Type erasure, C++ (gcc)

Language: Layout:

//Title of this code
//g++  4.8.2

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

class Thing
{
private:
    struct Object
    {
        virtual void print(std::ostream&) const = 0;
    };
    
    template<class T>
    struct ObjectModel : Object
    {
        ObjectModel(const T& obj) : obj_(obj)
        {
            
        };
        
        void print(std::ostream& out) const
        {
            out << obj_;
        }
        
        T obj_;
    };
    
    std::shared_ptr<Object> objPtr;
public:
    
    explicit Thing(const char* str) : objPtr(new ObjectModel<std::string>(str))
    {
    }
    
    template<class T>
    explicit Thing(const T& obj) : objPtr(new ObjectModel<T>(obj))
    {
        
    }
    
    void print(std::ostream& out) const
    {
        objPtr->print(out);
    }
};

std::ostream& operator << (std::ostream& out, const Thing& thing)
{
    thing.print(out);
    
    return out;
}

class Person
{
private:
    std::string firstName_;
    std::string familyName_;
    
public:
    Person(const std::string& firstName, const std::string& familyName) : firstName_(firstName), familyName_(familyName)
    {
        
    }
    
    std::string getFirstName() const { return firstName_; }
    std::string getFamilyName() const { return familyName_; }
    
    void print(std::ostream& out) const
    {
        out << "[First Name: " << getFirstName() << ", Family name: " << getFamilyName() << "]";
    }
};

std::ostream& operator << (std::ostream& out, const Person& person)
{
    person.print(out);
    
    return out;
}

int main()
{
    std::vector<Thing> things;
        
    things.push_back(Thing(1));
    things.push_back(Thing(std::string("hello")));
    things.push_back(Thing(5.5));
    things.push_back(Thing(Person("Ovidiu", "Moscaliuc")));
    things.push_back(Thing("nice"));
    
    for(unsigned int i = 0; i < things.size(); ++ i)
    {
        std::cout << things[i] << " ";
    }
}

Show compiler warnings [ + ] Compiler args [ + ] Show input
Compilation time: 0.82 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.97 sec