SimPHash/Src/Hash/UL1/fmix.mqh

//+------------------------------------------------------------------+
//|                                                         fmix.mqh |
//|                                   Copyright 2026, Niquel Mendoza |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2026, Niquel Mendoza"
#property link      "https://www.mql5.com"
#property strict


#ifndef SIMPHASH_SRC_HASH_UL1_FMIX_MQH
#define SIMPHASH_SRC_HASH_UL1_FMIX_MQH

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
#include "..\\Def.mqh"

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
namespace TSN
{
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class CHash1Fmix : public IHashGeneratorWSeed
 {
public:
                     CHash1Fmix(void) {}
                    ~CHash1Fmix(void) {}

  ulong              Hash(ulong v, const ulong seed) override final
   {
    v ^= seed;
    v ^= v >> 33;
    v *= 0xff51afd7ed558ccd;
    v ^= v >> 33;
    v *= 0xc4ceb9fe1a85ec53;
    v ^= v >> 33;
    return v;
   }

  void               BuildString(string& data, const string& table_seeds_name) override final
   {
    data += "//---\r\n";
    data += StringFormat("  ulong h = key_hash ^ %s[seed_index];\r\n", table_seeds_name);
    data += "  h ^= h >> 33;\r\n";
    data += "  h *= 0xff51afd7ed558ccd\r\n";
    data += "  h ^= h >> 33;\r\n";
    data += "  h *= 0xc4ceb9fe1a85ec53;\r\n";
    data += "  h ^= h >> 33;\r\n";
    data += "\r\n";
   }
  void               AddIncludes(string& data) override final
   {
    // Nada
   }
 };
}

#endif // SIMPHASH_SRC_HASH_UL1_FMIX_MQH