There's a compiler extension to tag variables with a function called on scope exit. Attribute cleanup. For dubious portability reasons I'm unwilling to rely on it for correctness but it's really useful in a debug build for types where you can detect they haven't been cleaned up.

Change MyType to RAIIMyType or similar in the function to get the checking when using GCC/clang with asserts enabled. In practice sometimes types should drop out of scope without deallocation - return from functions etc. Thinking about it now I should probably apply it by default and use (MyType) to avoid the macro expansion selectively.