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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Thanks for you comment! I used static cast to explicitly show that it will be int. As far as I know it has no impact during runtime, i.e. check performed only during compilation.
As for lambda, I use it in C# a lot, but C++ is a mishmash on its own, so this was again for clarity reasons. Besides I don't have a foggiest idea how lamda works in C++ "under the hood" :)