@system blocks and safer @trusted (ST) functions
schveiguy at gmail.com
Wed Jul 28 11:12:14 UTC 2021
On Monday, 26 July 2021 at 18:59:45 UTC, Paul Backus wrote:
> The difference between POSIX `read` and `favoriteNumber` is
> that you *can* read the source code of `favoriteNumber`. It's
> literally right there, in the same module. That's the entire
> reason why you can be certain it returns `42`.
> If `favoriteNumber` and `favoriteElement` were in different
> modules, your argument would be correct, because
> `favoriteElement` could no longer be certain about which
> version of `favoriteNumber` it was calling.
If you consider the source to be the spec, then that contradicts
your earlier suggestion that `favoriteNumber` can be changed --
its source is the spec, so changing the source to return
something other than 42 will violate the spec.
If you consider the source to be the spec *and* you think
changing the spec at will is OK, then we have different
philosophies on what a code review and "good software" means.
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