Boost Users :
Subject: Re: [Boost-users] [EXTERNAL] [ Boost.Units ] Invert a quantity_type
From: Belcourt, Kenneth (kbelco_at_[hidden])
Date: 2017-06-09 15:41:36
> On Jun 8, 2017, at 1:51 PM, Steven Watanabe via Boost-users <boost-users_at_[hidden]> wrote:
> On 06/06/2017 05:12 PM, Belcourt, Kenneth via Boost-users wrote:
>> I have a structure that is passed some type from which I can extract a units quantity type:
>> Is there a way to invert a quantity type so I can compute and return, say, the inverse of the passed quantity_type? So, for example, is there any Boost.Units inverse meta like function that might let me say something like this:
>> Iâm hoping for something more general than partially specializing the bu::inverse method for each quantity I may want to invert. Any ideas?
> There isn't a specific inverse function, but,
> shouldn't divide_typeof_helper work or
> power_typeof_helper<T, -1> work? (or better
> just use decltype)
Sure, thought about using the helper functions, but theyâre all marked as non-public APIs.
/// INTERNAL ONLY
struct divide_typeof_helper< X,unit<Dim,System> >
So donât want to depend on bu implementation details.
As for decltype, thatâs possibly a bridge too far for less experienced developers so, for now, I still prefer explicit typing where I can.
I appreciate the help Steven, thanks for suggestions!
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