Friday, November 15, 2002


Lang note: the ability to do a "recognize as" from atomic items to some structure with a minimum of fuss (and certainly without having to perform an explicit construction step) is essential to using structured design everywhere it will be useful.

For example: if a certain piece of functionality is best expressed as the function:

bool isAuth(int requestorType, string requestorName, int resourceType, int resourceName, int permLevel);

...but elsewhere there are the fully articulated structures (or objects!):


struct Requestor { int type; string name; ... };
struct Resource { int type; string name; ... };
struct Permission { int level; ... };
struct Request { Requestor req; Resource res; Permission perms; };

...then it absolutely pays to be able to go back and forth transparently, both in the code and at runtime. E.g.?

 


11:14:48 AM