Default values in a C Struct

Question

I have a data structure like this:

    struct foo {
        int id;
        int route;
        int backup_route;
        int current_route;
    }

and a

Answer 1

allows you to define variadic functions (which accept an indefinite number of arguments, like printf()). I would define a function which took an arbitrary number of pairs of arguments, one which specifies the property to be updated, and one which specifies the value. Use an enum or a string to specify the name of the property.