What am I doing wrong?

void f() {}

writeln(typeof(f).stringof);   // prints "void()"

writeln(is(f == function));    // prints "false"

On Tuesday, 9 March 2021 at 02:50:11 UTC, Andrey Zherikov wrote:
> writeln(is(f == function));    // prints "false"

try

is(typeof(f) == function)

it is kinda weird but that's the trick

On Tuesday, 9 March 2021 at 02:57:46 UTC, Adam D. Ruppe wrote:
> try
>
> is(typeof(f) == function)
>
> it is kinda weird but that's the trick

Thanks!
Should it work for in this case as well?

alias f = (){};

writeln(typeof(f).stringof);        // prints "void function() pure nothrow @nogc @safe"

writeln(is(typeof(f) == function)); // prints "false"

On Tuesday, 9 March 2021 at 11:58:45 UTC, Andrey Zherikov wrote:
> Should it work for in this case as well?
>
> alias f = (){};

I actually don't know. The docs do say that function pointers work differently - they match `is(typeof(f) == return)` but it isn't clear if it would match == function.

You'd certainly think it would... but idk.

On Tuesday, 9 March 2021 at 11:58:45 UTC, Andrey Zherikov wrote:
> On Tuesday, 9 March 2021 at 02:57:46 UTC, Adam D. Ruppe wrote:
>> try
>>
>> is(typeof(f) == function)
>>
>> it is kinda weird but that's the trick
>
> Thanks!
> Should it work for in this case as well?
>
> alias f = (){};
>
> writeln(typeof(f).stringof);        // prints "void function() pure nothrow @nogc @safe"
>
> writeln(is(typeof(f) == function)); // prints "false"

Does Unqual help here?: https://dlang.org/phobos/std_traits.html#Unqual

On Tuesday, 9 March 2021 at 11:58:45 UTC, Andrey Zherikov wrote:
> On Tuesday, 9 March 2021 at 02:57:46 UTC, Adam D. Ruppe wrote:
>> try
>>
>> is(typeof(f) == function)
>>
>> it is kinda weird but that's the trick
>
> Thanks!
> Should it work for in this case as well?
>
> alias f = (){};
>
> writeln(typeof(f).stringof);        // prints "void function() pure nothrow @nogc @safe"
>
> writeln(is(typeof(f) == function)); // prints "false"

Not quite straightforward, but "void function()" is actually a pointer to function, you need to dereference it first:

is(typeof(*f) == function)

On Tuesday, 9 March 2021 at 18:53:06 UTC, Boris Carvajal wrote:
> On Tuesday, 9 March 2021 at 11:58:45 UTC, Andrey Zherikov wrote:
>> On Tuesday, 9 March 2021 at 02:57:46 UTC, Adam D. Ruppe wrote:
>>> try
>>>
>>> is(typeof(f) == function)
>>>
>>> it is kinda weird but that's the trick
>>
>> Thanks!
>> Should it work for in this case as well?
>>
>> alias f = (){};
>>
>> writeln(typeof(f).stringof);        // prints "void function() pure nothrow @nogc @safe"
>>
>> writeln(is(typeof(f) == function)); // prints "false"
>
> Not quite straightforward, but "void function()" is actually a pointer to function, you need to dereference it first:
>
> is(typeof(*f) == function)

That's a trick! Thank you!