Not precisely so…Interfaces, and type switches, and related mechanisms are
safe. Their type indeterminism is protected from the program and their
concretization is much like Schrodinger’s box…the interface is any type until
you look at it through a type switch or type dereferencing…then it is a living
concrete type of an expected type or else, like the cat, your program is dead.
From: <golang-nuts@googlegroups.com> on behalf of Edward Muller
<edwar...@interlix.com>
Date: Monday, November 7, 2016 at 4:05 PM
To: Kaylen Wheeler <kfjwhee...@gmail.com>, golang-nuts
<golang-nuts@googlegroups.com>
Subject: Re: [go-nuts] Noob question: Pointers to interfaces
FWIW: As soon as interface{} is involved you are no longer "type safe".
On Mon, Nov 7, 2016 at 2:56 PM Kaylen Wheeler <kfjwhee...@gmail.com> wrote:
So, what I'm trying to accomplish is a little unusual, and may need some
explanation.
Basically, I'm trying to find a typesafe way to access a type-indexed map of
components. This map can contain objects of any type, and the keys are
reflect.Type.
One strategy I thought may work would be to pass a pointer to a pointer as an
out-var. Using reflection to determine the pointer's type, it could be
populated with a corresponding value.
For instance, if we did something like this:
c := ComponentCollection{}
c.addComponent(123) // Add an int component
var p : *int
c.getComponent(&p)
In this case, p would point to the int component of c.
That's wht the 2 levels of indirection are necessary: it's an out-var to a
pointer.
Does that make sense?
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