C++Now 2017

Slides: https://github.com/boostcon/cppnow_presentations_2017/blob/master/05-17-2017_wednesday/type_based_template_metaprogramming_is_not_dead__odin_holmes__cppnow_05-17-2017.pdf
Video: https://www.youtube.com/watch?v=EtU4RDCCsiU

Boost.Hana with its claim to the title "your standard library for metaprogramming" has opened this domain to many. For library implementers and experts however there is one thing Hana's new value based metaprogramming is lacking, compilation speed. In this talk I will present several new patterns which allow type based metaprograms to reach mammoth size at acceptable compilation speed. The separation of algorithm and data as well as the composition of operations allow us to save most of the intermediate types so that the compiler has far less work when calculating the same result.