CppAD: A C++ Algorithmic Differentiation Package  20130918
add_eq.hpp
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00001 /* $Id$ */
00002 # ifndef CPPAD_ADD_EQ_INCLUDED
00003 # define CPPAD_ADD_EQ_INCLUDED
00004 
00005 /* --------------------------------------------------------------------------
00006 CppAD: C++ Algorithmic Differentiation: Copyright (C) 2003-12 Bradley M. Bell
00007 
00008 CppAD is distributed under multiple licenses. This distribution is under
00009 the terms of the 
00010                     Eclipse Public License Version 1.0.
00011 
00012 A copy of this license is included in the COPYING file of this distribution.
00013 Please visit http://www.coin-or.org/CppAD/ for information on other licenses.
00014 -------------------------------------------------------------------------- */
00015 
00016 //  BEGIN CppAD namespace
00017 namespace CppAD {
00018 
00019 template <class Base>
00020 AD<Base>& AD<Base>::operator += (const AD<Base> &right)
00021 {
00022      // compute the Base part 
00023      Base left;
00024      left    = value_;
00025      value_ += right.value_;
00026 
00027      // check if there is a recording in progress
00028      ADTape<Base>* tape = AD<Base>::tape_ptr();
00029      if( tape == CPPAD_NULL )
00030           return *this;
00031      tape_id_t tape_id = tape->id_;
00032 
00033      // tape_id cannot match the default value for tape_id_; i.e., 0
00034      CPPAD_ASSERT_UNKNOWN( tape_id > 0 );
00035      bool var_left  = tape_id_       == tape_id;
00036      bool var_right = right.tape_id_ == tape_id;
00037 
00038      if( var_left )
00039      {    if( var_right )
00040           {    // this = variable + variable
00041                CPPAD_ASSERT_UNKNOWN( NumRes(AddvvOp) == 1 );
00042                CPPAD_ASSERT_UNKNOWN( NumArg(AddvvOp) == 2 );
00043 
00044                // put operand addresses in tape
00045                tape->Rec_.PutArg(taddr_, right.taddr_);
00046                // put operator in the tape
00047                taddr_ = tape->Rec_.PutOp(AddvvOp);
00048                // make this a variable
00049                CPPAD_ASSERT_UNKNOWN( tape_id_ == tape_id );
00050           }
00051           else if( ! IdenticalZero( right.value_ ) )
00052           {    // this = variable  + parameter
00053                //      = parameter + variable
00054                CPPAD_ASSERT_UNKNOWN( NumRes(AddpvOp) == 1 );
00055                CPPAD_ASSERT_UNKNOWN( NumArg(AddpvOp) == 2 );
00056 
00057                // put operand addresses in tape
00058                addr_t p = tape->Rec_.PutPar(right.value_);
00059                tape->Rec_.PutArg(p, taddr_);
00060                // put operator in the tape
00061                taddr_ = tape->Rec_.PutOp(AddpvOp);
00062                // make this a variable
00063                CPPAD_ASSERT_UNKNOWN( tape_id_ == tape_id );
00064           }
00065      }
00066      else if( var_right  )
00067      {    if( IdenticalZero(left) )
00068           {    // this = 0 + right
00069                make_variable(right.tape_id_, right.taddr_);
00070           }
00071           else
00072           {    // this = parameter + variable
00073                CPPAD_ASSERT_UNKNOWN( NumRes(AddpvOp) == 1 );
00074                CPPAD_ASSERT_UNKNOWN( NumArg(AddpvOp) == 2 );
00075 
00076                // put operand addresses in tape
00077                addr_t p = tape->Rec_.PutPar(left);
00078                tape->Rec_.PutArg(p, right.taddr_);
00079                // put operator in the tape
00080                taddr_ = tape->Rec_.PutOp(AddpvOp);
00081                // make this a variable
00082                tape_id_ = tape_id;
00083           }
00084      }
00085      return *this;
00086 }
00087 
00088 CPPAD_FOLD_ASSIGNMENT_OPERATOR(+=)
00089 
00090 } // END CppAD namespace
00091 
00092 # endif 
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