hashstring.h File Reference

#include <cstdint>
#include "hash.h"
#include "future_compat.h"

Go to the source code of this file.

Classes
struct	substring

Functions
VW_STD14_CONSTEXPR uint64_t	hashall (substring s, uint64_t h)
VW_STD14_CONSTEXPR uint64_t	hashstring (substring s, uint64_t h)

Function Documentation

hashall()

VW_STD14_CONSTEXPR uint64_t hashall ( substring  s, uint64_t  h  )

inline

Definition at line 13 of file hashstring.h.

References substring::begin, substring::end, and uniform_hash().

Referenced by getHasher().

{
  return uniform_hash((unsigned char*)s.begin, s.end - s.begin, h);
}

hashstring()

VW_STD14_CONSTEXPR uint64_t hashstring ( substring  s, uint64_t  h  )

inline

Definition at line 18 of file hashstring.h.

References substring::begin, substring::end, and uniform_hash().

Referenced by vw_slim::example_predict_builder::example_predict_builder(), getHasher(), TC_parser< audit >::maybeFeature(), CB::parse_label(), COST_SENSITIVE::parse_label(), CB_EVAL::parse_label(), and vw_slim::example_predict_builder::push_feature_string().

{
  // trim leading whitespace but not UTF-8
  for (; s.begin < s.end && *(s.begin) <= 0x20 && (int)*(s.begin) >= 0; s.begin++)
    ;
  // trim trailing white space but not UTF-8
  for (; s.end > s.begin && *(s.end - 1) <= 0x20 && (int)*(s.end - 1) >= 0; s.end--)
    ;

  size_t ret = 0;
  char* p = s.begin;
  while (p != s.end)
    if (*p >= '0' && *p <= '9')
      ret = 10 * ret + *(p++) - '0';
    else
      return uniform_hash((unsigned char*)s.begin, s.end - s.begin, h);

  return ret + h;
}