On Tuesday, 27 September 2016 at 09:30:10 UTC, Dicebot wrote:
https://github.com/dlang/DIPs/blob/master/DIPs/DIP1002.md
PR: https://github.com/dlang/DIPs/pull/43
Abstract:
In Python, the try/catch/finally syntax is augmented with an
additional clause, termed else. It is a fantastically useful
addition to the conventional syntax. It works like this:
```
try:
do_something()
except Exception as e:
pass # Runs when an error inheriting from Exception was
raised
else:
pass # Runs when no error was raised
finally:
pass # Runs unconditionally, evaluates last
```
What's annoying is that we already have finally, which can be
reproduced with other language features:
{
/*finally*/ scope (exit) {}
try {
do_something();
} catch (Exception e) {}
}
but we don't (yet) have catch else, which is harder to immitate.
Options are:
A) the else clause is nothrow (in which case it can just go last
inside the try)
or
B) store a flag and have to use immitation finally:
{
/*finally*/ scope (exit) {}
bool exceptionThrown = false;
try {
doSomething();
} catch (Exception e) {
exceptionThrown = true;
}
/*else*/ if (!exceptionThrown) {}
}
