/*================================================================================ hat container example program       http://home.comcast.net/~anglewyrm/hat.html PROBLEM:   Given a set of treasures, and monsters which specifiy their chances of each,   roll up a random treasure according to that monster's level.      Each monster class can have it's own subset of the treasure types available,   with differing probabilities. This way a ThunderChicken isn't carrying a sword.================================================================================*/#include <cstdlib>  // system#include <iostream> // cout#include "hat.h"    // hatusing namespace std;////////////////////////////////////////////////////////////////////////////////// Master treasure list// one type of treasure is coinsint coins[] = { 1, 2, 3, 5, 7, 11 };         // prime number coin countsenum {cp_1, cp_2, cp_3, cp_5, cp_7, cp_11 }; // for clarity in monster definitions////////////////////////////////////////////////////////////////////////////////// Mainint main(){    // create two treasure possibilities: poor and rich        // poor    float poor_dist[3][2] = { {cp_1, 0.50}, {cp_2, 0.30}, {cp_3, 0.20}};    hat<int>poor;    for( int i=0; i<3; i++) {        poor.put_normalized( (int)poor_dist[0], poor_dist[1] );    }        // rich    float rich_dist[6][2] = {         {cp_1,0.15}, {cp_2, 0.10}, {cp_3, 0.15},        {cp_5,0.30}, {cp_7, 0.20}, {cp_11, 0.10}    };        hat<int>rich;    for( int i=0; i<6; i++) {        rich.put_normalized( (int)rich_dist[0], rich_dist[1] );    }        // initialize random number generator    srand( time(NULL) ); rand();        // roll up a poor and a rich level-3 monster    int poor_sum = 0, rich_sum = 0;    for( int i = 0; i < 3; i++ ){ // level three monsters get three rolls        poor_sum = poor_sum + coins[ poor.get() ];        rich_sum = rich_sum + coins[ rich.get() ];    }        // and our monsters have...    cout << "Rich orc has " << rich_sum << " copper pieces." << endl         << "Poor orc has " << poor_sum << " copper pieces." << endl;    cout << endl << endl;    system("pause");}

/*================================================================================ hat container example program       http://home.comcast.net/~anglewyrm/hat.html PROBLEM:   Use a custom random number generator,    and produce two independant random variables    using two instances with different seeds.================================================================================*/#include <cstdlib>  // system#include <iostream> // cout#include "hat.h"    // hatusing namespace std;////////////////////////////////////////////////////////////////////////////////// marginal improvement on std::rand()// This functor stores state information,// so that multiple instances can have different seeds.// NOTE: This class is not thread safe (because std::rand isn't); if multiple threads poll rand(),// then the sequence of numbers from a given seed won't be repeatable.class rng_class {public:    void seed( unsigned int s ){ current = s; };    unsigned int operator()(unsigned int range)    {        if ( range == 0 ) return 0; // only one possibility.        // save global rand state, and restore this instance's state        unsigned int global_state = rand();        srand( current );                       // handle cases where range doesn't evenly divide RAND_MAX,        unsigned int bucket_size = RAND_MAX / range;        unsigned int result;        do {           current = std::rand();            result = current / bucket_size;        }  while ( result >= range );                srand( global_state ); // restore global state                return result;    }    protected:    unsigned int current;};////////////////////////////////////////////////////////////////////////////////// Mainint main(){    // create two instances of my rng_class, and seed/initialize them    rng_class first_instance, second_instance;    first_instance.seed( 1234 );    second_instance.seed( 5678 );      // construct two hats that will use the above instances of custom rng_class        hat<string, rng_class> first( first_instance );    hat<string, rng_class> second( second_instance );        // put data into hat    string names[] = { "alpha", "bravo", "charlie", "delta", "echo", "foxtrot"};    for( int i=0; i<6; i++ )    {        first.put( names );        second.put( names );    }            // display a dozen random call signs from two independant random variables    for ( int i = 0; i < 12; i++ )    {       cout << first.get() << "\t" << second.get() << endl;    }                    cout << endl << endl;    system("pause");}

Quote:Original post by Anonymous Poster
I'M THE MAP!!! ...

/*================================================================================hat container example                http://home.comcast.net/~anglewyrm/hat.html  PROBLEM:      Apply several distributions to a given set.    ================================================================================*/#include <iostream> // cout, endl#include <iomanip>  // setw#include <string>   // string#include "hat.h"    // hat containerusing namespace std;int main(){    // A sorted set that we are going to draw from    string days[] = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday" };        // Make three different distributions over the subscript,    // so that we can swap in different curves over our data        // first distribution: equal chances of returning any index    hat<size_t> even_chances;    for( int i=0; i<5; i++ ){        even_chances.put( i ); // each offset has default weight of 1 chance    }        // second distribution: skip Tuesdays and Thursays, double chance of Friday    hat<size_t> skip;    size_t indexes[] = { 0, 2, 4 };    size_t weights[] = { 1, 1, 2 };    for( int i=0; i<3; i++ ){        skip.put( indexes, weights );    }            // third distribution: calculated slope using a formula    // ( this formula happens to produce 1/15, 2/15, 3/15, 4/15, 5/15 )    hat<size_t> slope;    for( int i=0; i<5; i++ ){        slope.put_normalized( i, float(i+1)/15.0 );    }        // Initialize random number generator    srand( time(NULL) ); rand();        // Now choose from days[] by using random indexes    for( int i=0; i<20; i++ )    {        // display even chances        cout << setw(10)             << days[ even_chances.get() ];                // second column no Tuesdays or Thursdays        cout << setw(10)             << days[ skip.get() ];                // third column higher chances toward end of week        cout << setw(10)             << days[ slope.get() ];                cout << endl;    }                 cout << endl << endl;    system("pause");}