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### 1020. Restore `aligned_union`

Section: 21.3.8.7 [meta.trans.other] Status: NAD Submitter: Alisdair Meredith Opened: 2009-03-11 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Addresses UK 204 [CD1]

It is not possible to create a variant union based on a parameter pack expansion, e.g. to implement a classic discriminated union template.

Original proposed resolutuion:

Restore `aligned_union` template that was removed by LWG issue 856.

[ Summit: ]

> Agree. The need for `aligned_union` is compelling enough to reinstate.

[ Post Summit, Alisdair adds: ]

> Paper N2843 proposes an extension to the `[[align]]` attribute that further diminishes the need for this template. Recommend NAD.

[ 2009-10 Santa Cruz: ]

> Mark NAD as suggested.

Proposed resolution: