poly_collection/example/exceptions.cpp
joaquintides 00848ec1c8 stylistic
2017-11-04 13:08:36 +01:00

63 lines
1.6 KiB
C++

/* 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.
*/
/* Boost.PolyCollection exceptions */
#include <algorithm>
#include <array>
#include <boost/poly_collection/base_collection.hpp>
#include <random>
#include "rolegame.hpp"
int main()
{
boost::base_collection<sprite> c,c2;
// 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);
try{
//[exceptions_1
c.insert(elf{0}); // no problem
//= ...
//=
c2=c; // throws boost::poly_collection::not_copy_constructible
//]
}catch(boost::poly_collection::not_copy_constructible&){}
try{
//[exceptions_2
c.clear<elf>(); // get rid of non-copyable elfs
c2=c; // now it works
// check that the two are indeed equal
std::cout<<(c==c2)<<"\n";
// throws boost::poly_collection::not_equality_comparable
//]
}catch(boost::poly_collection::not_equality_comparable&){}
}