[PATCH] [libcxx] Support UDTs convertible to arithmetic types in <cmath>

[Agustín Bergé]

Hi mclow.lists, EricWF,

This patch enables generic <cmath> overloads for types unambiguously convertible to any arithmetic type. Addresses PR18218.

Only `pow` is implemented completely, with proper `noexcept` specifications and the conversion dance, taken from Howard's original patch. If it looks good I'll extend the implementation and test cases to all the other generic <cmath> overloads.

http://reviews.llvm.org/D5942

Files:
  include/cmath
  include/type_traits
  test/numerics/c.math/cmath.pass.cpp
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