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> Well, on second thought, is there any reason why an int function ptr should be any different from an int ptr?

I don't know any other example, but in Itanium, a function pointer is not just an address but an (address+address) pair where the second address is a sort of a base pointer for data segment:

https://stackoverflow.com/a/18908021

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I don't think this is true except maybe on ancient architectures. function ptrs are usually just addresses (64 bits on most modern computers). virtual member function ptrs can have an extra bit of info to resolve the this ptr at runtime.

so usually (but not always), sizeof(int ptr) == sizeof(func ptr)

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