math: add dot() for quaternions, plus the relevant unit test.

src/lol/math/vector.h

@@ -1217,10 +1217,7 @@ static inline Quat<T> operator /(Quat<T> x, Quat<T> const &y)
     DECLARE_SCALAR_VECTOR_COERCE_OP(tname, *, tprefix, t1, t2, tf) \
     \
     DECLARE_VECTOR_VECTOR_BOOLOP(tname, ==, ==, true, tprefix, t1, t2) \
-    DECLARE_VECTOR_VECTOR_BOOLOP(tname, !=, ==, false, tprefix, t1, t2)
-
-#define DECLARE_BINARY_VECTOR_COERCE_OPS(tname, tprefix, t1, t2, tf) \
-    DECLARE_SCALAR_VECTOR_COERCE_OP(tname, /, tprefix, t1, t2, tf) \
+    DECLARE_VECTOR_VECTOR_BOOLOP(tname, !=, ==, false, tprefix, t1, t2) \
     \
     tprefix \
     inline tf dot(tname<t1> const &a, tname<t2> const &b) \
@@ -1231,6 +1228,9 @@ static inline Quat<T> operator /(Quat<T> x, Quat<T> const &y)
         return ret; \
     }
 
+#define DECLARE_BINARY_VECTOR_COERCE_OPS(tname, tprefix, t1, t2, tf) \
+    DECLARE_SCALAR_VECTOR_COERCE_OP(tname, /, tprefix, t1, t2, tf)
+
 #define DECLARE_VEC_3_COERCE_OPS(tname, tprefix, t1, t2, tf) \
     tprefix \
     inline tname<tf> cross(tname<t1> const &a, tname<t2> const &b) \
@@ -1354,7 +1354,7 @@ DECLARE_ALL_VECTOR_OPS(uint64_t)
 #endif
 
 /* Hack for compilation speedups: we can hide some of our global methods in
- * namespaces. We therefore want "long_double" to be a one-symbol type */
+ * namespaces. We therefore want "long_double" to be a single-word name */
 typedef long double long_double;
 
 /* Apply the same coercion rules as in the C++ standard. However, instead

test/unit/quat.cpp

@@ -79,6 +79,14 @@ LOLUNIT_FIXTURE(QuaternionTest)
         LOLUNIT_ASSERT_EQUAL(norm(a * d), norm(a) * norm(d));
     }
 
+    LOLUNIT_TEST(Dot)
+    {
+        quat a(-1.f, 2.f, -3.f, 4.f);
+        quat b(8.f, 7.f, 6.f, 5.f);
+
+        LOLUNIT_ASSERT_EQUAL(dot(a, b), 8.f);
+    }
+
     LOLUNIT_TEST(Base)
     {
         quat one(1.f, 0.f, 0.f, 0.f);