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src
ConstOverFunction.cc
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// -*- C++ -*-
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// $Id: ConstOverFunction.cc,v 1.3 2003/09/06 14:04:14 boudreau Exp $
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#include "
CLHEP/GenericFunctions/ConstOverFunction.hh
"
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namespace
Genfun {
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FUNCTION_OBJECT_IMP
(ConstOverFunction)
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ConstOverFunction
::
ConstOverFunction
(
double
constant, const
AbsFunction
*arg):
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_constant(constant),
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_arg(arg->clone())
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{
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}
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ConstOverFunction::ConstOverFunction
(
const
ConstOverFunction
& right) :
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_constant(right._constant),
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_arg(right._arg->clone())
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{}
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unsigned
int
ConstOverFunction::dimensionality
()
const
{
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return
_arg->
dimensionality
();
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}
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ConstOverFunction::~ConstOverFunction
()
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{
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delete
_arg;
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}
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double
ConstOverFunction::operator ()
(
double
x)
const
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{
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return
_constant / (*_arg)(x);
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}
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double
ConstOverFunction::operator ()
(
const
Argument
& x)
const
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{
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return
_constant / (*_arg)(x);
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}
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Derivative
ConstOverFunction::partial
(
unsigned
int
index)
const
{
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// d/dx (k/f) = -(k/f^2)(df/dx)
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const
AbsFunction
& fPrime = -_constant/(*_arg)/(*_arg)*(_arg->
partial
(index));
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return
Derivative
(& fPrime);
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}
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}
// namespace Genfun
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