Interning

A variation of the Singleton is Intern. Assume a class of

class Symbol
{
private:
�� string name;
�� Symbol()
��
�� // etc.
};

class Intern
{
private:
�� map<string, Symbol> symbols;
public:
�� Symbol makeSymbol(string name)
�� {
����� map<string, Symbol>::iterator p;
����� p = symbols.find(name);
�����