Re: [Boost-bugs] [Boost C++ Libraries] #9953: lazy_enable_if is not sfinae friendly

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9953: lazy_enable_if is not sfinae friendly
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-07-08 20:37:35

#9953: lazy_enable_if is not sfinae friendly
-------------------------------+-------------------------
  Reporter:  hui.li@…          |      Owner:  Peter Dimov
      Type:  Feature Requests  |     Status:  new
 Milestone:  To Be Determined  |  Component:  core
   Version:  Boost 1.55.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+-------------------------
Changes (by Andrey Semashev):

 * owner:  No-Maintainer => Peter Dimov
 * component:  utility => core

Comment:

 This might be useful. Deriving from `T` won't work if it is `final`, but
 in C++11 we could reformulate `lazy_enable_if_c` like this:

 {{{
 template< bool Cond, typename T >
 using lazy_enable_if_c = typename enable_if_c< Cond, T >::type::type;
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac10/boost/ticket/9953#comment:2>
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