| 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 | /* examples of insertion and emplacement */ |
| 10 | |
| 11 | #include <algorithm> |
| 12 | #include <array> |
| 13 | #include <boost/poly_collection/base_collection.hpp> |
| 14 | #include <random> |
| 15 | #include "rolegame.hpp" |
| 16 | |
| 17 | int main() |
| 18 | { |
| 19 | boost::base_collection<sprite> c; |
| 20 | |
| 21 | // populate c |
| 22 | |
| 23 | std::mt19937 gen{92748}; // some arbitrary random seed |
| 24 | std::discrete_distribution<> rnd{{1,1,1}}; |
| 25 | for(int i=0;i<8;++i){ // assign each type with 1/3 probability |
| 26 | switch(rnd(gen)){ |
| 27 | case 0: c.insert(x: warrior{i});break; |
| 28 | case 1: c.insert(x: juggernaut{i});break; |
| 29 | case 2: c.insert(x: goblin{i});break; |
| 30 | } |
| 31 | } |
| 32 | |
| 33 | auto render=[](const boost::base_collection<sprite>& c){ |
| 34 | const char* comma="" ; |
| 35 | for(const sprite& s:c){ |
| 36 | std::cout<<comma; |
| 37 | s.render(os&: std::cout); |
| 38 | comma="," ; |
| 39 | } |
| 40 | std::cout<<"\n" ; |
| 41 | }; |
| 42 | render(c); |
| 43 | |
| 44 | //[insertion_emplacement_1] |
| 45 | c.insert(hint: c.begin(),x: juggernaut{8}); |
| 46 | //] |
| 47 | render(c); |
| 48 | |
| 49 | //[insertion_emplacement_2] |
| 50 | c.insert(hint: c.begin(),x: goblin{9}); |
| 51 | //] |
| 52 | render(c); |
| 53 | |
| 54 | //[insertion_emplacement_3] |
| 55 | c.insert(pos: c.begin<juggernaut>()+2,x: juggernaut{10}); |
| 56 | // ^^ remember local iterators are random access |
| 57 | //] |
| 58 | render(c); |
| 59 | |
| 60 | //[insertion_emplacement_4] |
| 61 | //= c.insert(c.begin(typeid(warrior)),juggernaut{11}); // undefined behavior!! |
| 62 | //] |
| 63 | |
| 64 | //[insertion_emplacement_5] |
| 65 | boost::base_collection<sprite> c2; |
| 66 | |
| 67 | c2.insert(first: c.begin(),last: c.end()); // read below |
| 68 | //<- |
| 69 | render(c2); |
| 70 | //-> |
| 71 | |
| 72 | // add some more warriors |
| 73 | std::array<warrior,3> aw={._M_elems: {11,12,13}}; |
| 74 | c2.insert(first: aw.begin(),last: aw.end()); |
| 75 | //<- |
| 76 | render(c2); |
| 77 | //-> |
| 78 | |
| 79 | // add some goblins at the beginning of their segment |
| 80 | std::array<goblin,3> ag={._M_elems: {14,15,16}}; |
| 81 | c2.insert(pos: c2.begin<goblin>(),first: ag.begin(),last: ag.end()); |
| 82 | //<- |
| 83 | render(c2); |
| 84 | //-> |
| 85 | //] |
| 86 | |
| 87 | //[insertion_emplacement_6] |
| 88 | //<- |
| 89 | // same as line at beginning of previous snippet |
| 90 | //-> |
| 91 | c2.insert(first: c.begin(),last: c.end()); |
| 92 | //] |
| 93 | |
| 94 | //[insertion_emplacement_7] |
| 95 | //= c.emplace(11); // does not compile |
| 96 | //] |
| 97 | |
| 98 | //[insertion_emplacement_8] |
| 99 | c.emplace<goblin>(args: 11); // now it works |
| 100 | //] |
| 101 | render(c); |
| 102 | |
| 103 | //[insertion_emplacement_9] |
| 104 | c.emplace_hint<juggernaut>(hint: c.begin(),args: 12); // at the beginning if possible |
| 105 | c.emplace_pos<goblin>(pos: c.begin<goblin>()+2,args: 13); // amidst the goblins |
| 106 | c.emplace_pos<warrior>(pos: c.begin(info: typeid(warrior)),args: 14); // local_base_iterator |
| 107 | //] |
| 108 | render(c); |
| 109 | } |
| 110 | |