Robuta

https://www.boost.org/doc/libs/latest/libs/mpl/doc/tutorial/lambda-and-non.html

https://www.boost.org/doc/libs/1_69_0/libs/mpl/doc/tutorial/numeric-metafunction.html

https://www.boost.org/doc/libs/latest/libs/tti/doc/html/the_type_traits_introspection_library/tti_detail_has_template/tti_detail_has_template_metafunction.html

https://www.boost.org/doc/libs/1_60_0/libs/tti/doc/html/boost/tti/valid_member_metafunction.html

https://www.boost.org/doc/libs/1_83_0/libs/hana/doc/html/group__group-_metafunction.html

https://www.boost.org/doc/libs/1_74_0/libs/mpl/doc/refmanual/limit-metafunction-arity.html