[Pxtl]

Briefly, but I think there are like three people in the world that fully grok C++ grammar, and I'm definitely not one of them. I just know that C++ generally has some kind of infix operator or delimiter between pairs of immediate data or variables, I'm pretty sure it's currently just a compiler error in every case.

[nightcracker]

Except this is not C++ grammar, this is simple lexical analysis. And separating by spaces would work fine.

[dallos]

What about semantics? Probably 0.