Re: [Boost-bugs] [Boost C++ Libraries] #13434: index_args_default_compare uses result_type

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #13434: index_args_default_compare uses result_type
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2018-02-03 09:42:41

#13434: index_args_default_compare uses result_type
-------------------------------+-----------------------------------
  Reporter:  gast128@…         |      Owner:  Joaquín M López Muñoz
      Type:  Bugs              |     Status:  closed
 Milestone:  To Be Determined  |  Component:  multi_index
   Version:  Boost 1.65.0      |   Severity:  Problem
Resolution:  invalid           |   Keywords:
-------------------------------+-----------------------------------

Comment (by Joaquín M López Muñoz):

 On the absence of `std::unary_function`, the simplest alternative is to
 write the nested `typedef` yourself as shown above.

 The rationale behind this removal is that C++11 and later allow for
 smarter ways of detecting the result type of `operator()` such as
 [http://en.cppreference.com/w/cpp/types/result_of
 std::result_of/std::invoke_result]: if Boost.!MultiIndex had been written
 10 years later, it'd have probably relied on one of these rather than
 requiring the user to provide `::result_type`.

-- 
Ticket URL: <https://svn.boost.org/trac10/ticket/13434#comment:6>
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