[LLVMbugs] [Bug 19123] deprecated warning for implicit copy constructor doesn't notice the destructor is defaulted

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19123

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> ---
This deprecation is enshrined in the C++11 standard:

" If the class definition declares a move constructor or move assignment
operator, the implicitly declared copy
assignment operator is defined as deleted; otherwise, it is defined as defaulted
(8.4). The latter case is
deprecated if the class has a user-declared copy constructor or a user-declared
destructor."

So "= default" doesn't help here.

Note that this is even more problematic in the face of move operations -
defining an implicit move op as explicitly defaulted will disable (define as
deleted, as seen in the above wording) copy operations.

Providing implicit ops explicitly with = default isn't a noop and should be
avoided.

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