Added useful concepts

src/concepts.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <concepts>
+#include <ranges>
+
+namespace gz::util {
+    /// Satisfied when T is in PackTypes
+    template<typename T, typename... PackTypes>
+    concept IsInPack = (std::same_as<T, PackTypes> || ...); 
+
+    template<typename T>
+    concept False = false;
+
+    /// Forward range holding integers
+    template<typename T>
+    concept IntegralForwardRange = std::ranges::forward_range<T> and std::integral<std::ranges::range_value_t<T>>;
+}
+
+/**
+ * @file
+ * @brief Concepts that might be useful elsewhere
+ */