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ref class R {}; class N { R^ r; public: N() { r = gcnew R(); } }; There is a way to properly contain a handle in a native type, and that is to use the gcroot template, with the handle to the reference type as an argument. In 6, you saw how this was done with the gcroot and the auto_gcroot templates. Listing 13-22 illustrates the difference between the gcroot template and the auto_gcroot template. Listing 13-22. gcroot vs. auto_gcroot // auto_gcroot.cpp #include <msclr/gcroot.h> #include <msclr/auto_gcroot.h> using namespace System; using namespace msclr; ref class R { public: void f() { Console::WriteLine("managed member function"); }

A hash table is a data type that is optimized so that its elements can be found very quickly. Data is stored as a number of key-value pairs. Neither the key nor the value is actually stored by GHashTable in GLib, so the pair must exist for the lifetime of the hash table itself. That means you should not use temporary strings such as those returned from GTK+ widgets. If you need to use a temporary string, you should call g_strdup() to make a permanent copy of the string. Hash tables are useful when you are storing a large number of elements, because they provide constant lookup time on average. This average is independent of the number of elements. The lookup time can be longer in some cases, but that is rare. New hash tables are created in GLib with g_hash_table_new(), which accepts two functions. The hash function is used to create a new hash value out of a key, which can be NULL. The second function is used to check whether two keys are equal to each other. GHashTable* g_hash_table_new (GHashFunc hash_func, GEqualFunc key_equal_func); Hash functions are defined by the function prototype for GHashFunc, shown previously. It accepts the key value and returns the corresponding hash value. You are free to write your own hash functions, but GLib already provides three for commonly used values. These are g_direct_hash(), g_int_hash(), and g_str_hash(), which can be used when the key is a gpointer, gint, and a string respectively. guint (*GHashFunc) (gconstpointer key);

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The method RunningTotalMethod is the delegate for RunningTotalBroadcast and receives updates of the running total. The IList<> interface isn t exposed to the client. This is a controversial detail because it requires including add and remove collection methods to TicketsFacade. Alternatively, a Fa ade implementation could have exposed the IList<> interface, as it s a general interface and isn t required as a handle to any other Fa ade type method. This means any interface instance or base class reference returns to the client, and the owner of the returned data is and remains the Fa ade implementation. The RunningTotal property is exposed and is callable by the client to determine what the current running total is. If the Fa ade implementation exposes a property that represents a state, then the Fa ade implementation must be the manager and owner of the state. The management of the state can t be delegated to the client. What is important to remember when implementing the Fa ade pattern is that the Fa ade implementation is the owner and manager of state, references, and anything else. The client only sees an easy-to-use class with methods and properties that makes it simpler for it to realize the solution to the problem.

The key comparison function is defined by the following GEqualFunc prototype These functions should return TRUE if a and b are equal and FALSE if they are not GLib already provides three functions: g_direct_equal(), g_int_equal(), and g_str_equal(), which act as comparison functions for gpointer, gint, and string type keys gboolean (*GEqualFunc) (gconstpointer a, gconstpointer b); In addition to g_hash_table_new(), GLib provides g_hash_table_new_full(), which allows you to supply destroy callback functions for keys and values when they are removed from the hash table There are two ways to insert a new key-value pair into a hash table The first is by calling g_hash_table_insert() If the key already exists within the table, value will replace its current value You can also call g_hash_table_replace(), which provides the same functionality However, if the key already exists within the table, both the key and value objects will be replaced.

~R() { Console::WriteLine("destructor"); } }; class N { gcroot<R^> r_gcroot; auto_gcroot<R^> r_auto_gcroot;

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