对象池 c++11

#ifndef COBJECTPOOL_H
#define COBJECTPOOL_H
#include <functional>
#include <memory>
#include <map>
#include <string>
const int maxObjectNum = 10;
template<class T>
class ObjectPool {
template<class ...Args>
using Consturctor = std::function<std::shared_ptr<T>(Args...)>;
public:
template<class ... Args>
void init(size_t num, Args && ... args)
{
if (num <= 0 || num > maxObjectNum)
{
throw std::logic_error("obj num out of range");
}

auto constructName = typeid(Consturctor<Args...>).name();
for (size_t i = 0; i < num; i++)
{
m_obj_map.emplace(constructName, std::shared_ptr<T>(new T(std::forward<Args>(args)...), [this, constructName](T* p) {
m_obj_map.emplace(std::move(constructName), std::shared_ptr<T>(p));
}));
}
}

template<class ... Args>
std::shared_ptr<T> Get()
{
auto constructName = typeid(Consturctor<Args...>).name();
auto range = m_obj_map.equal_range(constructName);
for (auto it = range.first; it != range.second; ++it)
{
auto ptr = it->second;
m_obj_map.erase(it);
return ptr;
}
return nullptr;

}
private:
std::multimap<std::string, std::shared_ptr<T>> m_obj_map;
};
#endif//COBJECTPOOL_H

ObjectPool<int> pl;
pl.init(2);

auto t = pl.Get();
//t = 2;
*(t.get()) = 2;
std::cout << *(t.get()) << std::endl;