• Andre Pany (11/13) Jun 13 2017 Hi,
• Balagopal Komarath (18/18) Jun 13 2017 Are you looking for something like this?
• =?UTF-8?Q?Ali_=c3=87ehreli?= (4/5) Jun 13 2017 You're close. :)
• Andre Pany (4/9) Jun 13 2017 Thanks :)

Andre Pany <andre s-e-a-p.de> writes:

Hi,

I loop through a structure during compile time and want to check 
whether a field of the structure is of type Nullable.

Therefore I use the TemplateOf traits which works for Nullable 
fields but raises an error for fields which are structures and 
not templated.

static if(is(T == struct) && __traits(isSame, TemplateOf!T, 
Nullable)){}
 template std.traits.TemplateOf does not match any template 
 declaration


I can not find a traits "isTemplateOf". Is there are workaround?

Kind regards
André

Balagopal Komarath <baluks gmail.com> writes:

Are you looking for something like this?

import std.typecons;
import std.traits;

alias yes = Nullable!int;

struct no {}

template isNullable(T : Nullable!X, X)
{
     enum isNullable = true;
}

template isNullable(T)
{
     enum isNullable = false;
}

void main()
{
     static assert(isNullable!yes);
     static assert(!isNullable!no);
}

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 06/13/2017 02:00 AM, Andre Pany wrote:

 I can not find a traits "isTemplateOf".

You're close. :)

   https://dlang.org/phobos/std_traits.html#isInstanceOf

Ali

Andre Pany <andre s-e-a-p.de> writes:

On Tuesday, 13 June 2017 at 09:18:47 UTC, Ali Çehreli wrote:
 On 06/13/2017 02:00 AM, Andre Pany wrote:

 I can not find a traits "isTemplateOf".

 You're close. :)

   https://dlang.org/phobos/std_traits.html#isInstanceOf

 Ali

Thanks :)

Kind regards
André