Re: [boost] [Review] Type Traits Introspection library by Edward Diener starts tomorrow Friday 1

Subject: Re: [boost] [Review] Type Traits Introspection library by Edward Diener starts tomorrow Friday 1
From: Edward Diener (eldiener_at_[hidden])
Date: 2011-07-02 08:57:00

On 7/2/2011 4:44 AM, John Maddock wrote:
>>> I mean things like
>>>
>>> struct A
>>> {
>>> static const int value = 42;
>>> };
>>
>> That works correctly in the library for gcc and VC++. Evidently the
>> code that tests, which uses an expression of &A::value, is accepted by
>> those compilers. Is it illegal to take the address of a static const
>> data member in C++ ?
>
> No, but you *may* need an out-of-line definition for the member "value"
> if the compiler considers the address to be "used": my guess is you're
> only using it within the context of another metafunction, so probably
> this should be OK.... probably ;)

Is there a relevant section in the C++ standard about this which you can 
cite offhand ?

In my quick test of this I did not specify an out-of-line definition but 
then again I am not "using" the const value in any other way then to 
test against it.