Alignment/Geners/interface/IOIsReadable.hh - master - githubmirror/cmssw

Alignment/Geners/interface/IOIsReadable.hh

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08 май 2019, 15:16

08 май 2019, 15:167614b05

#ifndef GENERS_IOISREADABLE_HH_
#define GENERS_IOISREADABLE_HH_

#include "Alignment/Geners/interface/ClassId.hh"
#include "Alignment/Geners/interface/IOIsClassType.hh"
#include "Alignment/Geners/interface/StrippedType.hh"

namespace gs {
  template <typename T>
  class IOIsHeapReadableHelper {
  private:
    template <T *(*)(const ClassId &, std::istream &)>
    struct tester;
    typedef char One;
    typedef struct {
      char a[2];
    } Two;
    template <typename C>
    static One test(tester<&C::read> *);
    template <typename C>
    static Two test(...);

  public:
    enum { value = sizeof(IOIsHeapReadableHelper<T>::template test<T>(nullptr)) == 1 };
  };

  template <typename T, bool is_class_type = IOIsClassType<T>::value>
  struct IOIsHeapReadable {
    enum { value = 0 };
  };

  template <typename T>
  struct IOIsHeapReadable<T, true> {
    enum { value = IOIsHeapReadableHelper<typename StrippedType<T>::type>::value };
  };

  template <typename T>
  class IOIsPlaceReadableHelper {
  private:
    template <void (*)(const ClassId &, std::istream &, T *)>
    struct tester;
    typedef char One;
    typedef struct {
      char a[2];
    } Two;
    template <typename C>
    static One test(tester<&C::restore> *);
    template <typename C>
    static Two test(...);

  public:
    enum { value = sizeof(IOIsPlaceReadableHelper<T>::template test<T>(0)) == 1 };
  };

  template <typename T, bool is_class_type = IOIsClassType<T>::value>
  struct IOIsPlaceReadable {
    enum { value = 0 };
  };

  template <typename T>
  struct IOIsPlaceReadable<T, true> {
    enum { value = IOIsPlaceReadableHelper<typename StrippedType<T>::type>::value };
  };
}  // namespace gs

#endif  // GENERS_IOISREADABLE_HH_