Hello,

I have a function and a struct:
> void foo(ref Data data) { ... }

> struct Data
>{
>    int a;
>    string text;
>}

How to pass struct into function without naming its type?

This doesn't work:

> foo({1234, "Hello!"});

On Monday, 20 August 2018 at 09:23:27 UTC, Andrey wrote:
> Hello,
>
> I have a function and a struct:
>> void foo(ref Data data) { ... }
>
>> struct Data
>>{
>>    int a;
>>    string text;
>>}
>
> How to pass struct into function without naming its type?
>
> This doesn't work:
>
>> foo({1234, "Hello!"});

Create an overload of foo that takes two arguments and combines them into a `Data` struct internally:

void foo(int a, string text)
{
    Data data = {a, text};
    foo(data);
}

On Monday, 20 August 2018 at 11:38:39 UTC, Paul Backus wrote:
> Create an overload of foo that takes two arguments and combines them into a `Data` struct internally:
>
> void foo(int a, string text)
> {
>     Data data = {a, text};
>     foo(data);
> }

Hmm, not very good solution. In C++ you can not to write type and compiler will deduce it automatically. In D, as I understand, this feature isn't supported.

On Monday, 20 August 2018 at 12:33:34 UTC, Andrey wrote:
> On Monday, 20 August 2018 at 11:38:39 UTC, Paul Backus wrote:
>> Create an overload of foo that takes two arguments and combines them into a `Data` struct internally:
>>
>> void foo(int a, string text)
>> {
>>     Data data = {a, text};
>>     foo(data);
>> }
>
> Hmm, not very good solution. In C++ you can not to write type and compiler will deduce it automatically. In D, as I understand, this feature isn't supported.

Yes, D's syntax for structure literals requires you to write the name of the type:

https://dlang.org/spec/struct.html#struct-literal

If the name of the type is too cumbersome to write out, you can use an alias:

alias ShortName = MyLongAndComplicatedType!(PossiblyWith, TemplateArguments);
foo(ShortName(a, text));

On Monday, 20 August 2018 at 12:33:34 UTC, Andrey wrote:
> On Monday, 20 August 2018 at 11:38:39 UTC, Paul Backus wrote:
>> Create an overload of foo that takes two arguments and combines them into a `Data` struct internally:
>>
>> void foo(int a, string text)
>> {
>>     Data data = {a, text};
>>     foo(data);
>> }
>
> Hmm, not very good solution. In C++ you can not to write type and compiler will deduce it automatically. In D, as I understand, this feature isn't supported.

... yet. Though you can vote for this DIP and show your support there:

https://github.com/dlang/DIPs/pull/71

It even comes with an implementation in DMD already:

https://github.com/dlang/dmd/pull/8460

On Monday, 20 August 2018 at 17:45:25 UTC, Seb wrote:
> ... yet. Though you can vote for this DIP and show your support there:
>
> https://github.com/dlang/DIPs/pull/71
>
> It even comes with an implementation in DMD already:
>
> https://github.com/dlang/dmd/pull/8460

How and where to vote?

On Tuesday, 21 August 2018 at 06:29:12 UTC, Andrey wrote:
> On Monday, 20 August 2018 at 17:45:25 UTC, Seb wrote:
>> ... yet. Though you can vote for this DIP and show your support there:
>>
>> https://github.com/dlang/DIPs/pull/71
>>
>> It even comes with an implementation in DMD already:
>>
>> https://github.com/dlang/dmd/pull/8460
>
> How and where to vote?

At the pull request via +1 and the upcoming "official" discussion of the PR.

The last discussion was here (https://forum.dlang.org/post/lpixarbirhorkltaqlew@forum.dlang.org) and it seems there's no clear consensus on the best syntax for this yet :/

On Tuesday, 21 August 2018 at 08:32:17 UTC, Seb wrote:

>>
>> How and where to vote?
>
> At the pull request via +1 and the upcoming "official" discussion of the PR.
>

Except that there's no voting process for DIPs. The Community Review is not intended as a way to vote, simply to provide feedback on it with the aim of making it a better proposal. I know people tend to throw their +1's in there, but I wouldn't expect Walter and Andrei to put any weight on that.

On Tuesday, 21 August 2018 at 08:47:53 UTC, Mike Parker wrote:
> On Tuesday, 21 August 2018 at 08:32:17 UTC, Seb wrote:
>
>>>
>>> How and where to vote?
>>
>> At the pull request via +1 and the upcoming "official" discussion of the PR.
>>
>
> Except that there's no voting process for DIPs. The Community Review is not intended as a way to vote, simply to provide feedback on it with the aim of making it a better proposal. I know people tend to throw their +1's in there, but I wouldn't expect Walter and Andrei to put any weight on that.

I'm aware, but we don't have any other process for people to show their support for a DIP, do we?


And for DMD/Druntime/Phobos etc. having a bunch of +1 helps a PR to move faster as we as reviewers can thus realize that this is sth. that's very important to the community.

On Tuesday, 21 August 2018 at 14:56:21 UTC, Seb wrote:
>
> I'm aware, but we don't have any other process for people to show their support for a DIP, do we?
>
>
> And for DMD/Druntime/Phobos etc. having a bunch of +1 helps a PR to move faster as we as reviewers can thus realize that this is sth. that's very important to the community.

Sure, I know you know. I didn't want anyone reading what you wrote to get the impression that DIP reviews are an actual vote where the +1s are tallied up.