[boost] [constrained-value] additional features

From: Martin Dowie (martin.dowie_at_[hidden])
Date: 2007-08-31 15:54:40

I've managed to download this now (thanks!) and I've played about with added
support for floats/doubles.

 

I'd also quite like the idea of being able to retrieve the range of a
constrained value so that I can use them in other more constrained values -
e.g. degrees in a circle => [0, 359] but sometimes only half a circle is
appropriate [0, 179]. I'd like to be able to model this, e.g.

 

typedef bounded_int<int, 0,                        359>::type
degrees_in_circle;

typedef bounded_int<int, degrees_in_circle::first, 180>::type
degrees_in_semicircle;

 

That's a bit contrived but hopefully you get my drift.

 

Ada uses 'First and 'Last to get this sort of value and I've always found
these sort of attributes (or 'traits') very useful.

 

Cheers

-- Martin