SundanceUnaryMinus.cpp

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//                             Sundance
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/* @HEADER@ */

#include "SundanceUnaryMinus.hpp"

using namespace Sundance;
using namespace Sundance;

using namespace Sundance;
using namespace Teuchos;

UnaryMinus::UnaryMinus(const RCP<ScalarExpr>& arg)
  : UnaryExpr(arg)
{}

Set<MultiSet<int> > UnaryMinus::internalFindQ_W(int order, const EvalContext& context) const
{
  int verb = context.setupVerbosity();
  Tabs tab(0);
  SUNDANCE_MSG2(verb, tab << "UnaryMinus::internalFindQ_W(" << order << ")");
  Set<MultiSet<int> > rtn;
  if (order > 1) return rtn;

  if (order==1)
  {
    /* first derivatives of the sum wrt the arguments are 
     * always nonzero */
    rtn.put(makeMultiSet<int>(0));
  }
  else 
  {
    /* zeroth derivatives are nonzero if terms are nonzero */
    const Set<MultipleDeriv>& w 
      = evaluatableArg()->findW(0, context);
    if (w.size() > 0)
    {
      rtn.put(makeMultiSet<int>(0));
    }
  }
  return rtn;
}

std::ostream& UnaryMinus::toText(std::ostream& os, bool paren) const 
{
  if (paren) os << "(";
  os << "-" << arg().toString();
  if (paren) os << ")";
  return os;
}

XMLObject UnaryMinus::toXML() const
{
  XMLObject rtn("UnaryMinus");
  rtn.addChild(arg().toXML());
  return rtn;
}