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#include <iostream>
#include <string>
#include <memory>
#include <unordered_map>
using namespace std;
 
// Manager declaration
class instance;
 
class manager {
public:
	instance &get_instance(string name);
	void print(string sender, string message);
 
private:
	unordered_map<string, unique_ptr<instance>> m_instances;
};
 
// Instance declaration
class instance : public manager {
public:
	instance(string name, manager &manager);
	void print(string message);
 
private:
	string m_name;
	manager &m_manager;
};
 
// Manager implementation
instance &manager::get_instance(string name) {
	if (m_instances.find(name) == m_instances.end())
		m_instances[name] = make_unique<instance>(name, *this);
	return *m_instances[name].get();
}
 
void manager::print(string sender, string message) {
	cout << sender << ": " << message << endl;
}
 
// Instance implementation
instance::instance(string name, manager &manager) : m_name(name), m_manager(manager) {}
 
void instance::print(string message) {
	manager::print(m_name, message);
}
 
int main() {
	manager m;
	m.get_instance("Foo").print("Bar.");
	return 0;
}
 

In file included from /usr/include/c++/4.8/unordered_map:35:0,
                 from prog.cpp:4:
/usr/include/c++/4.8/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support for the \
  ^
prog.cpp:16:2: error: ‘unordered_map’ does not name a type
  unordered_map<string, unique_ptr<instance>> m_instances;
  ^
prog.cpp: In member function ‘instance& manager::get_instance(std::string)’:
prog.cpp:32:6: error: ‘m_instances’ was not declared in this scope
  if (m_instances.find(name) == m_instances.end())
      ^
prog.cpp:33:23: error: ‘make_unique’ was not declared in this scope
   m_instances[name] = make_unique<instance>(name, *this);
                       ^
prog.cpp:33:43: error: expected primary-expression before ‘>’ token
   m_instances[name] = make_unique<instance>(name, *this);
                                           ^
prog.cpp:33:52: warning: left operand of comma operator has no effect [-Wunused-value]
   m_instances[name] = make_unique<instance>(name, *this);
                                                    ^
prog.cpp:34:10: error: ‘m_instances’ was not declared in this scope
  return *m_instances[name].get();
          ^
prog.cpp:35:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty