everett1992/couple-solver — pull request #1 by Ouadie (2012-03-20 21:45:04+00:00)
Title: Update test_dir/hash.h

see the answer here : http://stackoverflow.com/questions/9754615/how-do-you-declare-the-friend-of-a-generic-class-outside-of-the-class-decleratio/9754805#comment12443078_9754805