104 lines
2.6 KiB
C++
104 lines
2.6 KiB
C++
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/* Copyright 2016-2017 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org/libs/poly_collection for library home page.
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*/
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/* basic usage of boost::function_collection */
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#include <boost/poly_collection/function_collection.hpp>
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#include <functional>
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#include <memory>
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#include <random>
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#include <vector>
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#include "rolegame.hpp"
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int main()
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{
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//[basic_function_1
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std::vector<std::unique_ptr<sprite>> sprs;
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std::vector<std::string> msgs;
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std::vector<window> wnds;
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//]
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// populate sprs
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std::mt19937 gen{92748}; // some arbitrary random seed
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std::discrete_distribution<> rnd{{1,1,1}};
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for(int i=0;i<4;++i){ // assign each type with 1/3 probability
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switch(rnd(gen)){
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case 0: sprs.push_back(std::make_unique<warrior>(i));;break;
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case 1: sprs.push_back(std::make_unique<juggernaut>(i));break;
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case 2: sprs.push_back(std::make_unique<goblin>(i));break;
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}
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}
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// populate msgs
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msgs.push_back("\"stamina: 10,000\"");
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msgs.push_back("\"game over\"");
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// populate wnds
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wnds.emplace_back("pop-up 1");
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wnds.emplace_back("pop-up 2");
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//[basic_function_2
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//= #include <boost/poly_collection/function_collection.hpp>
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//= ...
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//=
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// function signature accepting std::ostream& and returning nothing
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using render_callback=void(std::ostream&);
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boost::function_collection<render_callback> c;
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//]
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//[basic_function_3
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//<-
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auto render_sprite=[](const sprite& s){
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//->
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//= auto render_sprite(const sprite& s){
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return [&](std::ostream& os){s.render(os);};
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}/*<-*/;/*->*/
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//<-
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auto render_message=[](const std::string& m){
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//->
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//= auto render_message(const std::string& m){
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return [&](std::ostream& os){os<<m;};
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}/*<-*/;/*->*/
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//<-
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auto render_window=[](const window& w){
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//->
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//= auto render_window(const window& w){
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return [&](std::ostream& os){w.display(os);};
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}/*<-*/;/*->*/
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//= ...
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//=
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for(const auto& ps:sprs)c.insert(render_sprite(*ps));
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for(const auto& m:msgs)c.insert(render_message(m));
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for(const auto& w:wnds)c.insert(render_window(w));
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//]
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//[basic_function_4
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const char* comma="";
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for(const auto& cbk:c){
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std::cout<<comma;
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cbk(std::cout);
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comma=",";
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}
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std::cout<<"\n";
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//]
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//[basic_function_5
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auto cbk=*c.begin();
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cbk(std::cout); // renders first element to std::cout
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std::function<render_callback> f=cbk;
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f(std::cout); // exactly the same
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//]
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//[basic_function_6
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//= *c.begin()=render_message("last minute message"); // compile-time error
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//]
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}
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