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@(@\newcommand{\B}[1]{ {\bf #1} } \newcommand{\R}[1]{ {\rm #1} }@)@
C++: a_double Assignment Operators: Example and Test
# include <cstdio>
# include <cppad/py/cppad_py.hpp>

bool a_double_assign_xam(void) {
     using cppad_py::a_double;
     //
     // initialize return variable
     bool ok = true;
     //------------------------------------------------------------------------
     a_double ax(2.0);
     //
     ax = 3.0;
     ok = ok && ax == 3.0;
     //
     ax += a_double(2.0);
     ok = ok && ax == 5.0;
     //
     ax -= 1.0;
     ok = ok && ax == 4.0;
     //
     ax *= a_double(3.0);
     ok = ok && ax == 12.0;
     //
     ax /= 4.0;
     ok = ok && ax == a_double(3.0);
     //
     return( ok );
}

Input File: lib/example/cplusplus/a_double_assign_xam.cpp