Guid.h

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#ifndef FWCOre_Utilities_Guid_h
#define FWCOre_Utilities_Guid_h

#include <string>

/*
 *  copied from pool
 */
namespace edm  {

  class Guid {          // size is 16
  public:
    unsigned int  Data1;
    unsigned short Data2;
    unsigned short Data3;
    unsigned char  Data4[8];

    Guid() { init(); }
    explicit Guid(bool)  { init(); }
    explicit Guid(char const* s)        { fromString(s);          }
    explicit Guid(std::string const& s) { fromString(s);          }
    Guid(Guid const& c)                 { *this = c;              }
    Guid& operator=(Guid const& g) {
      if (this != &g)  {
        Data1 = g.Data1;
        Data2 = g.Data2;
        Data3 = g.Data3;
        unsigned int      * p = reinterpret_cast<unsigned int *>(&Data4[0]);
        unsigned int const* q = reinterpret_cast<unsigned int const*>(&g.Data4[0]);
        *(p+1) = *(q+1);
        *p     = *q;
      }
      return *this;
    }
    bool operator<(Guid const& g) const;
    bool operator==(Guid const& g) const {
      if (this != & g)  {
        if (Data1 != g.Data1) return false;
        if (Data2 != g.Data2) return false;
        if (Data3 != g.Data3) return false;
        unsigned int const* p = reinterpret_cast<unsigned int const*>(&Data4[0]);
        unsigned int const* q = reinterpret_cast<unsigned int const*>(&g.Data4[0]);
        return *p == *q && *(p+1) == *(q+1);
      }
      return true;
    }
    bool operator!=(Guid const& g) const {
      return !(this->operator == (g));
    }
    std::string const toString() const;
    Guid const& fromString(std::string const& s);
    private:
    void init();
  };
}
#endif