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GLib provides a number of functions that wrap functionality provided by the standard C library. A description of a few of these functions is presented in this section.

I ll discuss cross-language interop, P/Invoke, and COM interop in brief Using native types and managed types together in the same assembly, for example, in order to create a managed wrapper for a native class library, is the main focus of this chapter You ll learn how to reference a native type in a managed type, and how to reference a managed type in a native type You ll see pointer types that help in working with interoperability scenarios, such as interior pointers and pinning pointers You ll also look into converting types between native and managed equivalents This type of conversion is usually called marshaling Visual C++ 2008 introduces the marshaling library, which simplifies these types of conversions considerably Interop is an intriguing, complex subject.

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Note It is important to note that you do not need to verify that any of the following calls were successful. If any call to allocate memory fails, the application will automatically be terminated by Glib, and a message will be printed to standard error, displaying the error that has occurred.

A full discussion of all the subtle aspects of interop would be impossible in an introductory text, so this chapter will focus on some basic scenarios.

_instance_lockAcquireReaderLock( -1); if( _instance_data == null) { _instance_lockUpgradeToWriterLock(-1); if( _instance_data == null) { _instance_data = _instance_builderNewObject( obj); } } retval = _instance_data; } finally { _instance_lockReleaseLock(); } return retval; } } The Singleton<> class is a Generic class that has two generic parameters: singletonupdate and type The type is an implementation of the ISingletonBuilder<> interface It s specified as a template parameter because of the nature of the singleton Unfortunately, the singleton is a static type that is instantiated without knowing any reference information Using a singleton within the singleton is a futile endeavor, as that would create a recursion, and attempting to reference a configuration file creates an unwanted dependency The only solution is to define the type as a generic parameter.

To allocate one or more new structures, you should use g_new(). This function receives the type of data and the number of structures to allocate. It then returns a pointer to the new memory. struct_type* g_new (struct_type, number_of_structs); The returned data is already cast to the correct type, so there is no need to recast the object. If you want all of the structures to be initialized to 0 by default, you should use g_new0() instead. A method most C programmers are familiar with is malloc(). GLib provides a portable wrapped version of this function called g_malloc(). This function receives the number of bytes to allocate and returns a pointer to the allocated memory. gpointer g_malloc (gulong number_of_bytes); The easiest way to calculate the number of bytes of memory to allocate is to use the sizeof() function on the data type. The returned object is not automatically cast, so you will want to immediately take care of casting in most cases. The g_malloc0() function is also provided if you want the newly allocated memory to be initialized with a value of 0.

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