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Diffstat (limited to 'lib/std/multi_array_list.zig')
| -rw-r--r-- | lib/std/multi_array_list.zig | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/std/multi_array_list.zig b/lib/std/multi_array_list.zig index 341ca6931e..279a150799 100644 --- a/lib/std/multi_array_list.zig +++ b/lib/std/multi_array_list.zig @@ -135,6 +135,22 @@ pub fn MultiArrayList(comptime T: type) type { self.* = undefined; } + /// Returns a `Slice` representing a range of elements in `s`, analagous to `arr[off..len]`. + /// It is illegal to call `deinit` or `toMultiArrayList` on the returned `Slice`. + /// Asserts that `off + len <= s.len`. + pub fn subslice(s: Slice, off: usize, len: usize) Slice { + assert(off + len <= s.len); + var ptrs: [fields.len][*]u8 = undefined; + inline for (s.ptrs, &ptrs, fields) |in, *out, field| { + out.* = in + (off * @sizeOf(field.type)); + } + return .{ + .ptrs = ptrs, + .len = len, + .capacity = len, + }; + } + /// This function is used in the debugger pretty formatters in tools/ to fetch the /// child field order and entry type to facilitate fancy debug printing for this type. fn dbHelper(self: *Slice, child: *Elem, field: *Field, entry: *Entry) void { |