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When you need to allocate large blocks of memory, the system s implementation of malloc() will automatically be used. Although we will briefly discuss using g_malloc() and its related functions in the next section, you should use memory slices for memory allocation in new code as long as you do not plan on resizing objects after allocation. One constraint of memory slices is that the size of the object must be the same size when it was allocated and when it is freed. There are two ways to use slice allocators: to allocate a single object of any size greater than two pointers or to allocate multiple objects of the same size. The code in Listing 6-1 shows you how to allocate multiple objects; it allocates an array of one hundred objects with the slice allocator and then frees them. Listing 6-1. Allocating Multiple Objects #define SLICE_SIZE 10 gchar *strings[100]; gint i; for (i = 0; i < 100; i++) strings[i] = g_slice_alloc (SLICE_SIZE); /* ... Use the strings in some way ... */ /* Free all of the memory after you are done using it. */ for (i = 0; i < 100; i++) g_slice_free1 (SLICE_SIZE, strings[i]);

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ISingletonBuilder<> and SingletonBuilder represent the classes used to instantiate SingletonData The idea is that delegating the instantiation to SingletonBuilder, a local AppDomain singleton could in fact be a proxy to another singleton executing in another AppDomain or on a remote machine The SingletonBuilder is in complete control From an execution point of view, the way the versatile singleton considers SingletonData is as immutable The SingletonData class is updated using external means that the consumer of SingletonData doesn t know about Internally, Singleton<> implements a verification and update of the SingletonData mechanism Immutability and Threading The user is responsible for defining a builder that instantiates, verifies, and indicates how the internal Singleton<> update process executes.

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In Listing 6-1, g_slice_alloc() was used to allocate 100 strings of length SLICE_SIZE. Slice allocation is very simple all you need to do is supply the size of memory that the slice should be. Similar to malloc(), this function returns a gpointer to the memory instead of an object that is cast. Internally, GLib decides whether to use slab allocation or delegate the memory allocation to g_malloc(). Memory allocation is performed by g_malloc() when the desired memory slice is very large. GLib also provides g_slice_alloc0(), which will initialize the returned memory chunk to 0.

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Usually this will involve automatically creating a wrapper assembly that contains managed types that expose the COM interfaces to your managed code Visual Studio contains several tools that simplify this process, such as tlbimpexe, which creates a wrapper assembly from a typelib (TLB file) that is usually present with a COM library You can also go the other way, exposing managed objects to COM This process involves attributing the types with COM attributes, specifying, for example, the GUID for the type, and using tlbexpexe to generate a type library that can be used to instantiate the managed objects from COM as COM objects All of the previously mentioned interop methods are available to all CLR languages, but in C++/CLI, you have the option of an additional type of interop if you have the C++ source code and can recompile it with the /clr option.

Note Memory slices will choose the most efficient method of memory allocation for the current case during runtime, whether that is slab allocation, g_malloc(), or some other method. However, you can force it to always use g_malloc() by setting the G_SLICE environment variable to always-malloc.

Following is the definition for the ISingletonBuilder<> interface that the user is responsible for: public interface ISingletonBuilder< type> where type: class { DelegatePredicate< type> IsValid { get; } DelegateTransformer< object, type> NewObject { get ; } int SleepTime { get; } bool KeepPolling { get; } } The interface definition provides no method to directly instantiate the type SingletonData The approach chosen is to use functors to instantiate and verify the object Functors were chosen because they make it possible to combine operations and use the Chain of Responsibility pattern Then whenever a request is made for instantiation of a singleton data object, one transformer in the chain can perform the action The other properties relate to the execution of the Singleton<> update mechanism The other methods of the ISingletonBuilder<> interface relate to the topic of updating the data of the singleton A singleton is a performance bottleneck.