libs/poly_collection/example/basic_any.cpp
/* 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.
*/
/* basic usage of boost::any_collection */
#include <boost/poly_collection/any_collection.hpp>
#include <boost/type_erasure/operators.hpp>
#include <random>
#include "rolegame.hpp"
//[basic_any_1
std::ostream& operator<<(std::ostream& os,const sprite& s)
{
s.render(os);
return os;
}
// std::string already has a suitable operator<<
std::ostream& operator<<(std::ostream& os,const window& w)
{
w.display(os);
return os;
}
//]
int main()
{
//[basic_any_2
//= #include <boost/poly_collection/any_collection.hpp>
//= #include <boost/type_erasure/operators.hpp>
//= ...
//=
using renderable=boost::type_erasure::ostreamable<>;
boost::any_collection<renderable> c;
//]
//[basic_any_3
// populate with sprites
std::mt19937 gen{92748}; // some arbitrary random seed
std::discrete_distribution<> rnd{{1,1,1}};
for(int i=0;i<4;++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;
}
}
// populate with messages
c.insert(std::string{"\"stamina: 10,000\""});
c.insert(std::string{"\"game over\""});
// populate with windows
c.insert(window{"pop-up 1"});
c.insert(window{"pop-up 2"});
//]
//[basic_any_4
const char* comma="";
for(const auto& r:c){
std::cout<<comma<<r;
comma=",";
}
std::cout<<"\n";
//]
}