EigenZeroDefs.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
 * Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration.
 */
#ifndef XAODMEASUREMENTBASE_EIGENZERODEFS_H
#define XAODMEASUREMENTBASE_EIGENZERODEFS_H
 
 
#include "EventPrimitives/EventPrimitives.h"
#include "AthContainers/tools/AuxDataTraits.h"
 
 
namespace SG {
 
 
// The default Matrix constructor does not initialize the matrix contents.
// Specialize this for Matrix, so that when we have Matrix auxiliary variables,
// they'll be fully initialized after a resize, etc.
template <typename SCALAR, int ROWS, int COLS, int OPTIONS, int MAXROWS, int MAXCOLS>
struct Zero<Eigen::Matrix<SCALAR, ROWS, COLS, OPTIONS, MAXROWS, MAXCOLS> >
{
  typedef Eigen::Matrix<SCALAR, ROWS, COLS, OPTIONS, MAXROWS, MAXCOLS> Matrix;
  static Matrix zero()
  {
    Matrix m;
    m.setZero();
    return m;
  }
};
 
 
} // namespace SG
 
 
#endif // not XAODMEASUREMENTBASE_EIGENZERODEFS_H