[libcxx-commits] [PATCH] D117974: [libc++] Make C++03 reference_wrapper more like C++11.

[Arthur O'Dwyer via Phabricator via libcxx-commits]

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Remove a bunch of `LIBCPP_CXX03_LANG`. This is the result of a rabbithole to re-eliminate the workaround I introduced into `std::cref` in parent revision D117953 <https://reviews.llvm.org/D117953>. It turns out that Clang's C++03 mode (the only compiler we care about C++03 for) now supports all the things we were originally eschewing via `LIBCPP_CXX03_LANG`; we can fully support these `reference_wrapper` features in C++03 mode, and un-XFAIL the relevant tests.

Drive-by constexprify a few more tests.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D117974

Files:
  libcxx/include/__functional/reference_wrapper.h
  libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor.pass.cpp
  libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_conv_ctor2.pass.cpp
  libcxx/test/std/utilities/function.objects/refwrap/refwrap.const/type_ctor.compile.fail.cpp
  libcxx/test/std/utilities/function.objects/refwrap/refwrap.helpers/ref_1.compile.fail.cpp

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