libs/coroutine/example/symmetric/dice_game.cpp

   1
   2 //          Copyright Keld Helsgaun 2000, Oliver Kowalke 2014.
   3 // Distributed under the Boost Software License, Version 1.0.
   4 //    (See accompanying file LICENSE_1_0.txt or copy at
   5 //          http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <boost/coroutine/all.hpp>
   8
   9 #include <cstdlib>
  10 #include <iostream>
  11
  12 #include <boost/bind.hpp>
  13 #include <boost/move/move.hpp>
  14 #include <boost/random/random_device.hpp>
  15 #include <boost/random/uniform_int_distribution.hpp>
  16
  17 typedef boost::coroutines::symmetric_coroutine< void >  coro_t;
  18
  19 class player
  20 {
  21 private:
  22     int die()
  23     {
  24         boost::random::uniform_int_distribution<> dist( 1, 6);
  25         return dist( gen);
  26     }
  27
  28     void run_( coro_t::yield_type & yield)
  29     {
  30         int sum = 0;
  31         while ( ( sum += die() ) < 100)
  32             yield( nxt->coro);
  33         std::cout << "player " << id << " winns" << std::endl;
  34     }
  35
  36     player( player const&);
  37     player & operator=( player const&);
  38
  39 public:
  40     int                             id;
  41     player                      *   nxt;
  42     coro_t::call_type               coro;
  43     boost::random::random_device    gen;
  44
  45     player( int id_) :
  46         id( id_), nxt( 0),
  47         coro( boost::bind( & player::run_, this, _1) ),
  48         gen()
  49     {}
  50
  51     void run()
  52     { coro(); }
  53 };
  54
  55 int main( int argc, char * argv[])
  56 {
  57     player * first = new player( 1);
  58     player * p = first;
  59     for ( int i = 2; i <= 4; ++i)
  60     {
  61         p->nxt = new player( i);
  62         p = p->nxt;
  63     }
  64     p->nxt = first;
  65     first->run();
  66
  67     std::cout << "Done" << std::endl;
  68
  69     return EXIT_SUCCESS;
  70 }