[LLVMbugs] [Bug 19085] Can't std::sort a collection of std::pair if one pair element is const

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19085

David Blaikie <dblaikie at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |dblaikie at gmail.com
         Resolution|---                         |INVALID

--- Comment #1 from David Blaikie <dblaikie at gmail.com> ---
25.4.1.1/2 (the requirements for std::sort) states:

RandomAccessIterator shall satisfy the requirements of ValueSwappable
(17.6.3.2). The type of *first shall satisfy the requirements of
MoveConstructible (Table 20) and of MoveAssignable (Table 22).

A pair with a const member does not meet that last requirement
(MoveAssignable).

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