Re: [boost] Formal Review: any

From: Kevlin Henney (kevlin_at_[hidden])
Date: 2000-11-07 11:18:44

In message <3A03121E.BFD6C878_at_[hidden]>, Dan Nuffer
<dnuffer_at_[hidden]> writes
>After fiddling around some more, I found an even better way to get g++
>to compile this.
>There is no need for to_ptr_helper, simply change any_cast like this:
>
>    template<typename ValueType>
>    ValueType any_cast(const any & operand)
>    {
>        const ValueType * result =
>                         operand.template to_ptr<ValueType>();
>
>        if(!result)
>        {
>            throw bad_any_cast();
>        }
>
>        return *result;
>    }
>
>Adding "template" in the middle of "operand.to_ptr" looks strange, but
>it's valid and helps g++ parse it correctly.

Thanks for this. I will document this under usage of to_ptr and in the
portability section. It's worth noting that this doesn't fix the problem
under MSVC :-(

Kevlin
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