Add getMemberAttributes and getMemberType traits#22545
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CyberShadow wants to merge 1 commit intodlang:masterfrom
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Add getMemberAttributes and getMemberType traits#22545CyberShadow wants to merge 1 commit intodlang:masterfrom
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New lightweight traits for member introspection that use sym.search() instead of full expressionSemantic, avoiding circular dependency errors when iterating allMembers on types with auto-return methods. __traits(getMemberAttributes, T, "name") returns UDAs on the named member. __traits(getMemberType, T, "name") returns the member's type, usable in is() expressions for return type extraction, function type checks, etc. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Thanks for your pull request, @CyberShadow! 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. Testing this PR locallyIf you don't have a local development environment setup, you can use Digger to test this PR: dub run digger -- build "master + dmd#22545" |
CyberShadow
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Feb 9, 2026
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| if (fd.overnext) | ||
| { | ||
| deprecation(e.loc, "`__traits(getMemberAttributes)` may only be used for individual functions, not the overload set `%s`", fd.toChars()); | ||
| deprecationSupplemental(e.loc, "the result of `__traits(getOverloads)` may be used to select the desired function to extract attributes from"); | ||
| } |
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Seems weird to emit deprecation warnings from a new feature. However, this is what getMember does today, so this copies its behavior to remain consistent.
Which does raise the question of what to do with overload sets. We could also add getOverloadAttributes, getOverloadType, etc. granting the same benefit as this (eliding full semantic analysis), but it becomes a quadratic explosion of traits.
This was referenced Feb 9, 2026
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Generated by Claude Opus 4.6, usual disclaimers apply.
Alternative to #22541 / #22542.
CC @dkorpel
New lightweight traits for member introspection that use
sym.search()instead of fullexpressionSemantic, avoiding circular dependency errors when iterating allMembers on types with auto-return methods.__traits(getMemberAttributes, T, "name")returns UDAs on the named member.__traits(getMemberType, T, "name")returns the member's type, usable inis()expressions for return type extraction, function type checks, etc.