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Quiddity
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how can i write unmanaged c++ code in visual studio .net?
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...Or you can continue to write components in unmanaged C++, taking advantage of the full power and flexibility of the language, and only use Managed Extensions to write thin, high-performance wrappers that make your C++ code callable from .NET Framework components.
Memory for objects is allocated from the managed heap, the chunk of memory that the process uses to store dynamically allocated objects. Every allocation takes some space from the heap, and it is possible that at some point heap memory will be exhausted. In theory if this happens, the garbage collector will be invoked to see if there are any unreferenced objects whose memory can be reclaimed to minimize the size of the heap.
In reality it's not quite that simple. Every dynamically created .NET Framework object belongs to a generation: objects created early in an application's lifecycle belong to generation 0, and younger objects are added to later generations. Dividing objects into generations means you don't have to run the garbage collector on all the objects in the heap, and need only consider the age of a particular object.
Garbage collection occurs when generation 0 is full. Dead objects are reclaimed, then any objects that survived the collection are promoted to generation 1, and new objects are added to generation 0 again. The garbage collector improves efficiency by always running a collection on generation 0 first. If that doesn't free up enough memory, it can move on to run a collection on the next generation. At present, only three generations (0, 1, and 2) are supported by .NET.
You usually let the garbage collector decide when to perform a collection, but you can use the Collect static method of the System::GC class to force a collection if you know you will have a lot of reclaimable objects in your code. Collect lets you run a default collection or specify a particular generation. If you're interested in finding out what generation a particular object belongs to, you can use the System::GC::GetGeneration method, passing in an object reference.