Re: [boost] [Boost.FixedPoint] Choose notation

On 4/29/2013 2:26 AM, Michael Marcin wrote:

On 4/29/2013 1:46 AM, Andrey Semashev wrote:

...

Please, no cryptic abbreviations (and especially one letter names).

I've always felt that if floating point numbers are called float then fixed point numbers should be called fixed.

fixed<24,8> representing a signed 24.8 fixed-point would be my preferred naming convention.

It could be an alias for signed_fixed<24,8> much like int is for signed int. Then naturally if you needed to support unsigned fixed point types you could use unsigned_fixed<24,8>.

I could see an argument made for fixed specifying the storage type and the radix, in this case 28.4. This handles the signed vs unsigned naturally and doesn't allow you to have (in my view) strange types like 8.4 which seems to require an odd 12bit integer type.

If you absolutely needed an 8.4 type then you need fixed-width integer support beyond that provided by <cstdint>. You could provide an implementation of integer<12> that is a 12 bit integer and then make fixed,4>. In my opinion this is another library outside the scope of a fixed-point library.

There is also a possibility of both interfaces together I suppose. template< std::size_t M, std::size_t F, typename Storage = typename boost::int_t::least > class fixed;