#include <iostream>
#include <vector>

class Inventory_Space
{
public:
    Inventory_Space(int* obj = nullptr);
    ~Inventory_Space();

    Inventory_Space(Inventory_Space const& rhs);
    Inventory_Space(Inventory_Space && rhs);

    Inventory_Space& operator=(Inventory_Space const& rhs) = delete;
    Inventory_Space& operator=(Inventory_Space && rhs) = delete;

    Inventory_Space& merge(Inventory_Space& rhs);
    void print() const;
  
private:
    int* content;
};

Inventory_Space::Inventory_Space(int* obj)
    : content{obj}
{
}

Inventory_Space::~Inventory_Space()
{
    delete content;
}

Inventory_Space::Inventory_Space(Inventory_Space const& rhs)
    : content{new int {*(rhs.content)}}
{
}

Inventory_Space::Inventory_Space(Inventory_Space && rhs)
    : content{rhs.content}
{
    rhs.content = nullptr;
}

Inventory_Space& Inventory_Space::merge(Inventory_Space& rhs)
{
    if ( this == &rhs )
    {
        return *this;
    }
  
    if ( content == nullptr )
    {
        std::swap(content, rhs.content);
    }
    else if ( rhs.content != nullptr )
    {
        if ( *content == *rhs.content )
        {
            ++*content;
            delete rhs.content;
            rhs.content = nullptr;
        }
    }
    return *this;
}

void Inventory_Space::print()
{
    if ( content != nullptr )
    {
        std::cout << *content;
    }
    else
    {
        std::cout << '-';
    }
}

int main()
{
    std::vector<Inventory_Space> v {};

    // Create 8 spaces
    for ( unsigned int i{}; i < 8; ++i )
    {
        v.push_back(Inventory_Space{new int{1}});
    }

    for ( unsigned int i{0}; i < v.size(); ++i )
    {
        // Merge each space with the next. Empty spaces will "bubble" to
        // the end as each iteration drop the next space into it.
        for ( unsigned int j{1}; j < v.size(); ++j )
        {
            v.at(j-1).merge( v.at(j) );
        }

        // Print all spaces after each iteration (one line of output)
        for ( unsigned int k{0}; k < v.size(); ++k )
        {
            v.at(k).print();
        }
        std::cout << std::endl;
    }
  
    return 0;
}