[Boost-users] How to make is_arithmetic true for a UDT

Subject: [Boost-users] How to make is_arithmetic true for a UDT
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2012-07-12 04:37:41

I am facing the need to get my User Defined Type to return true from

  boost::is_arithmetic

(This is to meet a check for autoprefixing in Boost.Units)

There was some discussion on this issue before, 

http://listarchives.boost.org/boost-users/2007/10/31538.php

but I am not clear if it reached a satisfactory conclusion.

(Nor that I fully understand what is being proposed).

A cut-down example is a Trivial UDT that does exactly same as double.
(My actual example has template parameter for floating-point type of two members, a value and an
uncertainty, and others).

Suggestions?

Paul

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