[Boost-bugs] [Boost C++ Libraries] #4624: at() member function to ordered_index/hashed_index

Subject: [Boost-bugs] [Boost C++ Libraries] #4624: at() member function to ordered_index/hashed_index
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-09-03 03:48:05

#4624: at() member function to ordered_index/hashed_index
 Reporter: Akira Takahashi <faithandbrave@…> | Owner: joaquin
     Type: Patches | Status: new
Milestone: To Be Determined | Component: multi_index
  Version: Boost 1.44.0 | Severity: Problem
 Keywords: |
 ordered_index/hashed_index don't have operator[]() and at() member
 functions, those are inconsistent with std::map/boost::unordered_map. For
 this reason find() member function need to be used to access an element in
 ordered_index/hashed_index. It's annoying.

 To solve this issue, I propose to implement at() member function to
 ordered_index/hashed_index. operator[]() should not be added because it
 will conflict with random_access. (patches to implement my proposal are
 attached below)

 According to the design of MultiIndex library, I've only implemented const
 version of at() member function and left non-const version of at(), which
 allows destructive change, unimplemented.

 Although I think optional_at() member function which will report an error
 by boost::optional looks useful, I haven't included it in this proposal
 since error handling policy of MultiIndex library with using
 boost::optional is undefined.

Ticket URL: <https://svn.boost.org/trac/boost/ticket/4624>
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