Cant insert to std::map (G++)

Question

I have a following trouble:

struct ServerPP {
    std::string name;
    int id;
    int expires;
};
std::map> Rem         


        

Answer 1

You have to define operator < for your ServerPP data structure if you want to be able to use it in std::set. For instance:

bool operator < (ServerPP const& lhs, ServerPP const& rhs)
{
    return (lhs.id < rhs.id);
}

Alternatively, you can define your own comparator and provide its type as the second template argument to std::set:

struct serv_comp
{
    bool operator () (ServerPP const& lhs, ServerPP const& rhs)
    {
        return (lhs.id < rhs.id);
    }
};

std::map<std::string, std::set<ServerPP, serv_comp>> RemindTable;

Here is a live example showing the code compiling.