This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 116a. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.

2024-12-19

2305. Explicit instantiation of constexpr or inline variable template

[Accepted as a DR at the November, 2017 meeting.]

According to 13.9.3 [temp.explicit] paragraph 1,

An explicit instantiation of a function template or member function of a class template shall not use the inline or constexpr specifiers.

Should this apply to explicit specializations of variable templates as well?

(See also issues 1704 and 1728).

Proposed resolution (August, 2017):

Change 13.9.3 [temp.explicit] paragraph 1 as follows:

A class, function, variable, or member template specialization can be explicitly instantiated from its template. A member function, member class or static data member of a class template can be explicitly instantiated from the member definition associated with its class template. An explicit instantiation of a function template or, member function of a class template, or variable template shall not use the inline or constexpr specifiers.