template<class Base >

unsigned short CppAD::local::local_hash_code	(	OpCode	op,
		const addr_t *	arg,
		size_t	npar,
		const Base *	par
	)

Specialized hash code for a CppAD operator and its arguments.

Parameters

op	is the operator that we are computing a hash code for. If it is not one of the following operartors, the operator is not hash coded and zero is returned:

• unary operators: AbsOp, AcosOp, AcoshOp, AsinOp, AsinhOp, AtanOp, AtanhOp, CosOp, CoshOp ExpOp, Expm1Op, LogOp, Log1pOp, SinOp, SinhOp, SqrtOp, TanOp, TanhOp

• binary operators where first argument is a parameter: AddpvOp, DivpvOp, MulpvOp, PowpvOp, SubpvOp, ZmulpvOp

• binary operators where second argument is a parameter: DivvpOp, PowvpOp, SubvpOp, Zmulvp

• binary operators where first is an index and second is a variable: DisOp

• binary operators where both arguments are variables: AddvvOp, DivvvOp, MulvvOp, PowvvOp, SubvvOp, ZmulvvOp

Parameters

arg	is a vector of length NumArg(op) or 2 (which ever is smaller), containing the corresponding argument indices for this operator.
npar	is the number of parameters corresponding to this operation sequence.
par	is a vector of length npar containing the parameters for this operation sequence; i.e., given a parameter index of i, the corresponding parameter value is par[i].

Returns

is a hash code that is between zero and CPPAD_HASH_TABLE_SIZE - 1.

Checked Assertions

op must be one of the operators specified above. In addition,

• std::numeric_limits<unsigned short>::max() >= CPPAD_HASH_TABLE_SIZE
• sizeof(size_t) is even
• sizeof(Base) is even
• sizeof(unsigned short) == 2
• size_t(op) < size_t(NumberOp) <= CPPAD_HASH_TABLE_SIZE
• if the j-th argument for this operation is a parameter, arg[j] < npar.

Definition at line 122 of file local/hash_code.hpp.