Declaring a reusable formula and using it in other scopes.

H. S. Teoh hsteoh at
Sat Feb 12 20:27:25 UTC 2022

On Sat, Feb 12, 2022 at 05:52:01PM +0000, Basile B. via Digitalmars-d-learn wrote:
> The problem with that solution is that it's not clean.
> The problem of the initial problem is to have automatic capture of `i`
> and `args` in any scope...
> Lost cause ?

Lost cause, IMO.

Automatic capture of arbitrary identifiers, while it seems useful at
first glance, leads to all sorts of problems down the road. Consider,
for example, what happens if a typo made it capture something in an
outer or global scope, for example. Or if `i` and `args` happen to be
defined with the wrong types. Or if somebody modified the mixin to
capture something *other* than what you expected it to capture (i.e.,
encapsulation breakage).  If you work through these unwanted cases, you
eventually have to conclude that explicitly passing them as arguments is
globally superior, in spite of being locally more inconvenient.


Век живи - век учись. А дураком помрёшь.

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