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sort_field = "idnum"; std::sort(emps.begin(), emps.end(), [&sort_field](const employee& a, const employee& b){ /* code to select and compare field */ }); return ; } it is possible to use function objects in situations other than as callback functions. in this case, the shortened term functor is normally not
public static void main() { list items = new list { , , , }; items.sort((x, y) => x - y); } } in d[ edit ] d provides several ways to declare function objects: lisp/python-style via closures or c#-style via delegates , respectively: bool find(t)(t[] haystack, bool delegate(t) needle_test) { foreach (straw...
https://en.wikipedia.org/wiki/Function_object