Re: [Boost-bugs] [Boost C++ Libraries] #11993: Add a default constructor to intrusive unordered_set and unordered_multiset

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #11993: Add a default constructor to intrusive unordered_set and unordered_multiset
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-03-01 21:18:12

#11993: Add a default constructor to intrusive unordered_set and unordered_multiset
-------------------------------+------------------------
  Reporter:  anonymous         |      Owner:  igaztanaga
      Type:  Feature Requests  |     Status:  closed
 Milestone:  To Be Determined  |  Component:  intrusive
   Version:  Boost 1.60.0      |   Severity:  Problem
Resolution:  wontfix           |   Keywords:
-------------------------------+------------------------
Changes (by igaztanaga):

 * status:  new => closed
 * resolution:   => wontfix

Comment:

 Allowing a intrusive container without buckets, apart from pessimizing
 functions that must check for this special condition, makes all other
 insertion functions invalid (the intrusive container can't allocate memory
 so all functions should have a precondition saying that a bucket must have
 been introduced). This precondition-free behaviour was a design decision.

 You can always use a single bucket for the "nearly default constructed"
 type, in case you want to minimize memory waste (a single bucket requires
 just the storage of a pointer).

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11993#comment:1>
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