Question

I want to make a data structure for accessing strings by two ways:

1. Access by ID
2. Access by name

My first idea is using two maps for each method but it leads to duplication of data:

QMap<int, QString> accessById;
QMap<QString, QString> accessByName;

I’m searching for a better way, something like this:

QMap<QPair<int, QString>, QString> multiAccess;

but it can not help me (at least I don’t know how to do it), because searching in a map needs to know ID and name together. How can I define a well structure of Qt classes to achive my goal?

No external libraries, but Qt

Answer 1

How about:

QMap<QString, int> nameIdMap;
QMap<int, QString> accessById;

You access by id and create a map for names and ids. Then you can access by name with

QString data = accessById[nameIdMap[the_name]];