includes/std: Added std::IIndexed as a nicer wrapper around std::core::array_index()

includes/std/array.pat

@@ -1,6 +1,7 @@
 #pragma once
 
 import std.sys;
+import std.core;
 
 /*!
     The array library contains a helper type to make it easier to create multi-dimensional arrays
@@ -30,6 +31,16 @@ namespace auto std {
         std::assert($ - startAddress == NumBytes, "Not enough bytes available to fit a whole number of types");
     } [[format("std::impl::format_array")]];
 
+
+    /**
+        An interface type for getting the index of the currently processed element in an array. This is a nice wrapper around `std::core::array_index()`
+
+        To use it, inherit from it and use the `this.index` field to get the index of the current element
+    */
+    struct IIndexed {
+        const u64 index = std::core::array_index();
+    };
+
     namespace impl {
 
         fn format_array(ref auto array) {