C++ function parameter as reference

I have a question. Can anyone tell me why someone would declare 开发者_StackOverflow社区parameter r like that ?

Whats the difference between Record& r and Record(&r) ?

QDataStream& operator>>(QDataStream &s, Record(&r))
{
}

Thanks :)

Record(&r) and Record &r are identical type declarations. I don't know why somebody would include the parentheses except for stylistic reasons. Perhaps it's some cruft left over from a refactoring?

As Richard said Record (&r) and Record &r are equivalent. So the important difference is how effectively they communicate the intent of programmer. I personally prefer Record& r over Record &r because I like to separate the type from the name. That said, I would avoid the Record (&r) because it looks so similar to the syntax for function types. For example, Record (&r)() would declare r as a reference to a function such as the following.

Record f() { }