SeparateChaining.cpp

#include "SeparateChaining.h"
#include <iostream>
using namespace std;


/**
 * Internal method to test if a positive number is prime.
 * Not an efficient algorithm.
 */
bool isPrime( int n )
{
    if( n == 2 || n == 3 )
        return true;

    if( n == 1 || n % 2 == 0 )
        return false;

    for( int i = 3; i * i <= n; i += 2 )
        if( n % i == 0 )
            return false;

    return true;
}

/**
 * Internal method to return a prime number at least as large as n.
 * Assumes n > 0.
 */
int nextPrime( int n )
{
    if( n % 2 == 0 )
        ++n;

    for( ; !isPrime( n ); n += 2 )
        ;

    return n;
}

/**
 * A hash routine for string objects.
 */
size_t hash( const string & key )
{
    size_t hashVal = 0;

    for( char ch : key )
        hashVal = 37 * hashVal + ch;

    return hashVal;
}

/**
 * A hash routine for ints.
 */
size_t hash( long long key )
{
    return key;
}