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- /* Copyright 2016-2017 Joaquin M Lopez Munoz.
- * Distributed under the Boost Software License, Version 1.0.
- * (See accompanying file LICENSE_1_0.txt or copy at
- * http://www.boost.org/LICENSE_1_0.txt)
- *
- * See http://www.boost.org/libs/poly_collection for library home page.
- */
- /* examples of insertion and emplacement */
- #include <algorithm>
- #include <array>
- #include <boost/poly_collection/base_collection.hpp>
- #include <random>
- #include "rolegame.hpp"
- int main()
- {
- boost::base_collection<sprite> c;
- // populate c
- std::mt19937 gen{92748}; // some arbitrary random seed
- std::discrete_distribution<> rnd{{1,1,1}};
- for(int i=0;i<8;++i){ // assign each type with 1/3 probability
- switch(rnd(gen)){
- case 0: c.insert(warrior{i});break;
- case 1: c.insert(juggernaut{i});break;
- case 2: c.insert(goblin{i});break;
- }
- }
- auto render=[](const boost::base_collection<sprite>& c){
- const char* comma="";
- for(const sprite& s:c){
- std::cout<<comma;
- s.render(std::cout);
- comma=",";
- }
- std::cout<<"\n";
- };
- render(c);
- //[insertion_emplacement_1]
- c.insert(c.begin(),juggernaut{8});
- //]
- render(c);
- //[insertion_emplacement_2]
- c.insert(c.begin(),goblin{9});
- //]
- render(c);
- //[insertion_emplacement_3]
- c.insert(c.begin<juggernaut>()+2,juggernaut{10});
- // ^^ remember local iterators are random access
- //]
- render(c);
- //[insertion_emplacement_4]
- //= c.insert(c.begin(typeid(warrior)),juggernaut{11}); // undefined behavior!!
- //]
- //[insertion_emplacement_5]
- boost::base_collection<sprite> c2;
- c2.insert(c.begin(),c.end()); // read below
- //<-
- render(c2);
- //->
- // add some more warriors
- std::array<warrior,3> aw={{11,12,13}};
- c2.insert(aw.begin(),aw.end());
- //<-
- render(c2);
- //->
- // add some goblins at the beginning of their segment
- std::array<goblin,3> ag={{14,15,16}};
- c2.insert(c2.begin<goblin>(),ag.begin(),ag.end());
- //<-
- render(c2);
- //->
- //]
- //[insertion_emplacement_6]
- //<-
- // same as line at beginning of previous snippet
- //->
- c2.insert(c.begin(),c.end());
- //]
- //[insertion_emplacement_7]
- //= c.emplace(11); // does not compile
- //]
- //[insertion_emplacement_8]
- c.emplace<goblin>(11); // now it works
- //]
- render(c);
- //[insertion_emplacement_9]
- c.emplace_hint<juggernaut>(c.begin(),12); // at the beginning if possible
- c.emplace_pos<goblin>(c.begin<goblin>()+2,13); // amidst the goblins
- c.emplace_pos<warrior>(c.begin(typeid(warrior)),14); // local_base_iterator
- //]
- render(c);
- }
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