@system blocks and safer @trusted (ST) functions
anonymous at example.com
Mon Jul 26 00:21:32 UTC 2021
On Sunday, 25 July 2021 at 23:16:16 UTC, jfondren wrote:
> I recommend this justification for the DIP: what you are doing
> is *rehabilitating @trusted functions*, which are currently
> (for newbies) a bug-filled trap, and (for experts) disused in
> favor of @safe functions containing @trusted blocks. The
> language documentation tells people to use @trusted functions
> but the language in practice doesn't really have them.
The language doesn't have @trusted blocks. @trusted function
literals (lambdas) are still functions. Everything the
documentation says about @trusted functions applies to function
People do like to treat @trusted function literals as if they
were the proposed @system blocks. But then they're strictly
speaking writing invalid code. They're cheating. And why not? It
has significant advantages for the low price of (1) tainting some
@safe code and (2) having a technically invalid program that
works just fine in practice.
What the proposal does is turning the common cheat into an
official part of the language, a best practice even. And the
syntax gets a bit nicer.
More information about the Digitalmars-d