itkNumericTraitsStdVector.h

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#ifndef __itkNumericTraitsStdVector_h
#define __itkNumericTraitsStdVector_h

#include "itkNumericTraits.h"
#include <vector>

// This work is part of the National Alliance for Medical Image Computing
// (NAMIC), funded by the National Institutes of Health through the NIH Roadmap
// for Medical Research, Grant U54 EB005149.

namespace itk
{
template< typename T >
class NumericTraits< std::vector< T > >
{
public:

  typedef typename NumericTraits< T >::AbsType        ElementAbsType;
  typedef typename NumericTraits< T >::AccumulateType ElementAccumulateType;
  typedef typename NumericTraits< T >::FloatType      ElementFloatType;
  typedef typename NumericTraits< T >::PrintType      ElementPrintType;
  typedef typename NumericTraits< T >::RealType       ElementRealType;

  typedef T ValueType;

  typedef std::vector< T > Self;

  typedef std::vector< ElementAbsType > AbsType;

  typedef std::vector< ElementAccumulateType > AccumulateType;

  typedef std::vector< ElementFloatType > FloatType;

  // TODO: this won't really print well, at least not without defining an operator
  // to push to a stream.
  typedef std::vector< ElementPrintType > PrintType;

  typedef std::vector< ElementRealType > RealType;

  typedef ElementRealType ScalarRealType;

  typedef Self MeasurementVectorType;

  static const Self max(const Self & a)
  {
    Self b( a.Size(), NumericTraits< T >::max() );
    return b;
  }

  static const Self min(const Self & a)
  {
    Self b( a.Size(), NumericTraits< T >::min() );
    return b;
  }

  static const Self ZeroValue(const Self  & a)
  {
    Self b( a.Size(), NumericTraits< T >::Zero );
    return b;
  }

  static const Self OneValue(const Self & a)
  {
    Self b( a.Size(), NumericTraits< T >::One );
    return b;
  }

  static const Self NonpositiveMin(const Self & a)
  {
    Self b( a.Size(), NumericTraits< T >::NonpositiveMin() );
    return b;
  }

  static void SetLength(std::vector< T > & m, const unsigned int s)
  {
    // since std::vector often holds types that have no NumericTraits::Zero,
    // allow resize() to call the type's default constructor
    m.clear();
    m.resize(s);
  }

  static unsigned int GetLength(const std::vector< T > & m)
  {
    return m.size();
  }

  static void AssignToArray( const Self & v, MeasurementVectorType & mv )
  {
    mv = v;
  }

  template<typename TArray>
  static void AssignToArray( const Self & v, TArray & mv )
  {
    for( unsigned int i=0; i<GetLength(v); i++ )
      {
      mv[i] = v[i];
      }
  }

};
} // end namespace itk

#endif // __itkNumericTraitsStdVector_h