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Merge pull request #17 from jansende/patch-2

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Optimized floating point unit conversions
This commit is contained in:
Mateusz Pusz
2019-10-01 20:08:01 +02:00
committed by GitHub
parent 12200f6f40 a11f5a92b6
commit 7c4e5d086a
1 changed files with 15 additions and 0 deletions
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15
src/include/units/quantity.h
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@@ -89,6 +89,14 @@ namespace units {
template<typename To, typename CR, typename CRep, bool NumIsOne = false, bool DenIsOne = false> template<typename To, typename CR, typename CRep, bool NumIsOne = false, bool DenIsOne = false>
struct quantity_cast_impl { struct quantity_cast_impl {
template<typename Q> template<typename Q>
requires treat_as_floating_point<CRep>
static constexpr To cast(const Q& q)
{
return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * (static_cast<CRep>(CR::num) /
static_cast<CRep>(CR::den))));
}
template<typename Q>
requires !treat_as_floating_point<CRep>
static constexpr To cast(const Q& q) static constexpr To cast(const Q& q)
{ {
return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CR::num) / return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * static_cast<CRep>(CR::num) /
@@ -108,6 +116,13 @@ namespace units {
template<typename To, typename CR, typename CRep> template<typename To, typename CR, typename CRep>
struct quantity_cast_impl<To, CR, CRep, true, false> { struct quantity_cast_impl<To, CR, CRep, true, false> {
template<Quantity Q> template<Quantity Q>
requires treat_as_floating_point<CRep>
static constexpr To cast(const Q& q)
{
return To(static_cast<To::rep>(static_cast<CRep>(q.count()) * (CRep{1} / static_cast<CRep>(CR::den))));
}
template<Quantity Q>
requires !treat_as_floating_point<CRep>
static constexpr To cast(const Q& q) static constexpr To cast(const Q& q)
{ {
return To(static_cast<To::rep>(static_cast<CRep>(q.count()) / static_cast<CRep>(CR::den))); return To(static_cast<To::rep>(static_cast<CRep>(q.count()) / static_cast<CRep>(CR::den)));