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std::is_assignable_v<Dest&, Source> should be wrapped in concept X4Assignable #64

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#111
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std::is_assignable_v<Dest&, Source> should be wrapped in concept X4Assignable#64
#111
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enhancementNew feature or request

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@saki7
saki7
opened on Mar 4, 2026

MSVC usually omits the expansion of actual template arguments when the plain metafunction is used. Using concept somehow enforces MSVC to always emit the actual types, which is a great QoL improvement.

Plain std::is_assignable_v<Dest&, Source> (current main branch)

Image

With X4Assignable

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  1. saki7
    added
    enhancementNew feature or request
    on Mar 4, 2026

  2. saki7 commented on Mar 4, 2026

    @saki7
    saki7
    on Mar 4, 2026
    MemberAuthor

    Note: std::assignable_from is NOT the same as std::is_assignable_v and cannot be used for this purpose.

  3. saki7 commented on Mar 4, 2026

    @saki7
    saki7
    on Mar 4, 2026
    MemberAuthor

    This can be fixed any time, but I think the changes would conflict with #61 and #42 so I'm waiting for those PRs to be finished

  4. saki7
    closed this as completedin #111on Oct 2, 2026
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