chaining
grauzone
none at example.net
Thu Feb 26 00:45:28 PST 2009
Brian wrote:
> I want to use a chaining system for easy setting of object attributes,
> which would work great for a single object, unfortunately derived classes
> cannot inherit the chained functions implicitly, whats the best way
> around this?
>
> class Base {
> int x;
> Base foo(int x_) {
> this.x = x_;
> return this;
> }
> }
>
> class Derived : Base {
> Derived bar(int y_) {
> return this;
> }
> }
>
> // usage:
> auto m = (new Derived).foo(10).bar(x); // bar can be accessed through foo
Couldn't you just write the above example as:
auto m = new Derived;
m.foo(10);
m.bar(x);
This is actually much more readable: the reader doesn't need to know
that the functions foo and bar return m; instead, the code uses m
directly. Obviously, this is also simpler to implement than chaining.
I don't get why some people like chaining. Unlike in languages like C++,
you can always use "auto" to keep the typing to a minimum. What more
arguments are there for chaining?
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