[c++0x] Patch for std::next/prev

[Paolo Carlini]

Hi,

--- Original Message ---
> Implemented based on N2606. Test cases provided.

Looks mostly good, many thanks, I'll commit it asap. For your next contributions a few minor nits:

1- Uglify, always uglify, forever (I hope not ;) uglify: n -> __n , x -> __x, etc.
2- Always wrap to 80 columns
3- Watch the indentations, each is always 2 spaces wide in our codebase.
4- Remember the test variable in testcases (a long story but goes with the VERIFY dance)
5- As a stylistic matter, the main in the testcases always ends with return 0;
6- In general, each testfile includes *1* test function and main (much easier to deal with fails on exotic targets)
7- Last but not least, *never* fiddle with the headers! I.e., never leave out the

// Copyright (C) 2008 Free Software Foundation, Inc.

line.

Thanks again,
Paolo.