• Satoshi (8/8) Oct 20 2016 Hello,
• rikki cattermole (2/10) Oct 20 2016 Because an int is not a Foo.
• Satoshi (4/18) Oct 20 2016 Oh, really? I didn't notice that... (sarcasm)
• Meta (6/8) Oct 20 2016 It's because for some weird reason, this type of varargs allows
• =?UTF-8?B?Tm9yZGzDtnc=?= (2/10) Oct 20 2016 Being explicit about these things makes complex code more clear.
• Satoshi (10/24) Oct 20 2016 With class it works fine.

Satoshi <satoshi gshost.eu> writes:

Hello,
why ... cannot be used with structs?

struct Foo {
     this(int a) { }
}

void bar(Foo foo...) {

}

bar(42);

rikki cattermole <rikki cattermole.co.nz> writes:

On 21/10/2016 1:48 AM, Satoshi wrote:
 Hello,
 why ... cannot be used with structs?

 struct Foo {
     this(int a) { }
 }

 void bar(Foo foo...) {

 }

 bar(42);

Because an int is not a Foo.

Satoshi <satoshi gshost.eu> writes:

On Thursday, 20 October 2016 at 12:52:42 UTC, rikki cattermole 
wrote:
 On 21/10/2016 1:48 AM, Satoshi wrote:
 Hello,
 why ... cannot be used with structs?

 struct Foo {
     this(int a) { }
 }

 void bar(Foo foo...) {

 }

 bar(42);

 Because an int is not a Foo.


Oh, really? I didn't notice that... (sarcasm)

If I change struct Foo to class Foo it works.

Meta <jared771 gmail.com> writes:

On Thursday, 20 October 2016 at 14:29:53 UTC, Satoshi wrote:
 Oh, really? I didn't notice that... (sarcasm)

 If I change struct Foo to class Foo it works.

It's because for some weird reason, this type of varargs allows 
implicit construction of an object. I don't know why, it's just a 
feature that was added a long time ago and never removed. However 
as you can see, it doesn't work for structs and IMO you should 
never use it.

=?UTF-8?B?Tm9yZGzDtnc=?= <per.nordlow gmail.com> writes:

On Thursday, 20 October 2016 at 12:48:34 UTC, Satoshi wrote:
 Hello,
 why ... cannot be used with structs?

 struct Foo {
     this(int a) { }
 }

 void bar(Foo foo...) {

 }

 bar(42);

Being explicit about these things makes complex code more clear.

Satoshi <satoshi rikarin.org> writes:

On Thursday, 20 October 2016 at 16:04:00 UTC, Nordlöw wrote:
 On Thursday, 20 October 2016 at 12:48:34 UTC, Satoshi wrote:
 Hello,
 why ... cannot be used with structs?

 struct Foo {
     this(int a) { }
 }

 void bar(Foo foo...) {

 }

 bar(42);

 Being explicit about these things makes complex code more clear.

With class it works fine.
https://dlang.org/spec/function.html#typesafe_variadic_functions

I have struct Point(x, y) and I want to let the people call some 
methods with Point or just pass x and y argument. I can make 
Point as a class but it's not efficient.

I think this
void moveMouseTo(float x, float y);
is same clear as
void moveMouseTo(Point point);