PROPOSAL: Auto-assignment Parameters (original) (raw)

Mark Mahieu markmahieu at googlemail.com
Wed Mar 25 10:33:51 PDT 2009

Hi James,

I looked into inferring the parameter types, and while it does work
quite well for 'brain-dead' POJO classes, it was not so great when
you actually want to put some real code in the constructor, for
example to throw an exception if a parameter value is not valid.

The auto-assignment proposal is very much aimed at helping
programmers with code they actually have to write (and therefore
read and maintain), rather than just generate. If it happens to help
with the latter as well, that's great.

Mark

On 25 Mar 2009, at 13:41, james lowden wrote:

I'd like to see both. Auto-getters/setters/equals/etc. would be really, really nice, but it would also be valuable to have a way of specifying a variety of different constructors to generate, which Mark's proposal would allow for. Example: public data class Foo { private final int x; private final int y; private final String foo; public Foo (this.x) {} public Foo (this.foo, this.y) {} }

(I eliminated the types from the automagical constructors, as they can be inferred by the compiler.)

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