$\newcommand{\W}[1]{ \; #1 \; } \newcommand{\R}[1]{ {\rm #1} } \newcommand{\B}[1]{ {\bf #1} } \newcommand{\D}[2]{ \frac{\partial #1}{\partial #2} } \newcommand{\DD}[3]{ \frac{\partial^2 #1}{\partial #2 \partial #3} } \newcommand{\Dpow}[2]{ \frac{\partial^{#1}}{\partial {#2}^{#1}} } \newcommand{\dpow}[2]{ \frac{ {\rm d}^{#1}}{{\rm d}\, {#2}^{#1}} }$
 # include <cppad/cppad.hpp> # include <limits> bool abort_recording(void) { bool ok = true; double eps = 10. * CppAD::numeric_limits<double>::epsilon(); using CppAD::AD; try { // domain space vector size_t n = 1; CPPAD_TESTVECTOR(AD<double>) x(n); x[0] = 0.; // declare independent variables and start tape recording CppAD::Independent(x); // simulate an error during calculation of y and the execution // stream was aborted throw 1; } catch (int e) { ok &= (e == 1); // do this incase throw occured after the call to Independent // (for case above this is known, but in general it is unknown) AD<double>::abort_recording(); } /* Now make sure that we can start another recording */ // declare independent variables and start tape recording size_t n = 1; double x0 = 0.5; CPPAD_TESTVECTOR(AD<double>) x(n); x[0] = x0; CppAD::Independent(x); // range space vector size_t m = 1; CPPAD_TESTVECTOR(AD<double>) y(m); y[0] = 2 * x[0]; // create f: x -> y and stop tape recording CppAD::ADFun<double> f(x, y); // forward computation of partials w.r.t. x[0] CPPAD_TESTVECTOR(double) dx(n); CPPAD_TESTVECTOR(double) dy(m); dx[0] = 1.; dy = f.Forward(1, dx); ok &= CppAD::NearEqual(dy[0], 2., eps, eps); return ok; }