hadley/adv-r — pull request #125 by romainfrancois (2013-12-01 21:18:58+00:00)
Title: few typos and edit package section to adapt to next Rcpp

I assign the copyright of this contribution to Hadley Wickham.

About the XXX note, I've tried to implement match like this:

```cpp
// [[Rcpp::export]]
IntegerVector matchCpp( CharacterVector x, CharacterVector table){
// first train an unordered_map
std::unordered_map map ;
for( int i=0; isecond ;
}
return out ;
}
```

But the compiler complains about missing implementation of `std::hash`. I've logged it as https://github.com/RcppCore/Rcpp/issues/84.