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Update doc for struct field alignment. #8518

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Apr 14, 2021
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Update doc for struct field alignment. #8518

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19 changes: 17 additions & 2 deletions doc/langref.html.in
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Expand Up @@ -2763,9 +2763,24 @@ test "overaligned pointer to packed struct" {
cause the test suite to fail, notifying the bug fixer to update these docs.
</p>
<p>
It's also
<a href="https://github.com/ziglang/zig/issues/1512">planned to be able to set alignment of struct fields</a>.
It's also possible to set alignment of struct fields:
</p>
{#code_begin|test#}
const std = @import("std");
const expectEqual = std.testing.expectEqual;

test "aligned struct fields" {
const S = struct {
a: u32 align(2),
b: u32 align(64),
};
var foo = S{ .a = 1, .b = 2 };

expectEqual(64, @alignOf(S));
expectEqual(*align(2) u32, @TypeOf(&foo.a));
expectEqual(*align(64) u32, @TypeOf(&foo.b));
}
{#code_end#}
<p>
Using packed structs with {#link|volatile#} is problematic, and may be a compile error in the future.
For details on this subscribe to
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