[LLVMbugs] [Bug 18721] std::bind() seems to not pass placeholder arguments correctly when they are repeated

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18721

jonathan.sauer at gmx.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from jonathan.sauer at gmx.de ---
It seems that this isn't a bug, but intended behavior:

<http://stackoverflow.com/a/9945229>
<http://stackoverflow.com/a/10009750>

C.f. C++11 §20.8.9.1.2p10:

| if the value j of is_placeholder<TiD>::value is not zero, the argument is
| std::forward<Uj>(uj) and its type Vi is Uj&&;

By changing TestFunc's signature to

  static void TestFunc(const shared_ptr<int>& xx, const shared_ptr<int>& yy) {

the original code works as expected.

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