Re: [boost] float_mem_cast

Subject: Re: [boost] float_mem_cast
From: Steven Ross (spreadsort_at_[hidden])
Date: 2009-05-26 12:56:41

My samples use the typecast because it's necessary when sorting on a
floating point key that isn't identical to the data type (such as key plus
data sorting); should they use it from the detail namespace?  If that's
reasonable, then I'll move it.

On Tue, May 26, 2009 at 6:53 AM, Steven Watanabe <watanabesj_at_[hidden]>wrote:

> AMDG
>
>
> Steven Ross wrote:
>
>> There is one function necessary for users to be able to cast their own
>> float
>> types.  Should it be in spreadsort.hpp or some separate header file?  It
>> seems silly to have a separate header file for it, but I guess it might be
>> used on its own.
>>
>> //Casts a float to the specified integer type
>>  template<class Data_type, class Cast_type>
>>  inline Cast_type
>>  float_mem_cast(const Data_type & data)
>>  {
>>    //Only cast IEEE floating-point numbers, and only to a same-sized
>> integer
>>    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);
>>    Cast_type result;
>>    std::memcpy(&result, &data, sizeof(Cast_type));
>>    return result;
>>  }
>>
>>
>
> Pu it in a detail namespace.  If others need the same functionality,
> we can discuss generalizing it then.
>
> In Christ,
> Steven Watanabe
>
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