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feat: qp1.quantity_from(qp2) added

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Mateusz Pusz
2024-06-25 14:07:08 -05:00
parent fc1c11cd96
commit 90d8fda327
3 changed files with 19 additions and 2 deletions
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4
example/unmanned_aerial_vehicle.cpp
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@@ -149,7 +149,7 @@ public:
void current(msl_altitude alt) { current_ = alt; } void current(msl_altitude alt) { current_ = alt; }
[[nodiscard]] msl_altitude current() const { return current_; } [[nodiscard]] msl_altitude current() const { return current_; }
[[nodiscard]] hal_altitude hal() const { return height_above_launch + (current_ - launch_); } [[nodiscard]] hal_altitude hal() const { return height_above_launch + current_.quantity_from(launch_); }
}; };
@@ -164,7 +164,7 @@ int main()
std::cout << MP_UNITS_STD_FMT::format("hal = {::N[.2f]}\n", uav.hal()); std::cout << MP_UNITS_STD_FMT::format("hal = {::N[.2f]}\n", uav.hal());
const msl_altitude ground_level = mean_sea_level + 123 * m; const msl_altitude ground_level = mean_sea_level + 123 * m;
std::cout << MP_UNITS_STD_FMT::format("agl = {::N[.2f]}\n", uav.current() - ground_level); std::cout << MP_UNITS_STD_FMT::format("agl = {::N[.2f]}\n", uav.current().quantity_from(ground_level));
struct waypoint { struct waypoint {
std::string name; std::string name;

6
src/core/include/mp-units/framework/quantity_point.h
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@@ -256,6 +256,12 @@ public:
return *this - PO2{}; return *this - PO2{};
} }
template<QuantityPointOf<absolute_point_origin> QP>
[[nodiscard]] constexpr Quantity auto quantity_from(const QP& qp) const
{
return *this - qp;
}
[[nodiscard]] constexpr Quantity auto quantity_from_zero() const [[nodiscard]] constexpr Quantity auto quantity_from_zero() const
{ {
if constexpr (requires { unit.point_origin; }) { if constexpr (requires { unit.point_origin; }) {

11
test/static/quantity_point_test.cpp
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@@ -1439,6 +1439,17 @@ static_assert((ground_level + 42 * m) - (other_ground_level + 42 * m) == -81 * m
static_assert((other_ground_level + 42 * m) - (tower_peak + 42 * m) == 39 * m); static_assert((other_ground_level + 42 * m) - (tower_peak + 42 * m) == 39 * m);
static_assert((tower_peak + 42 * m) - (other_ground_level + 42 * m) == -39 * m); static_assert((tower_peak + 42 * m) - (other_ground_level + 42 * m) == -39 * m);
static_assert((mean_sea_level + 42 * m).quantity_from(ground_level + 42 * m) == -42 * m);
static_assert((ground_level + 42 * m).quantity_from(mean_sea_level + 42 * m) == 42 * m);
static_assert((tower_peak + 42 * m).quantity_from(ground_level + 42 * m) == 42 * m);
static_assert((ground_level + 42 * m).quantity_from(tower_peak + 42 * m) == -42 * m);
static_assert((tower_peak + 42 * m).quantity_from(mean_sea_level + 42 * m) == 84 * m);
static_assert((mean_sea_level + 42 * m).quantity_from(tower_peak + 42 * m) == -84 * m);
static_assert((other_ground_level + 42 * m).quantity_from(ground_level + 42 * m) == 81 * m);
static_assert((ground_level + 42 * m).quantity_from(other_ground_level + 42 * m) == -81 * m);
static_assert((other_ground_level + 42 * m).quantity_from(tower_peak + 42 * m) == 39 * m);
static_assert((tower_peak + 42 * m).quantity_from(other_ground_level + 42 * m) == -39 * m);
static_assert((mean_sea_level + 42 * m).quantity_from(mean_sea_level) == 42 * m); static_assert((mean_sea_level + 42 * m).quantity_from(mean_sea_level) == 42 * m);
static_assert((42 * m + mean_sea_level).quantity_from(mean_sea_level) == 42 * m); static_assert((42 * m + mean_sea_level).quantity_from(mean_sea_level) == 42 * m);
static_assert((mean_sea_level - 42 * m).quantity_from(mean_sea_level) == -42 * m); static_assert((mean_sea_level - 42 * m).quantity_from(mean_sea_level) == -42 * m);