Stephan T. Lavavej 3ed719bb63 [libcxx] [test] Avoid unary_function.
Replace unary_function inheritance (which was never required,
even in C++98) with argument_type and result_type typedefs.
This increases portability, as unary_function was removed in C++17
and MSVC has implemented that removal.

Fixes D45596.

llvm-svn: 329974
2018-04-12 23:56:10 +00:00
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