Add support implicit conversion between types

[Maxim Fomin]

On Friday, 6 September 2013 at 10:33:07 UTC, ilya-stromberg wrote:
> Do you have any plans to support implicit conversion between 
> types?
>
> I have some code like this:
>
> struct Foo
> {
> 	this(int i)
> 	{
> 		//do something useful
> 	}
> }
>
> void bar(Foo f)
> {
> 	//do something else
> }
>
> void main()
> {
> 	Foo f = 5;//works
> 	
> 	bar(f);//works
> 	
> 	bar(Foo(5));//works
> 	
> 	bar(5);//Error: function app.bar (Foo f) is not callable using
> argument types (int)
> }
>

Actually D has this feature for classes:

class A
{
	this(int) {}
}

void foo(A a ...) {}

void main()
{
	foo(5);
}

This compiles and runs as expected. By the way, the code was 
fixed recently - before 2.063 this was allocating class on stack 
(so in D there were some kind of scoped stack classes), now this 
allocates on heap as usual. I don't see the rationale behind not 
working with structs.