Robuta

https://www.boost.org/doc/libs/1_53_0/doc/html/boost/accumulators/feature_of_tag_idp26717904.html

https://www.boost.org/doc/libs/1_53_0/doc/html/boost/accumulators/feature_of_tag_idp26768480.html

https://www.boost.org/doc/libs/1_67_0/doc/html/boost/accumulators/feature_1_3_2_6_3_16_1_1_2.html

https://www.boost.org/doc/libs/1_53_0/doc/html/boost/accumulators/as_feature_tag_idp27278880.html

https://www.boost.org/doc/libs/1_53_0/doc/html/boost/accumulators/extract/with_p_square__idp26726176.html

https://www.boost.org/doc/libs/1_53_0/doc/html/boost/accumulators/tag/with_p_square__idp26748880.html