True and False functions as “oneliners”
I was reading Stephen Cleary’s A New Pattern for Exception Logging blogpost and the True and False methods caught my eye and I wanted to write them as “oneliners”.
By “oneliner” I mean method that’s using expression body. If you’re looking for answer to “Why?", I don’t have it. So, let’s consider it a quick exercise in C#.
The expression body as the name implies, has to be expression and not bunch of statements in a block. I need to call an Action and return bool. Which is actually Func<bool>. Having that it’s easy to do so.
public static bool False(Action action) => new Func<bool>(() => { action(); return false; })();
You might not like the new being there, luckily casting works just fine.
public static bool False(Action action) => ((Func<bool>)(() => { action(); return false; }))();
Both versions result in same IL, so at the end of the day, it’s only about your personal preference.
And finally, as a little bit of fiddling it can be made bit more obfuscated. Or succinct?
using a = System.Action;
using b = System.Func<bool>;
class C
{
const bool f = false;
public static bool False(a a) => ((b)(() => { a(); return f; }))();
}
I’ll leave this exercise here, because I feel it could end up with very ugly code.
