Re: [Boost-users] [units] Creating a velocity unit

Subject: Re: [Boost-users] [units] Creating a velocity unit
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2013-02-21 15:18:20

AMDG

On 02/21/2013 12:09 PM, Ryan wrote:
>>
>> I suppose that it would also be possible to use only the
>> object, and use decltype whenever you need a type.
> 
> 
> I tried using the decltype to get the type but got an error.  Is this how
> you meant to use it?
> 
> typedef  metric::nautical_mile_base_unit::unit_type nautical_mile_unit;
> static const nautical_mile_unit nautical_mile;
> 
> quantity<decltype(nautical_mile)>(2.3 * nautical_mile);
> 

Yes, that's what I meant, but now that I see it written
out, it's wrong because decltype keeps the const qualifier.
You need the behavior of the non-standard typeof operator.
BOOST_TYPEOF should work.

In Christ,
Steven Watanabe