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digitalmars.D.bugs - [Issue 3600] New: template instantiation with empty tuple

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           Summary: template instantiation with empty tuple
           Product: D
           Version: 2.036
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: garick_home_333 rambler.ru


--- Comment #0 from garick <garick_home_333 rambler.ru> 2009-12-08 01:36:10 PST
---
string func( A... )( string name, string v )
{
    return "int " ~ name ~ " = " ~ v ~ ";";
}

void main()
{
    writeln( func!( int, long, float )( "val", "10" ) );
    writeln( func!()( "tmp", "77" ) ); // D 2.036 successfully compile this,   
                                       // but not 2.037
    // worked in 2.037
    alias func!() TMP;
    writeln( TMP( "tmp", "77" ) ); 
}

2.037 output:
funcmix.d(13): Error: template funcmix.func(A...) does not match any function
template declaration
funcmix.d(13): Error: template funcmix.func(A...) cannot deduce template
function from argument types !()(string,string)
funcmix.d(13): Error: template instance errors instantiating template

May be because '()' and '()' tuples are incompartible ?
see Issue 3278

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garick <garick_home_333 rambler.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major


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Rainer Schuetze <r.sagitario gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch
                 CC|                            |r.sagitario gmx.de


--- Comment #1 from Rainer Schuetze <r.sagitario gmx.de> 2009-12-29 04:12:05
PST ---
I don't know why this worked before and could not see a change that caused the
regression from version 2.036, but here is a patch that adds an empty type
tuple to the deduced template parameters if it has not yet been created and
does not show up in the function parameters:

Index: template.c
===================================================================
--- template.c    (revision 317)
+++ template.c    (working copy)
   -1142,6 +1142,13   

     /* Fill in any missing arguments with their defaults.
      */
+    if(tp && fptupindex < 0 && nargsi == dedargs->dim - 1)
+    { // for variadic type parameters not in function parameters, allow empty
tuple
+        Tuple *t = new Tuple();
+        dedargs->data[dedargs->dim - 1] = (void *)t;
+        nargsi++; 
+    }
+
     for (i = nargsi; i < dedargs->dim; i++)
     {
     TemplateParameter *tp = (TemplateParameter *)parameters->data[i];

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Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug yahoo.com.au
           Severity|major                       |regression


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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla digitalmars.com


--- Comment #2 from Walter Bright <bugzilla digitalmars.com> 2010-01-18
01:14:55 PST ---
Changeset 340

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prev sibling parent d-bugmail puremagic.com writes:
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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


--- Comment #3 from Walter Bright <bugzilla digitalmars.com> 2010-01-30
22:45:55 PST ---
fixed dmd 2.040

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Jan 30 2010