How to use it. 1  Open Excel & VBA editor 2  (+) Insert the code below under Sheet1. 3  Go back to Excel and select your desired range to fill with random & non-repeating numbers.  Execute the macro (+)
See also What are the rules about using an underscore in a C++ identifier; a lot of the same rules apply to both C and C++, though the embedded double-underscore rule is in C++ only, as mentioned at the top of this answer. Names with double leading underscores are reserved for use by the implementation.
Underscore provides over 100 functions that support both your favorite workaday functional helpers: map, filter, invoke â as well as more specialized goodies: function binding, javascript templating, creating quick indexes, deep equality testing, and so on. A complete Test Suite is included for your perusal.