Re: [boost] Proposed templated integer_sort

Subject: Re: [boost] Proposed templated integer_sort
From: Steven Ross (spreadsort_at_[hidden])
Date: 2009-02-01 18:11:36

On Wed, Jan 14, 2009 at 10:26 AM, Steven Watanabe <watanabesj_at_[hidden]>wrote:

> AMDG
> Phil Endecott wrote:
>
>> It would be good if it were possible to automatically detect whether a
>> floating point type is one for which the cast-to-integer trick works.  It
>> would be great if C++ defined some macro or similar that defined whether
>> float and double were IEEE 754 or not.  (Hmm, is there some sort of
>> type_traits thing to do this?).
>>
>
> Are you thinking of std::numeric_limits<>::is_iec559?
>
>
I've added these static assertions in the casting methods:
    BOOST_STATIC_ASSERT(sizeof(cast_type) == sizeof(data_type));
    BOOST_STATIC_ASSERT(std::numeric_limits<data_type>::is_iec559);
    BOOST_STATIC_ASSERT(std::numeric_limits<cast_type>::is_integer);
That should guarantee I'm casting an IEEE floating-point number to an
integer of the same size.

Also, using toolset=darwin resolved by bjam issue, and my tests run and pass
now.

Thanks for your help Steve.