intrusive list shenanigans.cpp

#include <iostream>
#include <vector>
#include <boost/intrusive/list.hpp>
using namespace std;

class entity_c : public boost::intrusive::list_base_hook<> {
public:

	const int isconst;
	int notconst;

	entity_c(int con, int notcon)
		: isconst(con), notconst(notcon) {
		cout << "constructed entity (" << isconst << ',' << notconst << ")\n";
	}

	~entity_c() {
		cout << "destructed entity (" << isconst << ',' << notconst << ")\n";
	}

};

typedef boost::intrusive::list<entity_c> list_t;
namespace {list_t global_list;}

//Cloner object function
struct new_cloner {
   entity_c *operator()(const entity_c &clone_this)
   {  return new entity_c(clone_this);  }
};

//The disposer object function
struct delete_disposer {
   void operator()(entity_c *delete_this)
   {  delete delete_this;  }
};

int main() {

	int max = 5;

	static vector<entity_c> values;
	values.reserve(max);

	int i = 1;
	while(i != max) {
		values.push_back(entity_c(i,i));
		cout << "MADE " << values.back().isconst << "\n\n";
		i++;
	}

	cout << "ALL CONSTRUCTED\n\n\n";

	static list_t list;

	cout << "INSERT INTO BASE HOOK LIST\n";
	list.insert(list.begin(), values.begin(), values.end());

	global_list.clone_from(list, new_cloner(), delete_disposer());

	cout << global_list.back().isconst;	//check that the back of the global list is the same back as the local list

	cout << list.back().isconst << endl;

	return 0;
}