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DLL Memory Allocation destructors

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So I don't know if I will be able to explain my problem well... but this is it. My engine is split into modules.. I have a base class allocator called "ITagAllocator" ... the renderer module ( a separate dll) has a function called RendererModule::CreateAllocator().. that passes back a derived class for allocation. When I'm done using the allocator I send a task to the rendering thread to destroy the allocator. The problem seems to be that the memory doesn't seem to be released. But if I create a derived class using the same exact code in my "engine" exe.. and send a task to delete it on the rendering thread... the memory is released as expected.

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Assuming you're talking C++, does your base class have a virtual destructor?

Without it, destruction is not passed down to the derived classes, so anything allocated by the derived class is not deleted if you destroy the base class with "delete base;"

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