You could use C++ lambdas instead. They're basically structs with a call operator. See also the comparisons from the functional header https://en.cppreference.

You could use C++ lambdas instead. They're basically structs with a call operator. See also the comparisons from the functional header https://en.cppreference.com/w/cpp/header/functional https://en.cppreference.com/w/cpp/header/functional