There could be a couple of examples in Boost like Boost Spirit [0]. Qt had some like putting stuff in containers with bitshift operator. There was a GUI toolkit

There could be a couple of examples in Boost like Boost Spirit [0]. Qt had some like putting stuff in containers with bitshift operator. There was a GUI toolkit that used + operator to put widgets on a window. [0] https://www.boost.org/doc/libs/1_78_0/libs/spirit/doc/html/spirit/introduction.html https://www.boost.org/doc/libs/1_78_0/libs/spirit/doc/html/s...