fix #10840 writeln() of bitfields #10851
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Thanks for your pull request, @WalterBright! Bugzilla referencesYour PR doesn't reference any Bugzilla issue. If your PR contains non-trivial changes, please reference a Bugzilla issue or create a manual changelog.
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@ibuclaw please review and merge. |
ibuclaw
approved these changes
Aug 27, 2025
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| * However, the overlap | ||
| * check in general does not take into account staggered unions. | ||
| * This can be fixed using the correct algorithm implemented in | ||
| * the compiler function dmd.declaration.isOverlappedWith(). |
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FYI tracking this issue with staggered unions in #10844
| { | ||
| static if (i == T.tupleof.length - 1 || T.tupleof[i].offsetof != T.tupleof[i+1].offsetof) | ||
| static if (i == T.tupleof.length - 1 || | ||
| T.tupleof[i ].offsetof * 8 + __traits(getBitfieldOffset,T.tupleof[i ]) != |
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I didn't realise getBitfieldOffset worked for non-bitfields.
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I implemented it that way for exactly this reason! It greatly simplifies the overlap logic. You'll see the same thing in the dmd source code, as referenced.
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Fixes Issue #10840
This fix is blocking dlang/dmd#21625