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AD Boolean Functions: Example and Test
`

    # include <cppad/cppad.hpp>
    # include <complex>

    // define abbreviation for double precision complex
    typedef std::complex<double> Complex;

    namespace {
         // a unary bool function with Complex argument
         static bool IsReal(const Complex &x)
         {     return x.imag() == 0.; }

         // a binary bool function with Complex arguments
         static bool AbsGeq(const Complex &x, const Complex &y)
         {     double axsq = x.real() * x.real() + x.imag() * x.imag();
              double aysq = y.real() * y.real() + y.imag() * y.imag();

              return axsq >= aysq;
         }

         // Create version of IsReal with AD<Complex> argument
         // inside of namespace and outside of any other function.
         CPPAD_BOOL_UNARY(Complex, IsReal)

         // Create version of AbsGeq with AD<Complex> arguments
         // inside of namespace and outside of any other function.
         CPPAD_BOOL_BINARY(Complex, AbsGeq)

    }
    bool BoolFun(void)
    {     bool ok = true;

         CppAD::AD<Complex> x = Complex(1.,  0.);
         CppAD::AD<Complex> y = Complex(1.,  1.);

         ok &= IsReal(x);
         ok &= ! AbsGeq(x, y);

         return ok;
    }

`

Input File: example/general/bool_fun.cpp