[PATCH] D24372: [libcxx] Sprinkle constexpr over compressed_pair

[Keno Fischer via cfe-commits]

loladiro created this revision.
loladiro added reviewers: EricWF, mclow.lists.
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Without this, unique_ptr is not constant initialized. I've added a test to that extent.
Unfortunately, I believe there's additional work required for C++11, since unique_ptr
uses std::forward internally which is not constexpr until C++14. Doing something about
that is not part of this patch. unique_ptr not being constant initialized is particularly problematic
because it is in libstdc++, so there's applications that rely on this behavior.

Repository:
  rL LLVM

https://reviews.llvm.org/D24372

Files:
  include/memory
  test/std/utilities/memory/unique.ptr/unique.ptr.runtime/unique.ptr.runtime.ctor/constinit.pass.cpp

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