Variable templates in the ODR
6.3 [basic.def.odr]
Richard Smith

Created on 2019-10-10.00:00:00 last changed 20 months ago


Date: 2019-10-15.00:00:00

Proposed resolution (October, 2019):

There can be more than one definition of a

  • class type (Clause 11 [class]),

  • enumeration type (9.7.1 [dcl.enum]),

  • inline function or variable with external linkage (9.2.8 [dcl.inline]),

  • inline variable with external linkage (9.2.8 [dcl.inline]),

  • class template (Clause 13 [temp]),

  • non-static function template (13.7.7 [temp.fct]),

  • concept (13.7.9 [temp.concept]),

  • static data member of a class template ( [temp.static]),

  • member function of a class template ( [temp.mem.func]),

  • template specialization for which some template parameters are not specified (13.9 [temp.spec], 13.7.6 [temp.spec.partial]),

  • templated entity (13.1 [temp.pre]),

  • default argument for a parameter (for a function in a given scope), or

  • default template argument

in a program provided that...

[Drafting note: “with external linkage” is not needed for the inline entities because the other cases - entities attached to a named module and multiple definitions in the same translation unit - are ruled out later in that paragraph.]
Date: 2019-11-15.00:00:00

[Adopted as a DR at the November, 2019 meeting.]

The list of entities in 6.3 [basic.def.odr] paragraph 12 that can have multiple definitions across translation units does not, but should, include variable templates.

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