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### 2581. Specialization of `<type_traits>` variable templates should be prohibited

Section: 21.3.3 [meta.type.synop] Status: C++17 Submitter: Tim Song Opened: 2016-01-07 Last modified: 2017-07-30

Priority: 0

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Discussion:

21.3.3 [meta.type.synop]/1 only prohibits adding specializations of class templates in `<type_traits>`. Now that we have `_v` variable templates, this prohibition should apply to them as well.

[2016-02, Issues Telecon]

P0; move to Tentatively Ready.

Proposed resolution:

This wording is relative to N4567.

1. Edit 21.3.3 [meta.type.synop]/1 as indicated:

   > -1- The behavior of a program that adds specializations for any of the class templates defined in this subclause is undefined unless otherwise specified.