> although I never seen it used in production Well, of course boost has it, they use `<` and `>`: [1] https://www.boost.org/doc/libs/1_78_0/libs/hof/doc/html/

> although I never seen it used in production Well, of course boost has it, they use `<` and `>`: [1] https://www.boost.org/doc/libs/1_78_0/libs/hof/doc/html/include/boost/hof/infix.html https://www.boost.org/doc/libs/1_78_0/libs/hof/doc/html/incl...