Re: [Boost-bugs] [Boost C++ Libraries] #12788: optional 1.63 no longer can be initialized from '<brace-enclosed initializer list>'

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #12788: optional 1.63 no longer can be initialized from '<brace-enclosed initializer list>'
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-02-27 11:43:03

#12788: optional 1.63 no longer can be initialized from '<brace-enclosed
initializer list>'
-------------------------------+----------------------
  Reporter:  piotrwn1@…        |      Owner:  akrzemi1
      Type:  Bugs              |     Status:  closed
 Milestone:  To Be Determined  |  Component:  optional
   Version:  Boost 1.63.0      |   Severity:  Problem
Resolution:  invalid           |   Keywords:
-------------------------------+----------------------

Comment (by piotrwn1@…):

 This is real problem, please do not close.

 See this code:


 {{{
 #include <boost/optional.hpp>
 #include <optional>
 #include <iostream>

 #define PRN(a) std::cout << #a "\n";
 #define DEF(a, r) a { PRN(a); r }

 struct Verbose {
     DEF(Verbose(int,double),)
     DEF(Verbose(),)
     DEF(~Verbose(),)
     DEF(Verbose(const Verbose&),)
     DEF(Verbose(Verbose&&),)
     DEF(Verbose& operator = (const Verbose&), return *this;)
     DEF(Verbose& operator = (Verbose&&), return *this;)
 };

 using vbo = boost::optional<Verbose>;
 using vso = std::optional<Verbose>;

 int main() {
     vbo bo;
     vso so;

     bo = {1,1.1}; // works for boost1.62, not for boost.1.63
     so = {1,1.1}; // works for std::optional
 }
 }}}

 Link do demo: http://melpon.org/wandbox/permlink/wDvuR7T9b7bI5fHq

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12788#comment:7>
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