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When creating a map, the type used as key must have the operators == and < defined because the map must be able to compare keys and order them QMap delivers good lookup performance because it always keeps the keys sorted This is evident when executing Listing 1-20, in which the results are returned in bar-baz-foo order, not as they were inserted If this is not important to your application, you can gain even more performance by using a QHash instead The QHash class can be used in the same way as QMap, but the order of the keys is arbitrary The type used for keys in a hash must have the == operator and a global function called qHash The qHash function should return an unsigned integer called a hash key that is used for looking up items in the hash list.

With the knowledge you ve already gained, you will be able to create most of the routes you are likely to need, but there is one problem. Every route matched must result in at least the routing variables controller and action being assigned a value, but URLs such as / don t contain enough characters to be able to deduce the controller and action names from them. To solve this problem, Routes allows you to specify default values for any routing variables as part of the routing map s connect() function. You ve already seen default variables in action during the discussion of Pylons error route, but let s look at another example: >>> map = Mapper(controller_scan=controller_scan) >>> map.minimization = False >>> map.connect('/archives/by_eon/{century}', controller='page', action='list') In this example, the controller and action both have default values, so they are called default variables. You ll notice that you can t create a URL that will affect the value of the controller and action variables since they aren t present in the route path, so their default values of archives' and 'list' will always be used. Such variables are known as hard-coded variables. The value assigned to the century routing variable will depend on the URL with which it is matched:

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The only requirement for the function is that it should always return the same value for the same data Qt provides such functions for the most common types, but you must provide such a function if you want to put your own classes in a hash list The performance of the hash list depends on the number of collisions that it can expect; that is, the number of keys that yields the same hash key By using your knowledge of the keys that might appear, you can use the hash function to increase performance For example, in a phone book application, persons might have the same name, but usually do not share a name and a phone number Listing 1-22 shows the class Person that holds a person with name and number Listing 1-22.

Debar, Herve, Marc Dacier, and Andreas Wespi 1999 Towards a taxonomy of intrusiondetection systems Computer Networks 31 (8): 805 822 Denning, Dorothy E 1986 An intrusion-detection model In Proceedings of the 1986 IEEE Computer Society Symposium on Research in Security and Privacy, 118 131 1995 Critical factors of key escrow encryption systems In Proceedings of the 18th National Information Systems Security Conference, 384 394 Denning, Dorothy E, and Dennis K Branstad 1996 A taxonomy for key escrow encryption systems Communications of the ACM 39 (3): 34 40 Dennis, Sylvia, and Steve Gold 1999 White House web site hacked by anti NATO hactivists Newsbytes, March 30 wwwfindarticlescom/p/articles/mi_m0HDN/is_1999_March_30/ ai_54275915 Dierks, Tim, and Eric Rescorla 2006 The Transport Layer Security (TLS) Protocol, version 11 RFC 4346, April wwwietforg/rfc/rfc4346txt..

>>> print map.match('/archives/by_eon/') None >>> print map.match('/archives/by_eon') None >>> print map.match('/archives/by_eon/1800') {'action': u'aggregate', 'controller': u'page', 'century': u'1800'}

A class holding name and number class Person { public: Person( const QString& name, const QString& number ); const QString& name() const; const QString& number() const; private: QString m_name, m_number; }; For this class, you must provide a == operator and a qHash function (shown in Listing 1-23) The == operator ensures that both the name and number match The qHash function takes the hashes for the name and number from the qHash(QString) function and joins them using the XOR logical operator (^) Listing 1-23 Hash functions for the Person class bool operator==( const Person &a, const Person &b ) { return (aname() == bname()) && (anumber() == bnumber()); } uint qHash( const Person &key ) { return qHash( keyname() ) ^ qHash( keynumber() ); }.

map.connect() method also accepts certain keyword arguments including requirement, _explicit, _encoding, and _filter. If you choose a routing variable with the same name as one of these arguments, then

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