Memory pool shared ptr

reusablememory.cpp

#include <memory>
#include <vector>
#include <iostream>
#include <list>

template <class T>
class VectorPool
{
public:
	~VectorPool()
	{
		std::cout << "free pool left " << freepool_.size() << std::endl;
		for(auto & p: freepool_)
			delete p;
	}

	std::shared_ptr<std::vector<T> > get(int k)
	{
		for(auto pi = freepool_.begin(); pi != freepool_.end(); ++pi)
		{
			if((*pi)->capacity() >= k)
			{
				auto r = std::shared_ptr<std::vector<T> >(*pi, [this] (std::vector<T>* p) { 
					// LOCK NEEDED
					std::cout << "putting back " << p << " " << p->size() << std::endl;
					this->freepool_.push_back(p); 
				}); 
				freepool_.erase(pi);
				return r;
			}
		}
		auto pp = new std::vector<T>(k);
		std::cout << "allocated " << pp << " k " << k << std::endl;
		return std::shared_ptr<std::vector<T> >(pp, [this] (std::vector<T>* p) { 
			// LOCK NEEDED
			std::cout << "putting back " << p << " " << p->size() << std::endl;
			this->freepool_.push_back(p); 
		});
	}

	std::list<std::vector<uint8_t> *> freepool_;
};



int main(int argc, char const *argv[])
{
	VectorPool<uint8_t> mypool;

	{
		auto p1 = mypool.get(10);
		auto p2 = mypool.get(20);
	}
	{
		auto p3 = mypool.get(20);
	}
	std::cout << "before freeing vector pool\n";

	return 0;
}