EventContextHash Class Reference

hash from EventContext so EvenContexts can be used as keys in unordered maps. More...

#include <GaudiKernel/EventContextHash.h>

Public Member Functions
size_t	hash (const EventContext &ctx) const
bool	equal (const EventContext &a, const EventContext &b) const
std::size_t	operator() (const EventContext &ctx) const
bool	operator() (const EventContext &ctx, const EventContext &ctxb) const

Detailed Description

hash from EventContext so EvenContexts can be used as keys in unordered maps.

Hash is crated by combining event number and event slot using the algorithm from boost::hash_combine()

Author

Sami Kama

Definition at line 13 of file EventContextHash.h.

Member Function Documentation

bool EventContextHash::equal ( const EventContext &  a, const EventContext &  b  ) const

inline

Definition at line 22 of file EventContextHash.h.

{ return hash( a ) == hash( b ); }

size_t EventContextHash::hash ( const EventContext &  ctx ) const

inline

Definition at line 16 of file EventContextHash.h.

  {
    size_t en = ctx.evt();
    size_t es = ctx.slot();
    return en ^ ( es + ( en << 6 ) + ( en >> 2 ) );
  }

std::size_t EventContextHash::operator() ( const EventContext &  ctx ) const

inline

Definition at line 24 of file EventContextHash.h.

{ return hash( ctx ); }

bool EventContextHash::operator() ( const EventContext &  ctx, const EventContext &  ctxb  ) const

inline

Definition at line 25 of file EventContextHash.h.

{ return equal( ctx, ctxb ); }

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The documentation for this class was generated from the following file:

• GaudiKernel/GaudiKernel/EventContextHash.h