Re: [boost] [Boost-bugs] [ boost-Bugs-1315712 ] Addingboost::is_complex to type_traits.hpp

From: Neal Becker (ndbecker2_at_[hidden])
Date: 2005-10-07 12:00:33

Oh, 1 more:

There are many cases you want to define a function F that applies both to
scalar, and when applied to complex the result F(x) = complex (F(real(x)),
F(imag(x))).

ComplexFunc is handy for this:

template<typename UnaryFunction, typename in_t>
inline std::complex<typename boost::result_of<UnaryFunction(typename
in_t::value_type)>::type> ComplexFunc (UnaryFunction f, in_t x) {
  typedef std::complex<typename boost::result_of<UnaryFunction(typename
in_t::value_type)>::type> ret_t;
  return ret_t (f (real (x)), f (imag (x)));
}