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# ifndef CPPAD_SUB_EQ_INCLUDED
# define CPPAD_SUB_EQ_INCLUDED

/* --------------------------------------------------------------------------
CppAD: C++ Algorithmic Differentiation: Copyright (C) 2003-07 Bradley M. Bell

CppAD is distributed under multiple licenses. This distribution is under
the terms of the 
                    Common Public License Version 1.0.

A copy of this license is included in the COPYING file of this distribution.
Please visit http://www.coin-or.org/CppAD/ for information on other licenses.
-------------------------------------------------------------------------- */

//  BEGIN CppAD namespace
namespace CppAD {

template <class Base>
AD<Base>& AD<Base>::operator -= (const AD<Base> &right)
{       Base left;

        left   = value_;
        value_ -= right.value_;

        if( Parameter(*this) )
        {       if( Variable(right) )
                {       right.tape_this()->RecordOp(SubpvOp, 
                                *this, left, right.taddr_
                        );
                }
        }
        else if( Parameter(right) )
        {       if( ! IdenticalZero(right) )
                {       tape_this()->RecordOp(SubvpOp, 
                                *this, taddr_, right.value_
                        );
                }
        }
        else
        {       CPPAD_ASSERT_KNOWN(
                        id_ == right.id_,
                        "Subtracting AD objects that are"
                        " variables on different tapes."
                );
                tape_this()->RecordOp(SubvvOp, 
                        *this, taddr_, right.taddr_
                );
        }
        return *this;
}

CPPAD_FOLD_ASSIGNMENT_OPERATOR(-=)

} // END CppAD namespace

# endif 

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