CppAD: A C++ Algorithmic Differentiation Package 20110419
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00001 /* $Id$ */ 00002 # ifndef CPPAD_ADD_INCLUDED 00003 # define CPPAD_ADD_INCLUDED 00004 00005 /* -------------------------------------------------------------------------- 00006 CppAD: C++ Algorithmic Differentiation: Copyright (C) 2003-11 Bradley M. Bell 00007 00008 CppAD is distributed under multiple licenses. This distribution is under 00009 the terms of the 00010 Common 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> operator + (const AD<Base> &left , const AD<Base> &right) 00021 { ADTape<Base> *tape = AD<Base>::tape_ptr(); 00022 size_t tape_id = 0; 00023 if( tape != CPPAD_NULL ) 00024 tape_id = tape->id_; 00025 00026 // id_ setting for parameters cannot match 0 00027 bool var_left = left.id_ == tape_id; 00028 bool var_right = right.id_ == tape_id; 00029 CPPAD_ASSERT_KNOWN( 00030 Parameter(left) || var_left , 00031 "+: left operand is a variable for a different thread" 00032 ); 00033 CPPAD_ASSERT_KNOWN( 00034 Parameter(right) || var_right , 00035 "+: right operand is a variable for a different thread" 00036 ); 00037 00038 AD<Base> result; 00039 result.value_ = left.value_ + right.value_; 00040 CPPAD_ASSERT_UNKNOWN( Parameter(result) ); 00041 00042 if( var_left ) 00043 { if( var_right ) 00044 { // result = variable + variable 00045 CPPAD_ASSERT_UNKNOWN( NumRes(AddvvOp) == 1 ); 00046 CPPAD_ASSERT_UNKNOWN( NumArg(AddvvOp) == 2 ); 00047 00048 // put operand addresses in tape 00049 tape->Rec_.PutArg(left.taddr_, right.taddr_); 00050 // put operator in the tape 00051 result.taddr_ = tape->Rec_.PutOp(AddvvOp); 00052 // make result a variable 00053 result.id_ = tape_id; 00054 } 00055 else if( IdenticalZero(right.value_) ) 00056 { // result = variable + 0 00057 result.make_variable(left.id_, left.taddr_); 00058 } 00059 else 00060 { // result = variable + parameter 00061 // = parameter + variable 00062 CPPAD_ASSERT_UNKNOWN( NumRes(AddpvOp) == 1 ); 00063 CPPAD_ASSERT_UNKNOWN( NumArg(AddpvOp) == 2 ); 00064 00065 // put operand addresses in tape 00066 size_t p = tape->Rec_.PutPar(right.value_); 00067 tape->Rec_.PutArg(p, left.taddr_); 00068 // put operator in the tape 00069 result.taddr_ = tape->Rec_.PutOp(AddpvOp); 00070 // make result a variable 00071 result.id_ = tape_id; 00072 } 00073 } 00074 else if( var_right ) 00075 { if( IdenticalZero(left.value_) ) 00076 { // result = 0 + variable 00077 result.make_variable(right.id_, right.taddr_); 00078 } 00079 else 00080 { // result = parameter + variable 00081 CPPAD_ASSERT_UNKNOWN( NumRes(AddpvOp) == 1 ); 00082 CPPAD_ASSERT_UNKNOWN( NumArg(AddpvOp) == 2 ); 00083 00084 // put operand addresses in tape 00085 size_t p = tape->Rec_.PutPar(left.value_); 00086 tape->Rec_.PutArg(p, right.taddr_); 00087 // put operator in the tape 00088 result.taddr_ = tape->Rec_.PutOp(AddpvOp); 00089 // make result a variable 00090 result.id_ = tape_id; 00091 } 00092 } 00093 return result; 00094 } 00095 00096 // convert other cases into the case above 00097 CPPAD_FOLD_AD_VALUED_BINARY_OPERATOR(+) 00098 00099 } // END CppAD namespace 00100 00101 # endif