feat add clamp

src/ulib/utils/utils.h

@@ -0,0 +1,22 @@
+#ifndef ULIB_SRC_ULIB_UTILS_UTILS_H_
+#define ULIB_SRC_ULIB_UTILS_UTILS_H_
+
+#include <functional>
+
+namespace ulib {
+template<typename T>
+const T &
+Clamp(const T &value, const T &low, const T &high)
+{
+    return Clamp(value, low, high, std::less<T>{});
+}
+
+template<typename T, typename Comp>
+const T &
+Clamp(const T &value, const T &low, const T &high, Comp comp)
+{
+    return comp(value, low) ? low : (comp(high, value) ? high : value);
+}
+
+}// namespace ulib
+#endif//  ULIB_SRC_ULIB_UTILS_UTILS_H_