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There are several kinds of interop that you should be aware of. Cross-language interop is the one you ll see first, and that refers to the ability of C++/CLI to work closely with C# and Visual Basic, and other languages that target the CLR. Because of the common platform, common IL, and common assembly and metadata formats, you can use a C# or Visual Basic assembly pretty much as you would another C++/CLI assembly. You can reference it with #using, and you can create instances of the types declared in those assemblies, call methods, and so on. You can also go a step further and create inheritance hierarchies that cross language boundaries, such as a C# class that implements a C++/CLI interface, or a C++/CLI class that inherits from a class written in Visual Basic. Once these types are compiled to MSIL, there is little that indicates the original language in which they were authored. In addition to cross-language interop, you may also need to interoperate with native C++ code. The way you choose to interoperate depends on whether you have source code available or only have a binary, whether the native API is exposed as a function or a class, whether the API is exposed via COM, and whether you can recompile the code. Let s first consider the case where you don t have source access, and you simply have a library function in a native DLL that you d like to call from a managed environment. The CLR provides a mechanism for doing this; it s usually referred to as Platform Invoke, or P/Invoke,

Figure 7-4. UML diagram for a versatile singleton implementation As you see in Figure 7-4, the client interacts with two classes, Singleton<> and SingletonData. Singleton<> is a general class that defines all singletons. SingletonData is a user-defined class that will be used in a single instance.

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The slab allocator was originally designed by Jeff Bonwick of Sun Microsystems. It is a memory management scheme that helps reduce the problem of fragmentation of internal memory, which is caused by the system allocating a larger block of memory than was originally requested. To understand slab allocation, you need to know the meaning of slab and cache in context. A slab is one contiguous chunk of memory that represents one memory allocation. A cache is a very efficient chunk of memory that is used to hold only one type of data. Each cache is made out of one or more slabs. Each object is initially marked as free, which means that the slab is empty. When a process requests a new object from the kernel, the system will attempt to find a location on a partially filled slab, which will be used to place the object. If a partial slab is not found that will fit the object, a new slab is allocated from contiguous physical memory and that slab is added to the cache. When a slab becomes full, it is then marked as used. Slab allocation has many benefits, but one major benefit is that the requested memory allocation size is the same as the actual allocation. This avoids fragmentation of memory and makes allocation very efficient. For more information, you should read Jeff Bonwick s paper on the slab allocator, which is available online.

suggesting that you are invoking a platform-specific binary Basically, P/Invoke lets you create a managed entry point to your native function If the native code you want to call is not exposed as a native, exported function, you can t use P/Invoke P/Invoke works well for calling Win32 APIs, and it is widely used in CLI languages for this purpose There are some complexities in using P/Invoke, since you have to declare managed analogs for any native structs that are passed into the function, and this is sometimes tricky Also, there is considerable overhead due to switching from managed to native code and back again, as you ll see In addition to P/Invoke, the CLR provides support for COM interop You can create instances of proxy objects to COM objects in managed code.

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