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From: Eric Niebler (eric_at_[hidden])
Date: 2008-03-15 16:07:38

Markus Werle wrote:
> First of all: This is a very nice example.
> Fantastic idea to introduce index information stored
> in the terminals at this place in the docs - perfect.


> If you define arg as
> template<int I> struct arg {};
> and change the code accordingly the reader is not in need
> to know anything about mpl::int_ and IMHO the code


Right, this is a good suggestion. And arg should be renamed to
placeholder to avoid confusion with proto::arg and to make it consistent
with Calc3. And I should make the same change to Calc1.

Note however that in the Calc3 example, the template parameter must stay
mpl::int_ instead of an int. Otherwise, the CalculatorGrammar won't
work. Non-type template parameters are the bane of metaprogramming.

Eric Niebler
Boost Consulting

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