SimPHash/Src/Hash/UL1/SplitMix.mqh

//+------------------------------------------------------------------+
//|                                                     SplitMix.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_SPLITMIX_MQH
#define SIMPHASH_SRC_HASH_UL1_SPLITMIX_MQH

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

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
namespace TSN
{
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class CHash1SplitMix : public IHashGeneratorWSeed
 {
public:
                     CHash1SplitMix(void) {}
                    ~CHash1SplitMix(void) {}

  ulong              Hash(ulong v, const ulong seed) override final
   {
    v += seed * 0x9e3779b97f4a7c15;
    v = (v ^ (v >> 30)) * 0xbf58476d1ce4e5b9;
    v = (v ^ (v >> 27)) * 0x94d049bb133111eb;
    return v ^ (v >> 31);
   }

  void               BuildString(string& data, const string& table_seeds_name) override final
   {
    data += "//---\r\n";
    data += StringFormat("  ulong h = key_hash + %s[seed_index] * 0x9e3779b97f4a7c15;\r\n", table_seeds_name);
    data += "  h = (h ^ (h >> 30)) * 0xbf58476d1ce4e5b9;\r\n";
    data += "  h = (h ^ (h >> 27)) * 0x94d049bb133111eb;\r\n";
    data += "  h ^= (h >> 31);\r\n";
    data += "\r\n";
   }
  void               AddIncludes(string& data) override final
   {
    // Nada
   }
 };
}
//+------------------------------------------------------------------+
#endif // SIMPHASH_SRC_HASH_UL1_SPLITMIX_MQH