How can I pass a pointer Object ob to a function which prototype is void foo Object amp

Call it like this foo ob Note that there is no casting going on here as suggested in your question title All we have done is de-referenced the pointer to the object which we then pass to the function

[c++] How to cast/convert pointer to reference in C++

foo(*ob);

You don't need to cast it because it's the same Object type, you just need to dereference it.

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