# include <cppad/cppad.hpp>

bool ad_ctor(void)
{     bool ok = true;   // initialize test result flag
     using CppAD::AD;  // so can use AD in place of CppAD::AD

     // default constructor
     AD<double> a;
     a = 0.;
     ok &= a == 0.;

     // constructor from base type
     AD<double> b(1.);
     ok &= b == 1.;

     // constructor from another type that converts to the base type
     AD<double> c(2);
     ok &= c == 2.;

     // constructor from AD<Base>
     AD<double> d(c);
     ok &= d == 2.;

     // constructor from a VecAD<Base> element
     CppAD::VecAD<double> v(1);
     v[0] = 3.;
     AD<double> e( v[0] );
     ok &= e == 3.;

     return ok;
}