Math: added vector/scalar abs() function.

src/Math/Functions.h

@@ -117,6 +117,21 @@ template<std::size_t size, class T> Vector<size, T> max(const Vector<size, T>& a
 }
 #endif
 
+/** @brief Absolute value */
+#ifdef DOXYGEN_GENERATING_OUTPUT
+template<class T> inline T abs(const T& a);
+#else
+template<class T> inline typename std::enable_if<std::is_arithmetic<T>::value, T>::type abs(T a) {
+    return std::abs(a);
+}
+template<std::size_t size, class T> Vector<size, T> abs(const Vector<size, T>& a) {
+    Vector<size, T> out;
+    for(std::size_t i = 0; i != size; ++i)
+        out[i] = std::abs(a[i]);
+    return out;
+}
+#endif
+
 /**
 @brief Clamp value
 

src/Math/Test/FunctionsTest.cpp

@@ -26,6 +26,7 @@ class FunctionsTest: public Corrade::TestSuite::Tester {
 
         void min();
         void max();
+        void abs();
         void clamp();
         void normalizeUnsigned();
         void normalizeSigned();
@@ -47,6 +48,7 @@ typedef Math::Vector3<std::int32_t> Vector3i;
 FunctionsTest::FunctionsTest() {
     addTests(&FunctionsTest::min,
              &FunctionsTest::max,
+             &FunctionsTest::abs,
              &FunctionsTest::clamp,
              &FunctionsTest::normalizeUnsigned,
              &FunctionsTest::normalizeSigned,
@@ -69,6 +71,12 @@ void FunctionsTest::max() {
     CORRADE_COMPARE(Math::max(Vector3i(5, -3, 2), Vector3i(9, -5, 18)), Vector3i(9, -3, 18));
 }
 
+void FunctionsTest::abs() {
+    CORRADE_COMPARE(Math::abs(-5), 5);
+    CORRADE_COMPARE(Math::abs(5), 5);
+    CORRADE_COMPARE(Math::abs(Vector3i(5, -3, 2)), Vector3i(5, 3, 2));
+}
+
 void FunctionsTest::clamp() {
     CORRADE_COMPARE(Math::clamp(0.5f, -1.0f, 5.0f), 0.5f);
     CORRADE_COMPARE(Math::clamp(-1.6f, -1.0f, 5.0f), -1.0f);