From b46cbe7b2f31d0f4ea5e720f2d3657437b22e6c7 Mon Sep 17 00:00:00 2001
From: Meghan Denny <hello@nektro.net>
Date: Tue, 15 Apr 2025 03:14:41 -0700
Subject: [PATCH] add MultiArray

---
 src/MultiArray.zig | 44 ++++++++++++++++++++++++++++++++++++++++++++
 src/lib.zig        |  1 +
 2 files changed, 45 insertions(+)
 create mode 100644 src/MultiArray.zig

diff --git a/src/MultiArray.zig b/src/MultiArray.zig
new file mode 100644
index 0000000000000000000000000000000000000000..5154699aa502ebd9e8eb90a1dbc33f4d279c3f95
--- /dev/null
+++ b/src/MultiArray.zig
@@ -0,0 +1,44 @@
+const std = @import("std");
+const string = []const u8;
+const extras = @import("./lib.zig");
+const StructOfSlices = extras.StructOfSlices;
+const StructOfArrays = extras.StructOfArrays;
+const expectSimilarType = extras.expectSimilarType;
+
+pub fn MultiArray(T: type) type {
+    return struct {
+        items: StructOfSlices(T),
+
+        pub fn initComptime(comptime data: []const T) @This() {
+            return comptime blk: {
+                var temp: StructOfArrays(data.len, T) = undefined;
+                for (data, 0..) |item, i| {
+                    for (std.meta.fieldNames(T)) |name| {
+                        @field(temp, name)[i] = @field(item, name);
+                    }
+                }
+                var result: @This() = undefined;
+                for (std.meta.fields(T)) |field| {
+                    const constant = @field(temp, field.name)[0..data.len].*;
+                    @field(result.items, field.name) = &constant;
+                }
+                break :blk result;
+            };
+        }
+    };
+}
+
+test {
+    try expectSimilarType(
+        MultiArray(struct {
+            x: u8,
+            y: u16,
+        }),
+        struct {
+            items: struct {
+                x: []const u8,
+                y: []const u16,
+            },
+        },
+    );
+}
diff --git a/src/lib.zig b/src/lib.zig
index 274c340ca504191044ad7fff70c9fb548d8d843f..99a78ab8186200b813d268d1fb3f3aab4d028637 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -107,3 +107,4 @@ pub usingnamespace @import("./hasFn.zig");
 pub usingnamespace @import("./hasFields.zig");
 pub usingnamespace @import("./StructOfSlices.zig");
 pub usingnamespace @import("./StructOfArrays.zig");
+pub usingnamespace @import("./MultiArray.zig");
-- 
2.54.0