[core] Privatize math.hpp and vec.hpp

test/math/clamp.cpp

@@ -0,0 +1,24 @@
+#include <mbgl/test/util.hpp>
+
+#include <mbgl/util/constants.hpp>
+#include <mbgl/math/clamp.hpp>
+
+using namespace mbgl;
+
+TEST(Math, ClampFloatingPoint) {
+    double lowestValue = std::numeric_limits<double>::lowest();
+    double maximumValue = std::numeric_limits<double>::max();
+    double quietNAN = std::numeric_limits<double>::quiet_NaN();
+
+    ASSERT_DOUBLE_EQ(0., util::clamp(0., quietNAN, quietNAN));
+    ASSERT_DOUBLE_EQ(0., util::clamp(0., lowestValue, maximumValue));
+}
+
+TEST(Math, ClampIntegral) {
+    int32_t lowestValue = std::numeric_limits<int32_t>::lowest();
+    int32_t maximumValue = std::numeric_limits<int32_t>::max();
+    int32_t quietNAN = std::numeric_limits<int32_t>::quiet_NaN();
+
+    ASSERT_EQ(0, util::clamp(0, quietNAN, quietNAN));
+    ASSERT_EQ(0, util::clamp(0, lowestValue, maximumValue));
+}