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Optimized floating point unit conversions

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- Divisions are now made at compile time.
- Only runtime multiplications are left.
This commit is contained in:
Jan Sende
2019-09-30 23:38:33 +02:00
committed by GitHub
parent 56679498b7
commit a11f5a92b6
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>
struct quantity_cast_impl {
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)
{
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>
struct quantity_cast_impl<To, CR, CRep, true, false> {
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)
{
return To(static_cast<To::rep>(static_cast<CRep>(q.count()) / static_cast<CRep>(CR::den)));