On 24 February 2020 03:26:19 GMT+00:00, Marco Pivetta <ocram...@gmail.com>
wrote:
>The solution is trivial: don't use cloning:
>
>final class Foo
>{
> public function withBar($bar):self {
> $instance = new self();
> $instance->foo = $foo;
> // more assignments here - unavoidable
> return $instance;
> }
>}
This works fine on paper, but is completely impractical as the class grows.
Consider a class with 10 such properties, each with their own with* method:
switching from clone to explicit assignments means adding 90 lines of code, all
of it copy-and-pasted boilerplate that's hard to spot mistakes in.
It's also impossible to use with inheritance, or to compose with traits (as
Diactoros does, for instance), because every with* method needs to know the
full details of how to create a partial clone.
Regards,
--
Rowan Tommins
[IMSoP]
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