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Merge branch 'master' of github.com:mpusz/mp-units

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Mateusz Pusz
2023-12-16 12:46:55 +01:00
parent 0811ac0ca2 462b4180f4
commit ffba606115
3 changed files with 46 additions and 0 deletions
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31
src/utility/include/mp-units/math.h
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@@ -136,6 +136,37 @@ template<auto R, typename Rep>
return {static_cast<Rep>(abs(q.numerical_value_ref_in(q.unit))), R};
}
/**
* @brief Computes the fma of 3 quantities
*
* @param a: Multiplicand
* @param x: Multiplicand
* @param b: Addend
* @return Quantity: The nearest floating point representable to ax+b
*/
template<auto R, auto S, auto T, typename Rep1, typename Rep2, typename Rep3>
[[nodiscard]] constexpr QuantityOf<common_quantity_spec(get_quantity_spec(R) * get_quantity_spec(S),
get_quantity_spec(T))> auto
fma(const quantity<R, Rep1>& a, const quantity<S, Rep2>& x, const quantity<T, Rep3>& b) noexcept
requires requires { common_quantity_spec(get_quantity_spec(R) * get_quantity_spec(S), get_quantity_spec(T)); } &&
(get_unit(R) * get_unit(S) == get_unit(T)) &&
(
requires {
fma(a.numerical_value_ref_in(a.unit), x.numerical_value_ref_in(x.unit),
b.numerical_value_ref_in(b.unit));
} ||
requires {
std::fma(a.numerical_value_ref_in(a.unit), x.numerical_value_ref_in(x.unit),
b.numerical_value_ref_in(b.unit));
})
{
using std::fma;
return quantity{
fma(a.numerical_value_ref_in(a.unit), x.numerical_value_ref_in(x.unit), b.numerical_value_ref_in(b.unit)),
common_reference(R * S, T)};
}
/**
* @brief Returns the epsilon of the quantity
*

11
test/unit_test/runtime/math_test.cpp
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@@ -62,6 +62,17 @@ TEST_CASE("'cbrt()' on quantity changes the value and the dimension accordingly"
REQUIRE(cbrt(8 * isq::volume[m3]) == 2 * isq::length[m]);
}
TEST_CASE("'fma()' on quantity changes the value and the dimension accordingly", "[math][fma]")
{
REQUIRE(fma(1.0 * isq::length[m], 2.0 * one, 2.0 * isq::length[m]) == 4.0 * isq::length[m]);
}
TEST_CASE("'fma()' returns a common reference.", "[math][fma]")
{
REQUIRE(fma(isq::speed(10.0 * m / s), isq::time(2.0 * s), isq::height(42.0 * m)) == isq::length(62.0 * m));
}
TEST_CASE("'pow<Num, Den>()' on quantity changes the value and the dimension accordingly", "[math][pow]")
{
REQUIRE(pow<1, 4>(16 * isq::area[m2]) == sqrt(4 * isq::length[m]));

4
test/unit_test/static/math_test.cpp
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@@ -40,6 +40,10 @@ template<typename T1, typename T2, typename... Ts>
#if __cpp_lib_constexpr_cmath || MP_UNITS_COMP_GCC
static_assert(compare(fma(2.0 * s, 3.0 * Hz, 1.0 * one), 7.0 * one));
static_assert(compare(fma(2.0 * one, 3.0 * m, 1.0 * m), 7.0 * m));
static_assert(compare(fma(2.0 * m, 3.0 * one, 1.0 * m), 7.0 * m));
static_assert(compare(fma(2 * m, 3.0f * m, 1.0 * m2), 7.0 * m2));
static_assert(compare(pow<0>(2 * m), 1 * one));
static_assert(compare(pow<1>(2 * m), 2 * m));
static_assert(compare(pow<2>(2 * m), 4 * pow<2>(m), 4 * m2));