This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-08-11
2032. Default template-arguments of variable templatesSection: 13.2 [temp.param] Status: CD4 Submitter: CWG Date: 2014-11-03[Adopted at the February, 2016 meeting.]
According to 13.2 [temp.param] paragraph11,
If a template-parameter of a class template or alias template has a default template-argument, each subsequent template-parameter shall either have a default template-argument supplied or be a template parameter pack. If a template-parameter of a primary class template or alias template is a template parameter pack, it shall be the last template-parameter.
These requirements should apply to variable templates as well.
Proposed resolution (September, 2015):
Change 13.2 [temp.param] paragraph 11 as follows:
If a template-parameter of a class template , variable template, or alias template has a default template-argument, each subsequent template-parameter shall either have a default template-argument supplied or be a template parameter pack. If a template-parameter of a primary class template , primary variable template, or alias template is a template parameter pack, it shall be the last template-parameter. A template parameter pack...
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