Using std::unique_ptr inside a map as a key

Question

I am using Visual Studio 2012. I have a map that looks like this:

std::map,std::unique_ptr

        

Answer 1

Look at the template definition for std::map:

template<
    class Key,
    class T,
    class Compare = std::less,
    class Allocator = std::allocator >
> class map;

And now lets look at how you try to instantiate it:

std::map<
    std::string, 
    std::map<
        std::unique_ptr, 
        std::unique_ptr
    >
> 
listSoundContainer

The problem here is that a std::unique_ptr cannot act as a key.

What you seem trying to do is to make some kind of list of std::pair, std::unique_ptr>

I would suggest using this instead:

std::map<
    std::string, 
    std::list<
        std::pair<
            std::unique_ptr, 
            std::unique_ptr
        >
    >
> 
listSoundContainer