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quantity_cast refactored

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- new version with ToD added
- <ToU, Rep> version removed
This commit is contained in:
Mateusz Pusz
2019-12-08 16:24:29 +01:00
parent d465d47803
commit 6b4220100f
2 changed files with 8 additions and 10 deletions
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2
example/avg_velocity.cpp
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@@ -123,7 +123,7 @@ void example()
// conversion from a floating-point to an integral type is a truncating one so an explicit cast is needed
// also it is not possible to make a lossless conversion of miles to meters on an integral type
// (explicit cast needed)
print_result(distance, duration, fixed_int_si_avg_speed(quantity_cast<si::metre, int>(distance), quantity_cast<int>(duration)));
print_result(distance, duration, fixed_int_si_avg_speed(quantity_cast<si::length<si::metre, int>>(distance), quantity_cast<int>(duration)));
print_result(distance, duration, fixed_double_si_avg_speed(distance, duration));
print_result(distance, duration, si_avg_speed(distance, duration));

16
src/include/units/quantity.h
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@@ -164,19 +164,17 @@ template<Quantity To, typename D, typename U, typename Rep>
* Implicit conversions between quantities of different types are allowed only for "safe"
* (i.e. non-truncating) conversion. In such cases an explicit cast have to be used.
*
* This cast gets both the target unit and representation to cast to. For example:
* This cast gets only the target dimension to cast to. For example:
*
* auto q1 = units::quantity_cast<units::second, int>(1ms);
* auto q1 = units::quantity_cast<units::si::acceleration>(200Gal);
*
* @tparam ToU a unit type to use for a target quantity
* @tparam ToRep a representation type to use for a target quantity
* @tparam ToD a dimension type to use for a target quantity
*/
template<Unit ToU, Scalar ToRep, typename D, typename U, typename Rep>
template<Dimension ToD, typename D, typename U, typename Rep>
[[nodiscard]] constexpr auto quantity_cast(const quantity<D, U, Rep>& q)
requires UnitOf<ToU, D> &&
detail::basic_arithmetic<std::common_type_t<ToRep, Rep, intmax_t>>
requires same_dim<ToD, D>
{
return quantity_cast<quantity<D, ToU, ToRep>>(q);
return quantity_cast<quantity<ToD, U, Rep>>(q);
}
/**
@@ -187,7 +185,7 @@ template<Unit ToU, Scalar ToRep, typename D, typename U, typename Rep>
*
* This cast gets only the target unit to cast to. For example:
*
* auto q1 = units::quantity_cast<units::second>(1ms);
* auto q1 = units::quantity_cast<units::si::second>(1ms);
*
* @tparam ToU a unit type to use for a target quantity
*/