Value to PtrValue

[Michael Hoisie]

There's a function reflect.Indirect, which takes a Value and, if it's
a PtrValue, returns the underlying Value.

Is there an opposite of this function? Something like
reflect.AddressOf, which takes a Value and returns a PtrValue to the
underlying object? I can't seem to find it, but it would be really
useful.

Case in point: I'm trying to make a small change to the template
package, and in that code the data source is passed around by its
Value object. Once in a while I'd like to check whether or not the
Value has any methods, but you can only do this with a PtrValue.

[Russ Cox]

On Wed, Dec 9, 2009 at 20:35, Michael Hoisie <hoi...@gmail.com> wrote:
> There's a function reflect.Indirect, which takes a Value and, if it's
> a PtrValue, returns the underlying Value.
>
> Is there an opposite of this function? Something like
> reflect.AddressOf, which takes a Value and returns a PtrValue to the
> underlying object? I can't seem to find it, but it would be really
> useful.

It would be, but no. The fundamental problem is that
once you've got a value, you can't just take its address:
an expression like &3 doesn't make any sense.
If the pointer is important, the solution is to keep
it around instead of throwing it away and trying to
get it back.

Russ