ceph/src/boost/libs/poly_collection/example/basic_base.cpp

   1 /* Copyright 2016-2017 Joaquin M Lopez Munoz.
   2  * Distributed under the Boost Software License, Version 1.0.
   3  * (See accompanying file LICENSE_1_0.txt or copy at
   4  * http://www.boost.org/LICENSE_1_0.txt)
   5  *
   6  * See http://www.boost.org/libs/poly_collection for library home page.
   7  */
   8
   9 /* basic usage of boost::base_collection */
  10
  11 #include <algorithm>
  12 #include <boost/poly_collection/base_collection.hpp>
  13 #include <random>
  14 #include "rolegame.hpp"
  15
  16 int main()
  17 {
  18 //[basic_base_1
  19 //=  #include <boost/poly_collection/base_collection.hpp>
  20 //=  ...
  21 //=
  22   boost::base_collection<sprite> c;
  23
  24   std::mt19937                 gen{92748}; // some arbitrary random seed
  25   std::discrete_distribution<> rnd{{1,1,1}};
  26   for(int i=0;i<8;++i){        // assign each type with 1/3 probability
  27     switch(rnd(gen)){
  28       case 0: c.insert(warrior{i});break;
  29       case 1: c.insert(juggernaut{i});break;
  30       case 2: c.insert(goblin{i});break;
  31     }
  32   }
  33 //]
  34
  35   auto render=[&](){
  36 //[basic_base_2
  37     const char* comma="";
  38     for(const sprite& s:c){
  39       std::cout<<comma;
  40       s.render(std::cout);
  41       comma=",";
  42     }
  43     std::cout<<"\n";
  44 //]
  45   };
  46   render();
  47
  48 //[basic_base_3
  49   c.insert(goblin{8});
  50 //]
  51   render();
  52
  53 //[basic_base_4
  54   // find element with id==7 and remove it
  55   auto it=std::find_if(c.begin(),c.end(),[](const sprite& s){return s.id==7;});
  56   c.erase(it);
  57 //]
  58   render();
  59 }