testDynHash.C

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/* Aleph-w
 
     / \  | | ___ _ __ | |__      __      __
    / _ \ | |/ _ \ '_ \| '_ \ ____\ \ /\ / / Data structures & Algorithms
   / ___ \| |  __/ |_) | | | |_____\ V  V /  version 1.9c
  /_/   \_\_|\___| .__/|_| |_|      \_/\_/   https://github.com/lrleon/Aleph-w
                 |_|         
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2018 Leandro Rabindranath Leon 
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
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  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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  SOFTWARE.
*/
 
# include <tpl_dynLhash.H>
# include <tpl_dynArray.H>
# include <iostream>
# include <string>
# include <ctime>
# include <cstdlib>
 
# define NumItems 10000
 
# include <cassert>
using namespace std;
 
typedef DynLhashTable<unsigned, unsigned> HTable;
 
static size_t hashFct(const unsigned & key)
{
  return key;
}
 
static void testResize(HTable& table)
{
  if (table.get_num_busy_slots() > (99*table.capacity())/100 
      and table.size()/table.capacity() > 3)
    {
      unsigned long currSize = table.capacity();
      cout << "Resizing hash table from " << currSize << " ... ";
      cout << table.resize(1.5 * table.capacity()) << endl;
    }
}
 
static void printPars(const HTable& table)
{
  cout << "Table length = " << table.capacity() << endl
       << "Busy slots   = " << table.get_num_busy_slots() << endl
       << "Num items    = " << table.size() << endl;
}
 
int main(int argc, char *argv[])
{
  Primes::check_primes_database();
 
  int n = NumItems;
  unsigned int t = std::time(NULL);
 
  try 
    {
      if (argc > 1)
  n = std::stoi(argv[1]);
 
      if (argc > 2)
  t = std::stoi(argv[2]);
    }
  catch (...)
    {
      // ignore
    }
 
  if (n <= 0)
    {
      cout << "n must be positive" << endl;
      return 1;
    }
 
  srand(t);
 
  cout << argv[0] << " " << n << " " << t << endl;
 
  HTable table(1.15*n, hashFct);
  DynArray<unsigned int> keys(n);
  unsigned int i;
  unsigned int foundCounter = 0;
 
  for (i = 0; i < n/2; i++)
    {
      keys[i] = rand();
      testResize(table);
      if (table.search(keys(i)) == NULL)
    assert(table.insert(keys[i], i) != NULL);
      else
  foundCounter++;
    }
 
  cout << foundCounter << " duplicated numbers" << endl;
 
  assert( table.size() + foundCounter == n/2);
  printPars(table);
 
  for (i = n/2; i < n; i++)
    {
      keys[i] = rand();
      testResize(table);
      table[keys[i]] = i;
      table[keys[i]] = table[keys[i]];
    }
    
  printPars(table);
    
  unsigned * ptr;
  foundCounter = 0;
  for (i = 0; i < n; i++)
    {
      ptr = table.search(keys[i]);
      if (ptr != NULL)
  table.remove(ptr);
      else
  foundCounter++;
    }
}