Re: [boost] [GSoC] [Checks] Issue with the design

Subject: Re: [boost] [GSoC] [Checks] Issue with the design
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2011-08-02 04:30:33

On 08/02/2011 12:03 AM, Jeffrey Lee Hellrung, Jr. wrote:

> You'll have to generate something like
>
> template<  int = invalid_weight, int = invalid_weight, /* repeat some pp
> constant # of times, e.g., BOOST_CHECK_LIMIT_WEIGHTS times */, int =
> invalid_weight>
> struct weight_policy;
>
> template<  int weight0>
> struct weight_policy<  weight0, invalid_weight, invalid_weight, /* ...and so
> on... */, invalid_weight>
> { /* definition */ };
>
> template<  int weight0, int weight 1>
> struct weight_policy<  weight0, weight1, invalid_weight, /* ...and so on...
> */, invalid_weight>
> { /* definition */ };
>
> You'll need to make use of BOOST_PP_SUB to generate the sequence of
> "invalid_weight"s in the specializations.

template<int weight0, int weight1 = invalid_weight, int weight2 = 
invalid_weight, ...>
struct weight_policy;

template<int weight0>
struct weight_policy<weight0>
{
   /* definition */
};

template<int weight0, int weight1>
struct weight_policy<weight0, weight1>
{
   /* definition */
};

etc. is enough.

The extra parameters already have defaults, so it's not needed to repeat 
them.

Though I do not see what the point of that policy is.