• flyinghearts <flyinghearts qq.com> Dec 01 2010
• Jonathan M Davis <jmdavisProg gmx.com> Dec 01 2010
• "Steven Schveighoffer" <schveiguy yahoo.com> Dec 01 2010

flyinghearts <flyinghearts qq.com> writes:

void check(string s)  {}
void check(wstring s) {}
void check(dstring s) {}

void main()
{
  check("test");
  //check("test"c);
}


D:\Desktop\d\zb.d(7): Error: function zb.check called with argument types:
	((string))
matches both:
	zb.check(string s)
and:
	zb.check(immutable(dchar)[] s)





The type of "test" is string, isn't it?

Jonathan M Davis <jmdavisProg gmx.com> writes:

On Wednesday, December 01, 2010 08:42:23 flyinghearts wrote:
 void check(string s)  {}
 void check(wstring s) {}
 void check(dstring s) {}
 
 void main()
 {
   check("test");
   //check("test"c);
 }
 
 
 D:\Desktop\d\zb.d(7): Error: function zb.check called with argument types:
 	((string))
 matches both:
 	zb.check(string s)
 and:
 	zb.check(immutable(dchar)[] s)
 
 
 
 
 
 The type of "test" is string, isn't it?


Not exactly. A string literal implictly casts to all 3 string types. You can
add 
a suffix to force it to be a wstring or dstring (I don't think that there's a
suffix 
for a normal string though), or you can cast it to the exact one you want, or 
you can assign it to a variable first. If you use auto, I believe that it will 
default to string rather than wstring or dstring, but string literals
implicitly 
cast to all 3, so the compiler considers your code to be ambiguous.

- Jonathan M Davis

"Steven Schveighoffer" <schveiguy yahoo.com> writes:

On Wed, 01 Dec 2010 13:58:25 -0500, Jonathan M Davis <jmdavisProg gmx.com>  
wrote:

 On Wednesday, December 01, 2010 08:42:23 flyinghearts wrote:
 void check(string s)  {}
 void check(wstring s) {}
 void check(dstring s) {}

 void main()
 {
   check("test");
   //check("test"c);
 }


 D:\Desktop\d\zb.d(7): Error: function zb.check called with argument  
 types:
 	((string))
 matches both:
 	zb.check(string s)
 and:
 	zb.check(immutable(dchar)[] s)





 The type of "test" is string, isn't it?


 Not exactly. A string literal implictly casts to all 3 string types. You  
 can add
 a suffix to force it to be a wstring or dstring (I don't think that  
 there's a suffix
 for a normal string though), or you can cast it to the exact one you  
 want, or
 you can assign it to a variable first. If you use auto, I believe that  
 it will
 default to string rather than wstring or dstring, but string literals  
 implicitly
 cast to all 3, so the compiler considers your code to be ambiguous.


I think it's a bug.  This compiles:

void check(int i) {}
void check(long i) {}
void check(short i) {}

void main()
{
     check(1);
}

-Steve