get from tuple by type

[ketmar via Digitalmars-d-learn]

p.s. to be clear: it's freaking hard to do metaprogramming and template 
functional programming in c++, that's why c++ committee accepts such 
things. and it's very easy to write such code in D, so this is a good 
excersise for newcomers and almost no-brainer for expirienced D user.
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