On 10/14/05, Robert Kawulak <kawulak@student.agh.edu.pl> wrote:
Hi,
From: Peder Holt
It would perhaps be a good idea to use mpl::int_<> instead of give_number<> to specify a constraint limit.
But the point is that give_number is a function object type, it can't be replaced with a template metafunction. If one wants to have integral bounds, he may use bounded_int which takes integral constants as its parameters.
You can also use mpl::math::double_c<> (available from the file vault: Template Metaprogramming/mpl_math.zip)
The problem is double_c is not a function object type - it only defines operator value_type(). If it'd also define
value_type operator() () { return static_cast<value_type>(*this); }
The mpl numerical holder classes already define a conversion operator, converting the held number to some native type defined by value_type. Would it not be possible to modify your library to use the conversion operator in stead? I don't think modifying mpl for this is a good idea...
then it would be usable in this case. Maybe you'll consider the possibility to add this operator to double_c?
To extract a runtime equivalent: boost::mpl::runtime_value<MinValGen::value_type>(MinValGen());
There's something I don't understand - what does the above line do? I can't see runtime_value having a constructor?
Sorry. Typo. Should be: boost::mpl::runtime_value<MinValGen::value_type>()(MinValGen()); Basically the same as: MinValGen::value_type(MinValGen()), except not all the types in mpl::math has a conversion operator (yet...) Regards, Peder
Best regards, Robert
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