TemplateTools.h

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// -*- C++ -*-
//
// TemplateTools.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 2006-2019 David Grellscheid, Leif Lonnblad
//
// ThePEG is licenced under version 3 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef Template_Tools_H
#define Template_Tools_H
 
#include <type_traits>
 
namespace ThePEG {
 
template <int v>
struct Int2Type
{
  enum { value = v };
};
 
struct DummyType {};
 
enum ImplSelector { Dimensioned, Standard, Enumerated };
 
typedef Int2Type<Dimensioned> DimensionT;
 
typedef Int2Type<Standard> StandardT;
 
typedef Int2Type<Enumerated> EnumT;
 
 
template <typename T>
struct TypeTraits
{
  enum { hasDimension = false };
  typedef StandardT DimType;
  // construction with extra U type is necessary to make
  // enable_if work before concepts are supported properly
  template <typename U = T>
  static constexpr typename
  std::enable_if< (std::is_arithmetic<U>::value && 
                   std::is_same<U, T>::value), U>::type 
  baseunit() 
  { return static_cast<U>(1); }
};
 
}
 
#endif