[llvm-bugs] [Bug 27221] member function of template instantiated even though only declaration is needed

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Apr 5 11:10:11 PDT 2016


Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
                 CC|                            |richard-llvm at metafoo.co.uk
         Resolution|---                         |INVALID

--- Comment #1 from Richard Smith <richard-llvm at metafoo.co.uk> ---
You've misunderstood how copy elision works. The program is analysed according
to the normal language rules (including template instantiation etc), except
that the implementation is permitted to choose to not perform a copy *if it
feels like it*. The definition is still required, because the implementation
could choose to invoke it. (And note that an implementation is not even
required to make the same choice each time it takes the same path through the
same code.)

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