Re: [boost] [mpl] is_macro_called

Subject: Re: [boost] [mpl] is_macro_called
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2010-04-04 19:21:05

AMDG

Lorenzo Caminiti wrote:
> On Sat, Apr 3, 2010 at 4:44 PM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
>   
>> How do you prevent someone from defining the member function
>> out of line?  Even if you could do it, it seems prone to subtle bugs.
>>     
> -
> I understand but I would be interested in a solution even if it had
> limitations. In this specific case, even if the solution was to only
> work when the member function is defined inline within the class, I
> would still be interested in it.
>
> However, even for inlined member functions, personally I could not
> come up with any code that I can program within the member function
> definition scope which has an effect that can be inspected at
> compile-time at the class definition scope...

Even if it could be done on some compilers, it wouldn't be portable
because there's a good chance that the compiler won't try to compile
the member functions until it's finished with the class body.

Try compiling this
class C {
    void f() {
        int i = ::test;
    }
    static const int i = ::test;
};

The first error is likely to be for the class member rather than
inside f.

In Christ,
Steven Watanabe