feedc0de/mp-units
1
0
Fork 0
forked from mpusz/mp-units
Code Pull Requests Activity

feat: 💥 initial implementation of implicit point origins

Browse Source
This commit is contained in:
Mateusz Pusz
2023-12-21 12:25:09 +01:00
parent a114b9b9a3
commit 10a2e6dc0d
8 changed files with 108 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files
example/currency.cpp
+7 -8
View File
@@ -33,8 +33,6 @@ inline constexpr struct dim_currency : base_dimension<"$"> {} dim_currency;
QUANTITY_SPEC(currency, dim_currency);
constexpr struct zero : absolute_point_origin<zero, currency> {} zero;
inline constexpr struct euro : named_unit<"EUR", kind_of<currency>> {} euro;
inline constexpr struct us_dollar : named_unit<"USD", kind_of<currency>> {} us_dollar;
inline constexpr struct great_british_pound : named_unit<"GBP", kind_of<currency>> {} great_british_pound;
@@ -90,18 +88,19 @@ quantity<To, Rep> exchange_to(quantity<From, Rep> q)
template<ReferenceOf<currency> auto To, ReferenceOf<currency> auto From, auto PO, typename Rep>
quantity_point<To, PO, Rep> exchange_to(quantity_point<From, PO, Rep> q)
{
return quantity_point{zero + static_cast<Rep>(exchange_rate<q.unit, get_unit(To)>() *
(q - q.absolute_point_origin).numerical_value_in(q.unit)) *
To};
return quantity_point{
static_cast<Rep>(exchange_rate<q.unit, get_unit(To)>() * (q - q.absolute_point_origin).numerical_value_in(q.unit)) *
To};
}
int main()
{
using namespace unit_symbols;
quantity_point price_usd = zero + 100 * USD;
quantity_point price_usd{100 * USD};
quantity_point price_euro = exchange_to<euro>(price_usd);
std::cout << price_usd.quantity_from(zero) << " -> " << price_euro.quantity_from(zero) << "\n";
// std::cout << price_usd.quantity_from(zero) + price_euro.quantity_from(zero) << "\n"; // does not compile
std::cout << price_usd.quantity_from_zero() << " -> " << price_euro.quantity_from_zero() << "\n";
// std::cout << price_usd.quantity_from_zero() + price_euro.quantity_from_zero() << "\n"; // does
// not compile
}