\(\newcommand{\W}[1]{ \; #1 \; }\) \(\newcommand{\R}[1]{ {\rm #1} }\) \(\newcommand{\B}[1]{ {\bf #1} }\) \(\newcommand{\D}[2]{ \frac{\partial #1}{\partial #2} }\) \(\newcommand{\DD}[3]{ \frac{\partial^2 #1}{\partial #2 \partial #3} }\) \(\newcommand{\Dpow}[2]{ \frac{\partial^{#1}}{\partial {#2}^{#1}} }\) \(\newcommand{\dpow}[2]{ \frac{ {\rm d}^{#1}}{{\rm d}\, {#2}^{#1}} }\)

ad_ctor.cpp

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AD Constructors: Example and Test

# 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.;
   ok &= Constant(a);

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

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

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

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

   return ok;
}