Add a tuple manipulation header

build.zig.zon

@@ -1,5 +1,5 @@
 .{
     .name = "blackmagic",
-    .version = "0.2.0",
+    .version = "0.3.0",
     .paths = .{ "build.zig", "build.zig.zon", "include", "README.md", "LICENSE" },
 }

include/blackmagic/tuple.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "blackmagic/token.h" // CONCAT
+
+/**
+ * @file
+ * Manipulate tuples
+ */
+
+/** Extract the first element of a tuple */
+#define TUPLE_FIRST(A, ...) A
+/** Extract the second element of a tuple */
+#define TUPLE_SECOND(A, B, ...) B
+/** Extract the third element of a tuple */
+#define TUPLE_THIRD(A, B, C, ...) C
+
+/** Extract the Nth element of a tuple */
+#define TUPLE_GET(N, TUPLE) CONCAT(TUPLE_GET_, N) TUPLE
+
+#define TUPLE_GET_0(A, ...) A
+#define TUPLE_GET_1(A,B, ...) B
+#define TUPLE_GET_2(A,B,C, ...) C
+#define TUPLE_GET_3(A,B,C,D, ...) D
+#define TUPLE_GET_4(A,B,C,D,E, ...) E
+#define TUPLE_GET_5(A,B,C,D,E,F, ...) F
+#define TUPLE_GET_6(A,B,C,D,E,F,G, ...) G