CppAD: A C++ Algorithmic Differentiation Package 20110419
|
00001 /* $Id$ */ 00002 # ifndef CPPAD_MUL_INCLUDED 00003 # define CPPAD_MUL_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(MulvvOp) == 1 ); 00046 CPPAD_ASSERT_UNKNOWN( NumArg(MulvvOp) == 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(MulvvOp); 00052 // make result a variable 00053 result.id_ = tape_id; 00054 } 00055 else if( IdenticalZero(right.value_) ) 00056 { // result = variable * 0 00057 } 00058 else if( IdenticalOne(right.value_) ) 00059 { // result = variable * 1 00060 result.make_variable(left.id_, left.taddr_); 00061 } 00062 else 00063 { // result = variable * parameter 00064 CPPAD_ASSERT_UNKNOWN( NumRes(MulpvOp) == 1 ); 00065 CPPAD_ASSERT_UNKNOWN( NumArg(MulpvOp) == 2 ); 00066 00067 // put operand addresses in tape 00068 size_t p = tape->Rec_.PutPar(right.value_); 00069 tape->Rec_.PutArg(p, left.taddr_); 00070 // put operator in the tape 00071 result.taddr_ = tape->Rec_.PutOp(MulpvOp); 00072 // make result a variable 00073 result.id_ = tape_id; 00074 } 00075 } 00076 else if( var_right ) 00077 { if( IdenticalZero(left.value_) ) 00078 { // result = 0 * variable 00079 } 00080 else if( IdenticalOne(left.value_) ) 00081 { // result = 1 * variable 00082 result.make_variable(right.id_, right.taddr_); 00083 } 00084 else 00085 { // result = parameter * variable 00086 CPPAD_ASSERT_UNKNOWN( NumRes(MulpvOp) == 1 ); 00087 CPPAD_ASSERT_UNKNOWN( NumArg(MulpvOp) == 2 ); 00088 00089 // put operand addresses in tape 00090 size_t p = tape->Rec_.PutPar(left.value_); 00091 tape->Rec_.PutArg(p, right.taddr_); 00092 // put operator in the tape 00093 result.taddr_ = tape->Rec_.PutOp(MulpvOp); 00094 // make result a variable 00095 result.id_ = tape_id; 00096 } 00097 } 00098 return result; 00099 } 00100 00101 // convert other cases into the case above 00102 CPPAD_FOLD_AD_VALUED_BINARY_OPERATOR(*) 00103 00104 } // END CppAD namespace 00105 00106 # endif