Question

Sorry. a trivial question on reference map access

if I have:

map<int,string> *items= new map<int,string>();

I do this?

string x = &items[100];

Answer 1

So, first I ask; why are you dynamically allocating your map? It kind of defeats the purpose of using it in the first place. The map will internally use dynamic allocation for it’s items, but the map itself is cheap and you lose the ability to deterministically manage its memory via scope. So, your code becomes:

map<int,string> my_map;
my_map[100] = "some string";
string x = items[100];

Otherwise you need to dereference the map pointer first.

string x = (*my_map)[100];

Really though… don’t do that.