data testing

Please correct me on my translation of this code.
Is the following translation accurate?

Code:

 
#include <limits> // Add this for numeric_limits

...

if ( !( cin>> y ) )  {
  cin.clear(); // Clear the errors
  cin.ignore ( numeric_limits<streamsize>::max(), '\n' );
  cerr<<"Invalid input, try again: ";
}

Translates to if the data inputed into y doesn't match the data type y was declared as then execute the following statements.

A follow up question is what does the header limits do?
Does it hold the details of the following code?

Code:

numeric_limits<streamsize>::max()

1) correct
2) limits holds a lot of information much of it as template specialisations.This is just a way of saying ignore the maximum possible number of chars from cin or up to a newline.