Added lots of small utilities

include/cpputils.h

@@ -0,0 +1,100 @@
+#pragma once
+
+// system includes
+#include <utility>
+#include <type_traits>
+
+namespace cpputils {
+namespace literals {
+namespace {
+/**
+ * User-defined Literals
+ *  usage:
+ *
+ *   uint32_t = test = 10_MHz; // --> 10000000
+ */
+
+constexpr unsigned long long operator"" _kHz(unsigned long long x)
+{
+    return x * 1000;
+}
+
+constexpr unsigned long long operator"" _MHz(unsigned long long x)
+{
+    return x * 1000 * 1000;
+}
+
+constexpr unsigned long long operator"" _GHz(unsigned long long x)
+{
+    return x * 1000 * 1000 * 1000;
+}
+
+constexpr unsigned long long operator"" _kBit(unsigned long long x)
+{
+    return x * 1024;
+}
+
+constexpr unsigned long long operator"" _MBit(unsigned long long x)
+{
+    return x * 1024 * 1024;
+}
+
+constexpr unsigned long long operator"" _GBit(unsigned long long x)
+{
+    return x * 1024 * 1024 * 1024;
+}
+
+constexpr unsigned long long operator"" _kB(unsigned long long x)
+{
+    return x * 1024;
+}
+
+constexpr unsigned long long operator"" _MB(unsigned long long x)
+{
+    return x * 1024 * 1024;
+}
+
+constexpr unsigned long long operator"" _GB(unsigned long long x)
+{
+    return x * 1024 * 1024 * 1024;
+}
+} // namespace
+} // namespace literals
+
+namespace {
+template<typename T>
+T vmin(T&&t)
+{
+    return std::forward<T>(t);
+}
+
+template<typename T0, typename T1, typename... Ts>
+typename std::common_type<T0, T1, Ts...>::type vmin(T0&& val1, T1&& val2, Ts&&... vs)
+{
+    if (val1 < val2)
+        return vmin(val1, std::forward<Ts>(vs)...);
+    else
+        return vmin(val2, std::forward<Ts>(vs)...);
+}
+
+template<class T>
+constexpr const T& clamp( const T& v, const T& lo, const T& hi )
+{
+    // assert( !(hi < lo) );
+    return (v < lo) ? lo : (hi < v) ? hi : v;
+}
+
+template<typename T>
+T mapValue(T x, T in_min, T in_max, T out_min, T out_max)
+{
+    return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+}
+
+template<typename First, typename ... T>
+bool is_in(First &&first, T && ... t)
+{
+    return ((first == t) || ...);
+}
+
+} // namespace
+} // namespace cpputils