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

foo ob You don t need to cast it because it s the same Object type you just need to dereference it

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

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.

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