C++:Creating a class for containing different types -

i new c++ actually, came python c++ reason. want create symbol_table compiler having 3 different methods.
let's consider type xxx

the code this:

class symbol_table {      public:           //store  integer  symbol table , return address of type xxx           xxx add_int(int  );           //store string  symbol table , return address of type xxx           xxx add_string(char );            xxx lookup(int x)           {              //if x exist in table return location           }           xxx lookup(char x)           {              //if x exist in table return location            }  }; 

what want returning address of type xxx same in both methods.

edit

so lookup this

symbol_table table ; xxx location1,location2; location1 = table.add_int(1); location2 = table.add_string("object");  table.lookup(1); //should return location1  table.lookup("object"); //should return location2 

this can addressed packing data types stored c union structure. or can use fancy boost::variant.

typedef boost::variant<int, std::string> value_type_t; std::vector<value_type_t> symbol_table; value_type_t v1(100);  symbol_table.push_back(v1); value_type_t v2("this string"); symbol_table.push_back(v2);