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 //=========================================================================
 // ClassId.hh
 //
 // Class identifier for I/O operations. Contains class name and version
 // number. For templates, it should also contain version numbers of all
 // template parameter classes.
 //
 // I. Volobouev
 // September 2010
 //=========================================================================
 
 #ifndef GENERS_CLASSID_HH_
 #define GENERS_CLASSID_HH_
 
 #include <iostream>
 #include <string>
 #include <vector>
 
 namespace gs {
   class ClassId {
   public:
     // Generic constructor using a prefix (which is usually
     // a class name) and a version number
     inline ClassId(const char *prefix, const unsigned version, const bool isPtr = false) {
       initialize(prefix, version, isPtr);
     }
 
     // Generic constructor using a prefix (which is usually
     // a class name) and a version number
     inline ClassId(const std::string &prefix, const unsigned version, const bool isPtr = false) {
       initialize(prefix.c_str(), version, isPtr);
     }
 
     // Use the following constructor in the "classId()" methods
     // of user-developed classes.
     //
     // Implementation note: it is possible to "specialize"
     // this constructor by delegating the actual job to the
     // "ClassIdSpecialization". Then we would be able to create
     // class ids for built-in and user types in a unified
     // way. This, however, would incur a performance hit
     // due to the necessity of making another ClassId and
     // copying the result into the internals of the new object.
     // This performance hit was deemed significant. If you
     // need a universal way to create class ids at some
     // point in your code, use the "itemId" method instead
     // (this may or may not incur a performance hit, depending
     // on what exactly the compiler does).
     template <class T>
     inline ClassId(const T &) {
       initialize(T::classname(), T::version(), false);
     }
 
     // Constructor from the class id represented by a string
     explicit ClassId(const std::string &id);
 
     // Use the following constructor in "read" functions.
     // Dummy argument "reading" is needed in order to generate
     // a distinct function signature (otherwise the templated
     // constructor can win).
     ClassId(std::istream &in, int reading);
 
     // Use the following pseudo-constructor in static "read"
     // methods in case a type check is desired. It has to be
     // made static because constructor without any arguments
     // can not be a template. Also, this is the way to construct
     // class ids for built-in types (there is no way to specialize
     // member methods).
     template <class T>
     static ClassId makeId();
 
     // "Universal" item id which also works for built-in types
     template <class T>
     static ClassId itemId(const T &);
 
     // Inspectors for the class name and version number
     inline const std::string &name() const { return name_; }
     inline unsigned version() const { return version_; }
 
     // Is this class a pointer for I/O purposes?
     inline bool isPointer() const { return isPtr_; }
 
     // The following function should return a unique class id string
     // which takes version number into account
     inline const std::string &id() const { return id_; }
 
     // The following checks if the class name corresponds to
     // a template (using the standard manner of class name forming)
     bool isTemplate() const;
 
     // The following function fills the vector with class template
     // parameters (if the class is not a template, the vector is
     // cleared). Due to the manner in which things are used in this
     // package, the result is actually a vector of (vectors of size 1).
     void templateParameters(std::vector<std::vector<ClassId>> *p) const;
 
     // Function to write this object out. Returns "true" on success.
     bool write(std::ostream &of) const;
 
     // Comparison operators
     inline bool operator==(const ClassId &r) const { return id_ == r.id_; }
     inline bool operator!=(const ClassId &r) const { return !(*this == r); }
     inline bool operator<(const ClassId &r) const { return id_ < r.id_; }
     inline bool operator>(const ClassId &r) const { return id_ > r.id_; }
 
     // Modify the version number
     void setVersion(unsigned newVersion);
 
     // The following methods verify that the id/classname/version
     // of this object are equal to those of the argument and throw
     // "gs::IOInvalidArgument" exception if this is not so
     void ensureSameId(const ClassId &id) const;
     void ensureSameName(const ClassId &id) const;
     void ensureSameVersion(const ClassId &id) const;
 
     // The following method ensures that the version number of this
     // class id is within certain range [min, max], with both limits
     // allowed. "gs::IOInvalidArgument" exception is thrown if this
     // is not so.
     void ensureVersionInRange(unsigned min, unsigned max) const;
 
     // Sometimes one really needs to make a placeholder class id...
     // This is a dangerous function: the code using ClassId class
     // will normally assume that a ClassId object is always in a valid
     // state. Invalid class ids can be distinguished by their empty
     // class names (i.e., name().empty() returns "true").
     static ClassId invalidId();
 
   private:
     ClassId();
 
     void initialize(const char *prefix, unsigned version, bool isPtr);
     bool makeName();
     bool makeVersion();
 
     std::string name_;
     std::string id_;
     unsigned version_;
     bool isPtr_;
 
     // Return "true" if the prefix is valid
     static bool validatePrefix(const char *prefix);
   };
 
   // Simple class id compatibility checkers for use as policy classes
   // in templated code
   struct SameClassId {
     inline static bool compatible(const ClassId &id1, const ClassId &id2) { return id1.name() == id2.name(); }
   };
 
   struct SameClassName {
     inline static bool compatible(const ClassId &id1, const ClassId &id2) { return id1 == id2; }
   };
 
   // Specialize the following template in order to be able to construct
   // ClassId for classes which do not implement static functions
   // "classname()" and "version()".
   template <class T>
   struct ClassIdSpecialization {
     inline static ClassId classId(const bool isPtr = false) { return ClassId(T::classname(), T::version(), isPtr); }
   };
 
   // Utility functions for naming template classes. The "nInclude"
   // argument tells us how many template parameters to include into
   // the generated template name. For example, use of
   //
   // template_class_name<X,Y>("myTemplate",1)
   //
   // will generate a class name which looks like myTemplate<X>, with
   // second template parameter omitted. While the result is equivalent
   // to invoking "template_class_name<X>("myTemplate")", having an
   // explicit limit is convenient for use from certain higher-level
   // functions. Note, however, that in the call with two template
   // parameters the class id specialization for Y must be available,
   // even though it is not used.
   //
   // This feature is sometimes helpful when certain template parameters
   // specify aspects of template behavior which have nothing to do
   // with object data contents and I/O. Typical example of such
   // a parameter is std::allocator of STL -- changing this to a custom
   // allocator will not affect serialized representation of an STL
   // container.
   //
   template <class T>
   std::string template_class_name(const char *templateName, unsigned nInclude = 1);
   template <class T>
   std::string template_class_name(const std::string &templateName, unsigned nInclude = 1);
   template <class T1, class T2>
   std::string template_class_name(const char *templateName, unsigned nInclude = 2);
   template <class T1, class T2>
   std::string template_class_name(const std::string &templateName, unsigned nInclude = 2);
   template <class T1, class T2, class T3>
   std::string template_class_name(const char *templateName, unsigned nInclude = 3);
   template <class T1, class T2, class T3>
   std::string template_class_name(const std::string &templateName, unsigned nInclude = 3);
   template <class T1, class T2, class T3, class T4>
   std::string template_class_name(const char *templateName, unsigned nInclude = 4);
   template <class T1, class T2, class T3, class T4>
   std::string template_class_name(const std::string &templateName, unsigned nInclude = 4);
   template <class T1, class T2, class T3, class T4, class T5>
   std::string template_class_name(const char *templateName, unsigned nInclude = 5);
   template <class T1, class T2, class T3, class T4, class T5>
   std::string template_class_name(const std::string &templateName, unsigned nInclude = 5);
   template <class T1, class T2, class T3, class T4, class T5, class T6>
   std::string template_class_name(const char *templateName, unsigned nInclude = 6);
   template <class T1, class T2, class T3, class T4, class T5, class T6>
   std::string template_class_name(const std::string &templateName, unsigned nInclude = 6);
 
   // Utility functions for naming stack-based containers such as std::array
   template <class T, std::size_t N>
   std::string stack_container_name(const char *templateName);
 
   template <class T, std::size_t N>
   std::string stack_container_name(const std::string &templateName);
 }  // namespace gs
 
 #include <cassert>
 #include <sstream>
 #include <utility>
 #include <vector>
 
 #include "Alignment/Geners/interface/IOIsAnyPtr.hh"
 #include "Alignment/Geners/interface/IOIsClassType.hh"
 
 #ifdef GENERS_EMPTY_TYPE_QUALIFYER_
 #undef GENERS_EMPTY_TYPE_QUALIFYER_
 #endif
 
 #define GENERS_EMPTY_TYPE_QUALIFYER_
 
 // Specializations of "ClassIdSpecialization" for built-in classes.
 // They all look the same, so we want to use a macro
 #define gs_specialize_class_helper(qualifyer, name, version) /**/                                      \
   template <>                                                                                          \
   struct ClassIdSpecialization<qualifyer name> {                                                       \
     inline static ClassId classId(const bool isPtr = false) { return ClassId(#name, version, isPtr); } \
   };
 
 #define gs_specialize_class_id(name, version) /**/                                                           \
   namespace gs {                                                                                             \
     gs_specialize_class_helper(GENERS_EMPTY_TYPE_QUALIFYER_, name, version)                                  \
         gs_specialize_class_helper(const, name, version) gs_specialize_class_helper(volatile, name, version) \
             gs_specialize_class_helper(const volatile, name, version)                                        \
   }
 
 // Specializations of "ClassIdSpecialization" for single-argument templates
 #define gs_specialize_template_help_T(qualifyer, name, version, MAX) /**/ \
   template <class T>                                                      \
   struct ClassIdSpecialization<qualifyer name<T>> {                       \
     inline static ClassId classId(const bool isPtr = false) {             \
       return ClassId(template_class_name<T>(#name, MAX), version, isPtr); \
     }                                                                     \
   };
 
 #define gs_specialize_template_id_T(name, version, MAX) /**/                        \
   namespace gs {                                                                    \
     gs_specialize_template_help_T(GENERS_EMPTY_TYPE_QUALIFYER_, name, version, MAX) \
         gs_specialize_template_help_T(const, name, version, MAX)                    \
             gs_specialize_template_help_T(volatile, name, version, MAX)             \
                 gs_specialize_template_help_T(const volatile, name, version, MAX)   \
   }
 
 // Specializations of "ClassIdSpecialization" for two-argument templates
 #define gs_specialize_template_help_TT(qualifyer, name, version, MAX) /**/   \
   template <class T, class U>                                                \
   struct ClassIdSpecialization<qualifyer name<T, U>> {                       \
     inline static ClassId classId(const bool isPtr = false) {                \
       return ClassId(template_class_name<T, U>(#name, MAX), version, isPtr); \
     }                                                                        \
   };
 
 #define gs_specialize_template_id_TT(name, version, MAX) /**/                        \
   namespace gs {                                                                     \
     gs_specialize_template_help_TT(GENERS_EMPTY_TYPE_QUALIFYER_, name, version, MAX) \
         gs_specialize_template_help_TT(const, name, version, MAX)                    \
             gs_specialize_template_help_TT(volatile, name, version, MAX)             \
                 gs_specialize_template_help_TT(const volatile, name, version, MAX)   \
   }
 
 // Specializations of "ClassIdSpecialization" for three-argument templates
 #define gs_specialize_template_help_TTT(qualifyer, name, version, MAX) /**/     \
   template <class T, class U, class V>                                          \
   struct ClassIdSpecialization<qualifyer name<T, U, V>> {                       \
     inline static ClassId classId(const bool isPtr = false) {                   \
       return ClassId(template_class_name<T, U, V>(#name, MAX), version, isPtr); \
     }                                                                           \
   };
 
 #define gs_specialize_template_id_TTT(name, version, MAX) /**/                        \
   namespace gs {                                                                      \
     gs_specialize_template_help_TTT(GENERS_EMPTY_TYPE_QUALIFYER_, name, version, MAX) \
         gs_specialize_template_help_TTT(const, name, version, MAX)                    \
             gs_specialize_template_help_TTT(volatile, name, version, MAX)             \
                 gs_specialize_template_help_TTT(const volatile, name, version, MAX)   \
   }
 
 // Specializations of "ClassIdSpecialization" for four-argument templates
 #define gs_specialize_template_help_TTTT(qualifyer, name, version, MAX) /**/       \
   template <class T, class U, class V, class X>                                    \
   struct ClassIdSpecialization<qualifyer name<T, U, V, X>> {                       \
     inline static ClassId classId(const bool isPtr = false) {                      \
       return ClassId(template_class_name<T, U, V, X>(#name, MAX), version, isPtr); \
     }                                                                              \
   };
 
 #define gs_specialize_template_id_TTTT(name, version, MAX) /**/                        \
   namespace gs {                                                                       \
     gs_specialize_template_help_TTTT(GENERS_EMPTY_TYPE_QUALIFYER_, name, version, MAX) \
         gs_specialize_template_help_TTTT(const, name, version, MAX)                    \
             gs_specialize_template_help_TTTT(volatile, name, version, MAX)             \
                 gs_specialize_template_help_TTTT(const volatile, name, version, MAX)   \
   }
 
 // Specializations of "ClassIdSpecialization" for five-argument templates
 #define gs_specialize_template_hlp_TTTTT(qualifyer, name, version, MAX) /**/          \
   template <class T, class U, class V, class X, class Y>                              \
   struct ClassIdSpecialization<qualifyer name<T, U, V, X, Y>> {                       \
     inline static ClassId classId(const bool isPtr = false) {                         \
       return ClassId(template_class_name<T, U, V, X, Y>(#name, MAX), version, isPtr); \
     }                                                                                 \
   };
 
 #define gs_specialize_template_id_TTTTT(name, version, MAX) /**/                       \
   namespace gs {                                                                       \
     gs_specialize_template_hlp_TTTTT(GENERS_EMPTY_TYPE_QUALIFYER_, name, version, MAX) \
         gs_specialize_template_hlp_TTTTT(const, name, version, MAX)                    \
             gs_specialize_template_hlp_TTTTT(volatile, name, version, MAX)             \
                 gs_specialize_template_hlp_TTTTT(const volatile, name, version, MAX)   \
   }
 
 // Specializations of "ClassIdSpecialization" for six-argument templates
 #define gs_specialize_template_h_TTTTTT(qualifyer, name, version, MAX) /**/              \
   template <class T, class U, class V, class X, class Y, class Z>                        \
   struct ClassIdSpecialization<qualifyer name<T, U, V, X, Y, Z>> {                       \
     inline static ClassId classId(const bool isPtr = false) {                            \
       return ClassId(template_class_name<T, U, V, X, Y, Z>(#name, MAX), version, isPtr); \
     }                                                                                    \
   };
 
 #define gs_specialize_template_id_TTTTTT(name, version, MAX) /**/                     \
   namespace gs {                                                                      \
     gs_specialize_template_h_TTTTTT(GENERS_EMPTY_TYPE_QUALIFYER_, name, version, MAX) \
         gs_specialize_template_h_TTTTTT(const, name, version, MAX)                    \
             gs_specialize_template_h_TTTTTT(volatile, name, version, MAX)             \
                 gs_specialize_template_h_TTTTTT(const volatile, name, version, MAX)   \
   }
 
 // Specializations of "ClassIdSpecialization" for two-argument templates
 // which include an integer as a second argument (like std::array)
 #define gs_specialize_template_help_TN(qualifyer, name, version, MAX) /**/    \
   template <class T, std::size_t N>                                           \
   struct ClassIdSpecialization<qualifyer name<T, N>> {                        \
     inline static ClassId classId(const bool isPtr = false) {                 \
       return ClassId(stack_container_name<T, N>(#name, MAX), version, isPtr); \
     }                                                                         \
   };
 
 #define gs_specialize_template_id_TN(name, version, MAX) /**/                        \
   namespace gs {                                                                     \
     gs_specialize_template_help_TN(GENERS_EMPTY_TYPE_QUALIFYER_, name, version, MAX) \
         gs_specialize_template_help_TN(const, name, version, MAX)                    \
             gs_specialize_template_help_TN(volatile, name, version, MAX)             \
                 gs_specialize_template_help_TN(const volatile, name, version, MAX)   \
   }
 
 namespace gs {
   // "template_class_name" implementations
   template <class T>
   std::string template_class_name(const char *templateName, const unsigned nInclude) {
     assert(templateName);
     std::string name(templateName);
     if (nInclude) {
       name += '<';
       const ClassId &id(ClassIdSpecialization<T>::classId());
       name += id.id();
       name += '>';
     }
     return name;
   }
 
   template <class T>
   inline std::string template_class_name(const std::string &templateName, const unsigned nInclude) {
     return template_class_name<T>(templateName.c_str(), nInclude);
   }
 
   template <class T1, class T2>
   std::string template_class_name(const char *templateName, const unsigned nInclude) {
     assert(templateName);
     std::string name(templateName);
     if (nInclude) {
       name += '<';
       const ClassId &id1(ClassIdSpecialization<T1>::classId());
       name += id1.id();
       if (nInclude > 1) {
         name += ',';
         const ClassId &id2(ClassIdSpecialization<T2>::classId());
         name += id2.id();
       }
       name += '>';
     }
     return name;
   }
 
   template <class T1, class T2>
   inline std::string template_class_name(const std::string &templateName, const unsigned nInclude) {
     return template_class_name<T1, T2>(templateName.c_str(), nInclude);
   }
 
   template <class T1, class T2, class T3>
   std::string template_class_name(const char *templateName, const unsigned nInclude) {
     assert(templateName);
     std::string name(templateName);
     if (nInclude) {
       name += '<';
       const ClassId &id1(ClassIdSpecialization<T1>::classId());
       name += id1.id();
       if (nInclude > 1) {
         name += ',';
         const ClassId &id2(ClassIdSpecialization<T2>::classId());
         name += id2.id();
       }
       if (nInclude > 2) {
         name += ',';
         const ClassId &id3(ClassIdSpecialization<T3>::classId());
         name += id3.id();
       }
       name += '>';
     }
     return name;
   }
 
   template <class T1, class T2, class T3>
   inline std::string template_class_name(const std::string &templateName, const unsigned nInclude) {
     return template_class_name<T1, T2, T3>(templateName.c_str(), nInclude);
   }
 
   template <class T1, class T2, class T3, class T4>
   std::string template_class_name(const char *templateName, const unsigned nInclude) {
     assert(templateName);
     std::string name(templateName);
     if (nInclude) {
       name += '<';
       const ClassId &id1(ClassIdSpecialization<T1>::classId());
       name += id1.id();
       if (nInclude > 1) {
         name += ',';
         const ClassId &id2(ClassIdSpecialization<T2>::classId());
         name += id2.id();
       }
       if (nInclude > 2) {
         name += ',';
         const ClassId &id3(ClassIdSpecialization<T3>::classId());
         name += id3.id();
       }
       if (nInclude > 3) {
         name += ',';
         const ClassId &id4(ClassIdSpecialization<T4>::classId());
         name += id4.id();
       }
       name += '>';
     }
     return name;
   }
 
   template <class T1, class T2, class T3, class T4>
   inline std::string template_class_name(const std::string &templateName, const unsigned n) {
     return template_class_name<T1, T2, T3, T4>(templateName.c_str(), n);
   }
 
   template <class T1, class T2, class T3, class T4, class T5>
   std::string template_class_name(const char *templateName, const unsigned nInclude) {
     assert(templateName);
     std::string name(templateName);
     if (nInclude) {
       name += '<';
       const ClassId &id1(ClassIdSpecialization<T1>::classId());
       name += id1.id();
       if (nInclude > 1) {
         name += ',';
         const ClassId &id2(ClassIdSpecialization<T2>::classId());
         name += id2.id();
       }
       if (nInclude > 2) {
         name += ',';
         const ClassId &id3(ClassIdSpecialization<T3>::classId());
         name += id3.id();
       }
       if (nInclude > 3) {
         name += ',';
         const ClassId &id4(ClassIdSpecialization<T4>::classId());
         name += id4.id();
       }
       if (nInclude > 4) {
         name += ',';
         const ClassId &id5(ClassIdSpecialization<T5>::classId());
         name += id5.id();
       }
       name += '>';
     }
     return name;
   }
 
   template <class T1, class T2, class T3, class T4, class T5>
   inline std::string template_class_name(const std::string &templateName, const unsigned n) {
     return template_class_name<T1, T2, T3, T4, T5>(templateName.c_str(), n);
   }
 
   template <class T1, class T2, class T3, class T4, class T5, class T6>
   std::string template_class_name(const char *templateName, const unsigned nInclude) {
     assert(templateName);
     std::string name(templateName);
     if (nInclude) {
       name += '<';
       const ClassId &id1(ClassIdSpecialization<T1>::classId());
       name += id1.id();
       if (nInclude > 1) {
         name += ',';
         const ClassId &id2(ClassIdSpecialization<T2>::classId());
         name += id2.id();
       }
       if (nInclude > 2) {
         name += ',';
         const ClassId &id3(ClassIdSpecialization<T3>::classId());
         name += id3.id();
       }
       if (nInclude > 3) {
         name += ',';
         const ClassId &id4(ClassIdSpecialization<T4>::classId());
         name += id4.id();
       }
       if (nInclude > 4) {
         name += ',';
         const ClassId &id5(ClassIdSpecialization<T5>::classId());
         name += id5.id();
       }
       if (nInclude > 5) {
         name += ',';
         const ClassId &id6(ClassIdSpecialization<T6>::classId());
         name += id6.id();
       }
       name += '>';
     }
     return name;
   }
 
   template <class T1, class T2, class T3, class T4, class T5, class T6>
   inline std::string template_class_name(const std::string &templateName, const unsigned n) {
     return template_class_name<T1, T2, T3, T4, T5, T6>(templateName.c_str(), n);
   }
 
   template <class T, std::size_t N>
   std::string stack_container_name(const char *templateName) {
     assert(templateName);
     const ClassId &id1(ClassIdSpecialization<T>::classId());
     std::ostringstream os;
     os << templateName << '<' << id1.id() << ',' << N << "(0)>";
     return os.str();
   }
 
   template <class T, std::size_t N>
   std::string stack_container_name(const std::string &templateName) {
     return stack_container_name<T, N>(templateName.c_str());
   }
 
   // Skip references in class ids
   template <class T>
   struct ClassIdSpecialization<T &> {
     inline static ClassId classId(const bool isPtr = false) { return ClassIdSpecialization<T>::classId(isPtr); }
   };
 
   // Skip pointers in class ids
   template <class T>
   struct ClassIdSpecialization<T *> {
     inline static ClassId classId(const bool /* isPtr */ = false) { return ClassIdSpecialization<T>::classId(true); }
   };
 
   template <class T>
   struct ClassIdSpecialization<T *const> {
     inline static ClassId classId(const bool /* isPtr */ = false) { return ClassIdSpecialization<T>::classId(true); }
   };
 
   template <class T>
   struct ClassIdSpecialization<T *volatile> {
     inline static ClassId classId(const bool /* isPtr */ = false) { return ClassIdSpecialization<T>::classId(true); }
   };
 
   template <class T>
   struct ClassIdSpecialization<T *const volatile> {
     inline static ClassId classId(const bool /* isPtr */ = false) { return ClassIdSpecialization<T>::classId(true); }
   };
 
   // Skip shared pointers in class ids
   template <class T>
   struct ClassIdSpecialization<std::shared_ptr<T>> {
     inline static ClassId classId(const bool /* isPtr */ = false) { return ClassIdSpecialization<T>::classId(true); }
   };
 
   template <class T>
   struct ClassIdSpecialization<const std::shared_ptr<T>> {
     inline static ClassId classId(const bool /* isPtr */ = false) { return ClassIdSpecialization<T>::classId(true); }
   };
 
   template <class T>
   struct ClassIdSpecialization<volatile std::shared_ptr<T>> {
     inline static ClassId classId(const bool /* isPtr */ = false) { return ClassIdSpecialization<T>::classId(true); }
   };
 
   template <class T>
   struct ClassIdSpecialization<const volatile std::shared_ptr<T>> {
     inline static ClassId classId(const bool /* isPtr */ = false) { return ClassIdSpecialization<T>::classId(true); }
   };
 
   // Skip IOPtr in class ids and do not turn on the pointer flag
   template <class T>
   struct ClassIdSpecialization<IOPtr<T>> {
     inline static ClassId classId(const bool isPtr = false) { return ClassIdSpecialization<T>::classId(isPtr); }
   };
 
   template <class T>
   struct ClassIdSpecialization<const IOPtr<T>> {
     inline static ClassId classId(const bool isPtr = false) { return ClassIdSpecialization<T>::classId(isPtr); }
   };
 
   template <class T>
   struct ClassIdSpecialization<volatile IOPtr<T>> {
     inline static ClassId classId(const bool isPtr = false) { return ClassIdSpecialization<T>::classId(isPtr); }
   };
 
   template <class T>
   struct ClassIdSpecialization<const volatile IOPtr<T>> {
     inline static ClassId classId(const bool isPtr = false) { return ClassIdSpecialization<T>::classId(isPtr); }
   };
 
   // Same thing for IOProxy
   template <class T>
   struct ClassIdSpecialization<IOProxy<T>> {
     inline static ClassId classId(const bool isPtr = false) { return ClassIdSpecialization<T>::classId(isPtr); }
   };
 
   template <class T>
   struct ClassIdSpecialization<const IOProxy<T>> {
     inline static ClassId classId(const bool isPtr = false) { return ClassIdSpecialization<T>::classId(isPtr); }
   };
 
   template <class T>
   struct ClassIdSpecialization<volatile IOProxy<T>> {
     inline static ClassId classId(const bool isPtr = false) { return ClassIdSpecialization<T>::classId(isPtr); }
   };
 
   template <class T>
   struct ClassIdSpecialization<const volatile IOProxy<T>> {
     inline static ClassId classId(const bool isPtr = false) { return ClassIdSpecialization<T>::classId(isPtr); }
   };
 
   // The remaining ClassId static functions
   template <class T>
   inline ClassId ClassId::makeId() {
     return ClassIdSpecialization<T>::classId();
   }
 
   namespace Private {
     template <bool, class T>
     struct CallClassId {
       static inline ClassId get(const T &) { return ClassIdSpecialization<T>::classId(); }
     };
 
     template <class T>
     struct CallClassId<true, T> {
       static inline ClassId get(const T &obj) { return obj.classId(); }
     };
 
     // The following class will check for the existence of two
     // possible signatures of the "classId" method:
     // "const ClassId& classId() const" and "ClassId classId() const".
     template <class Tp>
     class TypeHasClassIdHelper {
       template <typename T, T>
       struct TypeCheck;
       template <typename T>
       struct FcnType1 {
         typedef ClassId (T::*fptr)() const;
       };
       template <typename T>
       struct FcnType2 {
         typedef const ClassId &(T::*fptr)() const;
       };
 
       typedef char Yes;
       typedef struct {
         char a[2];
       } No;
 
       template <typename T>
       static Yes Has1(TypeCheck<typename FcnType1<T>::fptr, &T::classId> *);
       template <typename T>
       static No Has1(...);
 
       template <typename T>
       static Yes Has2(TypeCheck<typename FcnType2<T>::fptr, &T::classId> *);
       template <typename T>
       static No Has2(...);
 
     public:
       static const bool value = ((sizeof(Has1<Tp>(0)) == sizeof(Yes)) || (sizeof(Has2<Tp>(0)) == sizeof(Yes)));
     };
 
     template <class T, bool b = IOIsClassType<T>::value>
     struct TypeHasClassId {
       static const bool value = false;
     };
 
     template <typename T>
     struct TypeHasClassId<T, true> {
       static const bool value = TypeHasClassIdHelper<T>::value;
     };
   }  // namespace Private
 
   template <class T>
   inline ClassId ClassId::itemId(const T &item) {
     // Make sure that item is not a pointer.
     static_assert((!IOIsAnyPtr<T>::value), "can not use pointers with this method");
 
     // If the classId() function is avalable for this item, call it
     // (it could be virtual). Otherwise, call the generic method.
     return Private::CallClassId<Private::TypeHasClassId<T>::value, T>::get(item);
   }
 }  // namespace gs
 
 // Class ids for standard types
 gs_specialize_class_id(float, 0) gs_specialize_class_id(double, 0) gs_specialize_class_id(long double, 0)
     gs_specialize_class_id(int, 0) gs_specialize_class_id(unsigned, 0) gs_specialize_class_id(long, 0)
         gs_specialize_class_id(long long, 0) gs_specialize_class_id(unsigned long, 0)
             gs_specialize_class_id(unsigned long long, 0) gs_specialize_class_id(short, 0)
                 gs_specialize_class_id(unsigned short, 0) gs_specialize_class_id(bool, 0)
                     gs_specialize_class_id(char, 0) gs_specialize_class_id(unsigned char, 0)
                         gs_specialize_class_id(signed char, 0) gs_specialize_class_id(void, 0)
                             gs_specialize_class_id(std::string, 0)
 
     // Class ids for some standard library templates
     // used by this I/O package
     gs_specialize_template_id_T(std::less, 0, 1) gs_specialize_template_id_T(std::equal_to, 0, 1)
         gs_specialize_template_id_T(std::allocator, 0, 1) gs_specialize_template_id_T(std::char_traits, 0, 1)
             gs_specialize_template_id_TT(std::vector, 0, 1) gs_specialize_template_id_TT(std::pair, 0, 2)
                 gs_specialize_template_id_TTT(std::basic_string, 0, 2)
 
 #endif  // GENERS_CLASSID_HH_

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