Is const_cast safe?

Question

I can\'t find much information on const_cast. The only info I could find (on Stack Overflow) is:

The const_cast<>() i

Answer 1

I find it hard to believe that that's the only information you could find about const_cast. Quoting from the second Google hit:

If you cast away the constness of an object that has been explicitly declared as const, and attempt to modify it, the results are undefined.

However, if you cast away the constness of an object that has not been explicitly declared as const, you can modify it safely.