[Boost-bugs] [Boost C++ Libraries] #10678: search by a compatible key and default predicates

Subject: [Boost-bugs] [Boost C++ Libraries] #10678: search by a compatible key and default predicates
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-10-19 19:47:07

#10678: search by a compatible key and default predicates
---------------------------------+-------------------------
 Reporter:  maxim.yegorushkin@…  |      Owner:  joaquin
     Type:  Bugs                 |     Status:  new
Milestone:  To Be Determined     |  Component:  multi_index
  Version:  Boost 1.56.0         |   Severity:  Problem
 Keywords:                       |
---------------------------------+-------------------------
 Ordered and hashed indexes require predicates for comparing elements,
 which default to std::equal_to<Key> and std::less<Key> respectively.

 At the same time find functions take a compatible key, that does not need
 to be convertible to Key.

 Using std::equal_to<Key> and std::less<Key> breaks find when the
 compatible key is not convertible to Key because these predicates require
 both arguments to be of type Key.

 Something like C++14 std::equal_to<void> and std::less<void> should be
 used as the default predicates.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/10678>
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