• rumbu (31/31) Feb 15 2015 This problem appears only if one of the parameters is an
• Baz (12/44) Feb 15 2015 it's intereting to note that if func() are rewritten:
• Meta (3/35) Feb 16 2015 I have submitted a bug report here:

"rumbu" <rumbu rumbu.ro> writes:

This problem appears only if one of the parameters is an 
interface. Without it or using any other type as a second 
parameter instead of the interface, it compiles. Also it compiles 
if the passed interface is null. The example below uses 
short/ushort, but I found the same behaviour for any combination 
of integral types of the same bitsize (byte/ubyte/char, 
ushort/short/wchar, int/uint/dchar, long/ulong)

D 2.066.1

interface I {}
class C: I {}

void func(ushort s, I i)
{
     writeln("ushort overload");
}

void func(short s, I i)
{
     writeln("short overload");
}

void call(short s)
{
     C c = new C();
     I d = new C();
     func(s, c); // ---- ERROR ---- see below

     //but these are ok

     func(s, cast(I)c) //ok
     func(s, d) //ok
     func(s, null) //ok

}

main.func called with argument types (short, C) matches both:	
main.func(short s, I i)	
main.func(ushort s, I i)	

"Baz" <bb.temp gmx.com> writes:

On Sunday, 15 February 2015 at 23:48:50 UTC, rumbu wrote:
 This problem appears only if one of the parameters is an 
 interface. Without it or using any other type as a second 
 parameter instead of the interface, it compiles. Also it 
 compiles if the passed interface is null. The example below 
 uses short/ushort, but I found the same behaviour for any 
 combination of integral types of the same bitsize 
 (byte/ubyte/char, ushort/short/wchar, int/uint/dchar, 
 long/ulong)

 D 2.066.1

 interface I {}
 class C: I {}

 void func(ushort s, I i)
 {
     writeln("ushort overload");
 }

 void func(short s, I i)
 {
     writeln("short overload");
 }

 void call(short s)
 {
     C c = new C();
     I d = new C();
     func(s, c); // ---- ERROR ---- see below

     //but these are ok

     func(s, cast(I)c) //ok
     func(s, d) //ok
     func(s, null) //ok

 }

 main.func called with argument types (short, C) matches both:	
 main.func(short s, I i)	
 main.func(ushort s, I i)

it's intereting to note that if func() are rewritten:

---
void func(ref ushort s, I i){}
void func(ref short s, I i){}
---

or even

---
void func(const ref ushort s, I i){}
void func(const ref short s, I i){}
---

the problem doesn't happend.

"Meta" <jared771 gmail.com> writes:

On Sunday, 15 February 2015 at 23:48:50 UTC, rumbu wrote:
 This problem appears only if one of the parameters is an 
 interface. Without it or using any other type as a second 
 parameter instead of the interface, it compiles. Also it 
 compiles if the passed interface is null. The example below 
 uses short/ushort, but I found the same behaviour for any 
 combination of integral types of the same bitsize 
 (byte/ubyte/char, ushort/short/wchar, int/uint/dchar, 
 long/ulong)

 D 2.066.1

 interface I {}
 class C: I {}

 void func(ushort s, I i)
 {
     writeln("ushort overload");
 }

 void func(short s, I i)
 {
     writeln("short overload");
 }

 void call(short s)
 {
     C c = new C();
     I d = new C();
     func(s, c); // ---- ERROR ---- see below

     //but these are ok

     func(s, cast(I)c) //ok
     func(s, d) //ok
     func(s, null) //ok

 }

 main.func called with argument types (short, C) matches both:	
 main.func(short s, I i)	
 main.func(ushort s, I i)	

I have submitted a bug report here:

https://issues.dlang.org/show_bug.cgi?id=14187