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00001 #ifndef DataFormats_Provenance_Transient_h 00002 #define DataFormats_Provenance_Transient_h 00003 // -*- C++ -*- 00004 // 00005 // Package: Provenance 00006 // Class : Transient 00007 // 00017 // 00018 // Original Author: Bill Tanenbaum 00019 // Created: Sat Aug 18 17:30:08 EDT 2007 00020 // 00021 00022 // system include files 00023 00024 // user include files 00025 00026 // forward declarations 00027 namespace edm { 00028 00029 template <typename T> 00030 class Transient { 00031 public: 00032 typedef T value_type; 00033 Transient() : value_(T()) {} 00034 explicit Transient(T const& value) : value_(value) {} 00035 operator T() const { return value_; } 00036 Transient & operator=(T const& rh) { value_ = rh; return *this; } 00037 T const& get() const { return value_;} 00038 T & get() { return value_;} 00039 private: 00040 T value_; 00041 }; 00042 } 00043 #endif
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