TypeTraits.h

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//============================================================================
//  The contents of this file are covered by the Viskores license. See
//  LICENSE.txt for details.
//
//  By contributing to this file, all contributors agree to the Developer
//  Certificate of Origin Version 1.1 (DCO 1.1) as stated in DCO.txt.
//============================================================================
 
//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//============================================================================
#ifndef viskores_TypeTraits_h
#define viskores_TypeTraits_h
 
#include <viskores/Types.h>
 
namespace viskores
{
 
struct TypeTraitsUnknownTag
{
};
 
struct TypeTraitsRealTag
{
};
 
struct TypeTraitsIntegerTag
{
};
 
struct TypeTraitsScalarTag
{
};
 
struct TypeTraitsVectorTag
{
};
 
template <typename T>
class TypeTraits
{
public:
  using NumericTag = viskores::TypeTraitsUnknownTag;
 
  using DimensionalityTag = viskores::TypeTraitsUnknownTag;
 
  VISKORES_EXEC_CONT static T ZeroInitialization() { return T(); }
};
 
// Const types should have the same traits as their non-const counterparts.
//
template <typename T>
struct TypeTraits<const T> : TypeTraits<T>
{
};
 
#define VISKORES_BASIC_REAL_TYPE(T)                  \
  template <>                                        \
  struct TypeTraits<T>                               \
  {                                                  \
    using NumericTag = TypeTraitsRealTag;            \
    using DimensionalityTag = TypeTraitsScalarTag;   \
    VISKORES_EXEC_CONT static T ZeroInitialization() \
    {                                                \
      return T();                                    \
    }                                                \
  };
 
#define VISKORES_BASIC_INTEGER_TYPE(T)               \
  template <>                                        \
  struct TypeTraits<T>                               \
  {                                                  \
    using NumericTag = TypeTraitsIntegerTag;         \
    using DimensionalityTag = TypeTraitsScalarTag;   \
    VISKORES_EXEC_CONT static T ZeroInitialization() \
    {                                                \
      using ReturnType = T;                          \
      return ReturnType();                           \
    }                                                \
  };
 
 
VISKORES_BASIC_REAL_TYPE(float)
VISKORES_BASIC_REAL_TYPE(double)
 
VISKORES_BASIC_INTEGER_TYPE(bool)
VISKORES_BASIC_INTEGER_TYPE(char)
VISKORES_BASIC_INTEGER_TYPE(signed char)
VISKORES_BASIC_INTEGER_TYPE(unsigned char)
VISKORES_BASIC_INTEGER_TYPE(short)
VISKORES_BASIC_INTEGER_TYPE(unsigned short)
VISKORES_BASIC_INTEGER_TYPE(int)
VISKORES_BASIC_INTEGER_TYPE(unsigned int)
VISKORES_BASIC_INTEGER_TYPE(long)
VISKORES_BASIC_INTEGER_TYPE(unsigned long)
VISKORES_BASIC_INTEGER_TYPE(long long)
VISKORES_BASIC_INTEGER_TYPE(unsigned long long)
 
#undef VISKORES_BASIC_REAL_TYPE
#undef VISKORES_BASIC_INTEGER_TYPE
 
template <typename T, viskores::IdComponent Size>
struct TypeTraits<viskores::Vec<T, Size>>
{
  using NumericTag = typename viskores::TypeTraits<T>::NumericTag;
  using DimensionalityTag = viskores::TypeTraitsVectorTag;
 
  VISKORES_EXEC_CONT
  static viskores::Vec<T, Size> ZeroInitialization()
  {
    return viskores::Vec<T, Size>(viskores::TypeTraits<T>::ZeroInitialization());
  }
};
 
template <typename T>
struct TypeTraits<viskores::VecCConst<T>>
{
  using NumericTag = typename viskores::TypeTraits<T>::NumericTag;
  using DimensionalityTag = TypeTraitsVectorTag;
 
  VISKORES_EXEC_CONT
  static viskores::VecCConst<T> ZeroInitialization() { return viskores::VecCConst<T>(); }
};
 
template <typename T>
struct TypeTraits<viskores::VecC<T>>
{
  using NumericTag = typename viskores::TypeTraits<T>::NumericTag;
  using DimensionalityTag = TypeTraitsVectorTag;
 
  VISKORES_EXEC_CONT
  static viskores::VecC<T> ZeroInitialization() { return viskores::VecC<T>(); }
};
 
template <typename T, typename U>
struct TypeTraits<viskores::Pair<T, U>>
{
  using NumericTag = viskores::TypeTraitsUnknownTag;
  using DimensionalityTag = viskores::TypeTraitsScalarTag;
 
  VISKORES_EXEC_CONT
  static viskores::Pair<T, U> ZeroInitialization()
  {
    return viskores::Pair<T, U>(TypeTraits<T>::ZeroInitialization(),
                                TypeTraits<U>::ZeroInitialization());
  }
};
 
} // namespace viskores
 
#endif //viskores_TypeTraits_h