Common/interface/Uninitialized.h

0001 #ifndef DataFormats_Common_interface_Uninitialized_h
0002 #define DataFormats_Common_interface_Uninitialized_h
0003
0004 /* Uninitialized
0005  *
0006  * This is an empty struct used as a tag to signal that a constructor will leave an object (partially) uninitialised,
0007  * with the assumption that it will be overwritten before being used.
0008  * One expected use case is to replace the default constructor used when deserialising objects from a ROOT file.
0009  */
0010
0011 namespace edm {
0012
0013   struct Uninitialized {};
0014
0015   constexpr inline Uninitialized kUninitialized;
0016
0017 }  // namespace edm
0018
0019 #endif  // DataFormats_Common_interface_Uninitialized_h