Naming convention for params of ctors and setters

Question

For those of you who name you member variables with no special notation like m_foo or foo_, how do you name parameters to your ctors and setters?

Answer 1

Number two has problems as a convention, although in your case it could be harmless. A name that has a leading underscore followed by an uppercase character is reserved for the implementation, and all names with leading underscores are reserved in a global context. If you never have class members beginning with uppercase letters (I don't), you're safe with the convention as shown (using _foo only as a function argument), but I dislike naming conventions that skirt anywhere near the limits.