220 5803 <eff79c53-acf6-4378-95cc-71ffe557d5ff@isocpp.org> article
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From: David Krauss <potswa@gmail.com>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: Making std::vector<std::unique_ptr<void>> not be
 copy constructible, among other things
Date: Sun, 25 Aug 2013 11:10:00 -0700 (PDT)
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On Monday, August 26, 2013 1:54:17 AM UTC+8, David Krauss wrote:
> Implementing SFINAE on a copy constructor is unfortunately harder than it should be, and I'm not aware of any fix in the pipeline. 

Referring from Nicol's answer to N3701, Concepts Lite does address the issue by extending SFINAE-style conditional declaration to non-template members.

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