Pass a pointer to a function as read-only in C

Question

Just as the title says, can I pass a pointer to a function so it\'s only a copy of the pointer\'s contents? I have to be sure the function doesn\'t edit the contents.

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Answer 1

I have to be sure the function doesn't edit the contents.

What contents? The value pointed to by the pointer? In this case, you can declare your function like

void function(const int *ptr);

then function() cannot change the integer pointed to by ptr.

If you just want to make sure ptr itself is not changed, don't worry: it's passed by value (as everything in C), so even if the function changes its ptr parameter, that won't affect the pointer that was passed in.