From 5e3a2492c7bb73daa4e27398daaf490d09980ff3 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Wed, 22 Jun 2022 17:41:59 -0400
Subject: Base system viewer with data loaded from csv files

---
 include/util.hpp | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 include/util.hpp

(limited to 'include/util.hpp')

diff --git a/include/util.hpp b/include/util.hpp
new file mode 100644
index 0000000..3c795d1
--- /dev/null
+++ b/include/util.hpp
@@ -0,0 +1,45 @@
+#include <type_traits>
+#ifndef UTIL_HPP
+#define UTIL_HPP 1
+
+#include <variant>
+#include <cstddef>
+
+#if UNICODE == 1
+using screenchr = wchar_t;
+#else
+using screenchr = char;
+#endif
+
+/*Shamelessly stolen from stackoverflow
+ * https://stackoverflow.com/questions/52303316/get-index-by-type-in-stdvariant
+ * by Barry*/
+template <typename> struct tag { };
+template <typename T, typename V>
+struct get_index;
+template <typename T, typename... Ts> 
+struct get_index<T, std::variant<Ts...>>
+    : std::integral_constant<size_t, std::variant<tag<Ts>...>(tag<T>()).index()>
+{ };
+
+template<typename T, typename variant_type>
+struct is_variant : std::false_type {};
+template<typename T, typename ... Vs>
+struct is_variant<T, std::variant<Vs...>>
+   : std::disjunction<std::is_same<T, Vs>...> {};
+template<typename T, typename variant_type>
+constexpr bool is_variant_v = is_variant<T, variant_type>::value;
+
+template<typename T, unsigned base, unsigned p>
+struct cxpow { static constexpr T value = (T)base * cxpow<T, base, p - 1>::value; };
+template<typename T, unsigned base>
+struct cxpow<T, base, 0> { static constexpr T value = 1; };
+template<typename T, unsigned base, unsigned p>
+constexpr T cxpow_v = cxpow<T, base, p>::value;
+
+template<typename T, unsigned base, int p>
+struct cxrt { static constexpr T value = (T)base / cxpow<T, base, -p>::value; };
+template<typename T, unsigned base, int p>
+constexpr T cxrt_v = cxrt<T, base, p>::value;
+
+#endif
-- 
cgit v1.2.1