• Algo (16/16) Sep 17 2014 void main()
• Algo (2/18) Sep 17 2014 rvalues cannot be ref it seems
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (14/34) Sep 17 2014 Yes. Interestingly, in D rvalues cannot be bound even to const ref.
• AsmMan (12/28) Sep 18 2014 I was having same issue a while ago. But I realized I was using

"Algo" <algo nonsense.com> writes:

void main()
{
       import std.utf;
       decode("dlang", 1);
}

Error: template std.utf.decode cannot deduce function from
argument types !()(string, int), candidates are:
D:\msc\D\dmd2\windows\bin\..\..\src\phobos\std\utf.d(924):
std.utf.decode(S)(auto ref S str, ref size_t index) if
(!isSomeString!S && isRandomAccessRange!S && hasSlicing!S &&
hasLength!S && isSomeChar!(ElementType!S))
D:\msc\D\dmd2\windows\bin\..\..\src\phobos\std\utf.d(942):
std.utf.decode(S)(auto ref S str, ref size_t index) if
(isSomeString!S)

why doesn't "decode(S)(auto ref S str, ref size_t index) if
(isSomeString!S)" correspond?

"Algo" <algo nonsense.com> writes:

On Thursday, 18 September 2014 at 06:09:54 UTC, Algo wrote:
 void main()
 {
       import std.utf;
       decode("dlang", 1);
 }

 Error: template std.utf.decode cannot deduce function from
 argument types !()(string, int), candidates are:
 D:\msc\D\dmd2\windows\bin\..\..\src\phobos\std\utf.d(924):
 std.utf.decode(S)(auto ref S str, ref size_t index) if
 (!isSomeString!S && isRandomAccessRange!S && hasSlicing!S &&
 hasLength!S && isSomeChar!(ElementType!S))
 D:\msc\D\dmd2\windows\bin\..\..\src\phobos\std\utf.d(942):
 std.utf.decode(S)(auto ref S str, ref size_t index) if
 (isSomeString!S)

 why doesn't "decode(S)(auto ref S str, ref size_t index) if
 (isSomeString!S)" correspond?

rvalues cannot be ref it seems

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 09/17/2014 11:23 PM, Algo wrote:
 On Thursday, 18 September 2014 at 06:09:54 UTC, Algo wrote:
 void main()
 {
       import std.utf;
       decode("dlang", 1);
 }

 Error: template std.utf.decode cannot deduce function from
 argument types !()(string, int), candidates are:
 D:\msc\D\dmd2\windows\bin\..\..\src\phobos\std\utf.d(924):
 std.utf.decode(S)(auto ref S str, ref size_t index) if
 (!isSomeString!S && isRandomAccessRange!S && hasSlicing!S &&
 hasLength!S && isSomeChar!(ElementType!S))
 D:\msc\D\dmd2\windows\bin\..\..\src\phobos\std\utf.d(942):
 std.utf.decode(S)(auto ref S str, ref size_t index) if
 (isSomeString!S)

 why doesn't "decode(S)(auto ref S str, ref size_t index) if
 (isSomeString!S)" correspond?

 rvalues cannot be ref it seems

Yes. Interestingly, in D rvalues cannot be bound even to const ref.

void main()
{
     import std.stdio;
     import std.utf;

     size_t index = 1;
     dchar decoded = decode("dlang", index);

     writefln("decoded '%s', next character is at index %s.",
              decoded, index);
}

The output:

decoded 'l', next character is at index 2.

Ali

"AsmMan" <jckj33 gmail.com> writes:

On Thursday, 18 September 2014 at 06:09:54 UTC, Algo wrote:
 void main()
 {
       import std.utf;
       decode("dlang", 1);
 }

 Error: template std.utf.decode cannot deduce function from
 argument types !()(string, int), candidates are:
 D:\msc\D\dmd2\windows\bin\..\..\src\phobos\std\utf.d(924):
 std.utf.decode(S)(auto ref S str, ref size_t index) if
 (!isSomeString!S && isRandomAccessRange!S && hasSlicing!S &&
 hasLength!S && isSomeChar!(ElementType!S))
 D:\msc\D\dmd2\windows\bin\..\..\src\phobos\std\utf.d(942):
 std.utf.decode(S)(auto ref S str, ref size_t index) if
 (isSomeString!S)

 why doesn't "decode(S)(auto ref S str, ref size_t index) if
 (isSomeString!S)" correspond?

I was having same issue a while ago. But I realized I was using 
function in the wrong way with string type and passing a size_t 
in the 2th argument. You can see use of decode(val, size) in the 
standard library but call it in your code result in an error.

it worked:

string s = readText("file");
decode(cast(ubyte[]) s);

I'm not sure why you're trying to pass a string literal as 
argument because it does need a memory location to change to new 
memory location, where bytes skiped end. That's why it does use 
ref.