resourceLib.h File Reference

#include <new>
#include <typeinfo>
#include <stdio.h>
#include <limits.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include "tsSLList.h"
#include "epicsString.h"
#include "libComAPI.h"

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Classes
class	resTableIter< T, ID >
class	resTableIterConst< T, ID >
class	resTable< T, ID >
class	resTableIter< T, ID >
class	resTableIterConst< T, ID >
class	intId< T, MIN_INDEX_WIDTH, MAX_ID_WIDTH >
class	chronIntId
class	chronIntIdResTable< ITEM >
class	chronIntIdRes< ITEM >
class	stringId

Typedefs
typedef size_t	resTableIndex

Functions
template<class T >
resTableIndex	integerHash (unsigned MIN_INDEX_WIDTH, unsigned MAX_ID_WIDTH, const T &id)

Typedef Documentation

typedef size_t resTableIndex

Definition at line 45 of file resourceLib.h.

Function Documentation

template<class T >

resTableIndex integerHash ( unsigned  MIN_INDEX_WIDTH, unsigned  MAX_ID_WIDTH, const T &  id  )

inline

Definition at line 1032 of file resourceLib.h.

{
    resTableIndex hashid = static_cast <resTableIndex> ( id );

    //
    // the intent here is to gurantee that all components of the
    // integer contribute even if the resTableIndex returned might
    // index a small table.
    //
    // On most compilers the optimizer will unroll this loop so this
    // is actually a very small inline function
    //
    // Experiments using the microsoft compiler show that this isnt
    // slower than switching on the architecture size and unrolling the
    // loop explicitly (that solution has resulted in portability
    // problems in the past).
    //
    unsigned width = MAX_ID_WIDTH;
    do {
        width >>= 1u;
        hashid ^= hashid>>width;
    } while (width>MIN_INDEX_WIDTH);

    //
    // the result here is always masked to the
    // proper size after it is returned to the "resTable" class
    //
    return hashid;
}