can't differentiate between Bool and int when overloading function

I read something like this
"can't differentiate between Bool and int when overloading function"

can anyone tell me this with an example ?
Where did you read it?
a booked called "more effective c++"
The book talks about ways to fake bools (using enumerations or integer constants) in case you compiler doesn't have support for the bool type. If that is the case I think a much better solution is to upgrade your compiler. All modern compilers can handle bools without problems.
@peter87, Thanks
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