About a stange issue with a map variable inside a const function

[tonnot]

I have a map<int<map<int,char> > variable.
It is declared at the private section of my .h file :

map<unsigned int,std::map<unsigned int,char> > map__type;
I also have :
vector<string> vecHheader;

I use it in this function with sufix const keyword
myfunction (bla bla) const

Ok I can return vector information but not map ???
( I have the const error : ... bla bla bla dicard qualifiers.)

Whats happen ? I can not use map into a const functions ? I want only to returning information !

Any idea ? Thanks .


And , If I made mymap mutable... What can I expect from mymap or const function perfomance ?