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

Alignment/Geners/interface/IOIsWritable.hh

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08 май 2019, 15:16

08 май 2019, 15:167614b05

#ifndef GENERS_IOISWRITABLE_HH_
#define GENERS_IOISWRITABLE_HH_

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

#include <ostream>

namespace gs {
  template <typename T>
  class IOIsWritableHelper {
  private:
    template <bool (T::*)(std::ostream &) const>
    struct tester;
    typedef char One;
    typedef struct {
      char a[2];
    } Two;
    template <typename C>
    static One test(tester<&C::write> *);
    template <typename C>
    static Two test(...);

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

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

  template <typename T>
  struct IOIsWritable<T, true> {
    enum { value = IOIsWritableHelper<T>::value };
  };
}  // namespace gs

#endif  // GENERS_IOISWRITABLE_HH_