ConstantRestraint.h

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/**
 *  \file IMP/core/ConstantRestraint.h    \brief Constant restraint.
 *
 *  Just return a constant.
 *
 *  Copyright 2007-2013 IMP Inventors. All rights reserved.
 *
 */

#ifndef IMPCORE_CONSTANT_RESTRAINT_H
#define IMPCORE_CONSTANT_RESTRAINT_H

#include <IMP/core/core_config.h>

#include <IMP/kernel/Restraint.h>
#include <IMP/PairScore.h>
#include <IMP/restraint_macros.h>

IMPCORE_BEGIN_NAMESPACE

//! Return a constant value.
/** This restraint is mostly for testing, but can also be used to make
    the total score look nicer.
 */
class IMPCOREEXPORT ConstantRestraint : public kernel::Restraint {
  Float v_;

 public:
  //! Add v to the total score.
  ConstantRestraint(Float v);

  virtual double unprotected_evaluate(
      IMP::kernel::DerivativeAccumulator *accum) const IMP_OVERRIDE;
  virtual IMP::kernel::ModelObjectsTemp do_get_inputs() const IMP_OVERRIDE;
  IMP_OBJECT_METHODS(ConstantRestraint);
};

IMPCORE_END_NAMESPACE

#endif /* IMPCORE_CONSTANT_RESTRAINT_H */