add + unary operator to angle

Author: SizzinSeal

include/units/Angle.hpp

@@ -43,7 +43,9 @@ class CAngle : public Quantity<std::ratio<0>, std::ratio<0>, std::ratio<0>, std:
         // make CAngle able to be implicitly converted to Angle
         constexpr operator Angle() const { return Angle(M_PI_2 - this->value); }
 
-        constexpr Angle operator-() const { return Angle(M_PI_2 - this->value); }
+        constexpr CAngle operator-() const { return CAngle(-this->value); }
+
+        constexpr CAngle operator+() const { return CAngle(this->value); }
     private:
         // only allow construction through literals
         constexpr CAngle(double value)

src/main.cpp

@@ -56,7 +56,9 @@ void initialize() {
 }
 
 void angleTests() {
-    static_assert(15_cDeg == 75_stDeg);
-    static_assert(-15_cDeg == 75_stDeg);
+    static_assert(+15_cDeg == 75_stDeg);
+    static_assert(to_stDeg(-15_cDeg) == to_stDeg(105_stDeg));
     static_assert(r2i(to_stDeg(2 * 15_cDeg)) == r2i(to_stDeg(60_stDeg)));
+    static_assert(r2i(to_stDeg(+0_cDeg)) == r2i(to_stDeg(90_stDeg)));
+    static_assert(90_stDeg == +0_cDeg);
 }