Re: [Boost-bugs] [Boost C++ Libraries] #6495: consider implementing traits for numeric types in terms of numeric_limits

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #6495: consider implementing traits for numeric types in terms of numeric_limits
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-01-30 19:17:01

#6495: consider implementing traits for numeric types in terms of numeric_limits
-------------------------------+--------------------------------------------
  Reporter:  ramey             |       Owner:  johnmaddock                                  
      Type:  Feature Requests  |      Status:  closed                                       
 Milestone:  To Be Determined  |   Component:  type_traits                                  
   Version:  Boost 1.48.0      |    Severity:  Problem                                      
Resolution:  invalid           |    Keywords:  is_signed, is_unsigned, is_float, is_integral
-------------------------------+--------------------------------------------
Changes (by johnmaddock):

  * status:  new => closed
  * resolution:  => invalid

Comment:

 Nope sorry, the whole raison d'etre of type traits is to inspect the
 properties of a *type*.  is_integer etc will only ever be specialized for
 built-in types, because "big_integer" is *not* an integer, it's class
 type.  This whole topic has been thrashed out several times (not least
 when type traits were first proposed), and isn't going to change now.

 Besides you can get the information you require from numeric_limits
 directly:

 is_integer == true
    All integer types.
    is_bounded == true
        has min and max values
    is_signed == true
        signed integer otherwise unsigned

 is_integer == is_exact == false
    floating point type

 Regards, John.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6495#comment:1>
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