first pass compile time optimization

src/misc/bitwise.hpp

@@ -0,0 +1,38 @@
+#pragma once
+#include <type_traits>
+
+template<typename T>
+struct Bitwise {
+    static const bool enable = false;
+};
+
+template<typename T>
+typename std::enable_if<Bitwise<T>::enable, T>::type operator|(T a, T b) {
+    using x = typename std::underlying_type<T>::type;
+    return static_cast<T>(static_cast<x>(a) | static_cast<x>(b));
+}
+
+template<typename T>
+typename std::enable_if<Bitwise<T>::enable, T>::type operator|=(T &a, T b) {
+    using x = typename std::underlying_type<T>::type;
+    a = static_cast<T>(static_cast<x>(a) | static_cast<x>(b));
+    return a;
+}
+
+template<typename T>
+typename std::enable_if<Bitwise<T>::enable, T>::type operator&(T a, T b) {
+    using x = typename std::underlying_type<T>::type;
+    return static_cast<T>(static_cast<x>(a) & static_cast<x>(b));
+}
+
+template<typename T>
+typename std::enable_if<Bitwise<T>::enable, T>::type operator&=(T &a, T b) {
+    using x = typename std::underlying_type<T>::type;
+    a = static_cast<T>(static_cast<x>(a) & static_cast<x>(b));
+    return a;
+}
+
+template<typename T>
+typename std::enable_if<Bitwise<T>::enable, T>::type operator~(T a) {
+    return static_cast<T>(~static_cast<typename std::underlying_type<T>::type>(a));
+}

src/misc/is_optional.hpp

@@ -0,0 +1,9 @@
+#pragma once
+#include <optional>
+#include <type_traits>
+
+template<typename T>
+struct is_optional : std::false_type {};
+
+template<typename T>
+struct is_optional<std::optional<T>> : std::true_type {};