SimPHash/Src/Hash/UL1/MurMur.mqh

//+------------------------------------------------------------------+
//|                                                       MurMur.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_MURMUR_MQH
#define SIMPHASH_SRC_HASH_UL1_MURMUR_MQH

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

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
namespace TSN
{
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class CHash1MurMur : public IHashGeneratorWSeed
 {
public:
                     CHash1MurMur(void) {}
                    ~CHash1MurMur(void) {}

  ulong              Hash(ulong v, const ulong seed) override final
   {
    v ^= seed;
    v ^= v >> 16;
    v *= 0x45d9f3b37197344d;
    v ^= v >> 16;
    v *= 0x45d9f3b37197344d;
    v ^= v >> 16;
    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 >> 16;\r\n";
    data += "  h *= 0x45d9f3b37197344d;\r\n";
    data += "  h ^= h >> 16;\r\n";
    data += "  h *= 0x45d9f3b37197344d;\r\n";
    data += "  h ^= h >> 16;\r\n";
    data += "\r\n";
   }
  void               AddIncludes(string& data) override final
   {
    // Nada
   }
 };

}
//+------------------------------------------------------------------+
#endif // SIMPHASH_SRC_HASH_UL1_MURMUR_MQH