressions
In several places, C ++ requires expressions that evaluate to an
integral or enumeration constant: as array bounds (8.3.4, 5.3.4), ...
constant-expression:
conditional-expression
An integral constant-expression can involve only literals (2.13),
enumerators, const variables or static data members of integral or
enumeration types initialized with constant expressions (8.5),
non-type template parameters of integral or enumeration types, and
sizeof expressions. Floating literals (2.13.3) can appear only if
they are cast to integral or enumeration types. Only type conversions
to integral or enumeration types can be used. In particular, except
in sizeof expressions, functions, class objects, pointers, or
references shall not be used, and assignment, increment, decrement,
function-call, or comma operators shall not be used.
Why don't you just use offsetof ?
Andrew.
