C / C++ / MFC

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1. const_cast<> removes away constness.
   
2. static_cast<> is used for conversions that, although well defined in C++, are not automatically applied by the compiler. Most important examples are truncating arithmetic castings (eg. from double to int) and casting from a base class pointer to a derived class pointer.
   
3. dynamic_cast<> plays a role similar to that of static_cast<> when downcasting from a base class to a derived one, but it has the important difference that the downcasting is checked for validity at run-time, ie. dynamic_cast<> returns 0 if what you are trying to downcast to say A* is not actually a A*. For this to work, classes passed to dynamic_cast<> must be polymorphic, ie. they must have at least one virtual function.
   
4. reinterpret_cast<> is used for anything else, as conversions with no defined meaning in the standard, like for instance converting a pointer to an int.