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xo-unit: + unary Quantity.operator-

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This commit is contained in:
Roland Conybeare 2024-04-27 11:10:55 -04:00
commit 8d1bdf5463
2 changed files with 8 additions and 0 deletions
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4
include/xo/unit/Quantity.hpp
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@ -195,6 +195,10 @@ namespace xo {
return x.scale() <=> y2.scale();
}
Quantity operator-() const {
return Quantity(-scale_, unit_);
}
/* also works with Quantity2 = double, int, .. */
template <typename Quantity2>
Quantity & operator*= (const Quantity2 & x) {

4
utest/Quantity.test.cpp
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@ -340,6 +340,10 @@ namespace xo {
auto q1_minus_q2 = q1 - q2;
REQUIRE(q1_minus_q2.unit() == q1.unit());
REQUIRE(q1_minus_q2.scale() == Approx(1.0 - k2).epsilon(1.0e-6));
auto q1_neg = -q1;
REQUIRE(q1_neg.unit() == q1.unit());
REQUIRE(q1_neg.scale() == -q1.scale());
}
}
}