Re: [boost] Re: Re: relational table as an STL container -- anyinterest?

From: Rene Rivera (grafik666_at_[hidden])
Date: 2002-11-01 18:15:53

[2002-11-01] Arkadiy Vertleyb wrote:

>The FIELD macro is used to access a field inside a tuple.  It unwraps into
>the call to the templated method on the tuple class that further calls
>static_cast to access the field.  So we now have:
>
>FIELD(tuple, c1) = 5; // we have it now
>
>but would like to have:
>
>tuple.field<c1>() = 5; // we want it like this
>
>Neither MSVC nor g++ allows us to do this.  Is there anything about the
>standard that makes it illigal?  The best we could do is:
>
>tuple.field((c1*)0) = 5; // pretty ugly, isn't it?
>
>So, we decided to have the macro :o((

I have a similar pattern in my code and I use this declaration, which works
in CW8 and G++:

class some_class
{
    public:
    
    template <class some_type> some_type & getSomething(
        const some_type * _placeholder_ = 0)
    {
        //...
    }
};

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