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digitalmars.D.bugs - [Issue 10485] New: can not distinguish method call in string mixin!

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=10485

           Summary: can not distinguish method call in string mixin!
           Product: D
           Version: D2
          Platform: All
        OS/Version: Windows
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: changlon gmail.com



code:
---------------
class TestClass{
    void call(){
    }
}

mixin template test(string name){
    mixin("scope " ~ name ~ " = new TestClass;" );
    mixin( name ~ ".call();" );
}

void main(){
    mixin test!("var");
    var.call();
}
---------------

error:
--------------
debug.d(10): Error: function declaration without return type. (Note that
constructors are always named 'this')
debug.d(10): Error: no identifier for declarator var.call()
debug.d(10): Error: function debug.TestClass.call is used as a type
debug.d(14): Error: mixin debug.main.test!("var") error instantiating
--------------

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Jun 26 2013
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=10485




this seems is a     different but related bug:

code:
----------------------
class TestClass{}
mixin template test(string name){
    mixin("scope " ~ name ~ " = new TestClass;" );
}
void main(){
    mixin test!("var");
}
---------------------

run error:
--------------------
object.Error: Illegal Instruction
----------------
0x0012FE30
0x00402BFC
0x00402C37
0x00402835
0x00402098
0x7C817067 in RegisterWaitForInputIdle
--------------------

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prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=10485


Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich gmail.com
         Resolution|                            |INVALID



06:49:54 PDT ---
Templates can only be used to create declarations, not expressions. One
workaround is to write the code like the following:

-----
import std.stdio;

class TestClass
{
    void call()
    {
        writeln("called");
    }
}

mixin template test(string name)
{
    struct S
    {
        void call()
        {
            scope tc = new TestClass;
            tc.call();
        }
    }

    mixin("S " ~ name ~ ";");
}

void main(){
    mixin test!("var");
    var.call();
}
-----

But note that 'scope' is a feature that will eventually be deprecated.

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Jun 27 2013
prev sibling next sibling parent d-bugmail puremagic.com writes:
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06:50:57 PDT ---


 this seems is a     different but related bug:
 
 code:
 ----------------------
 class TestClass{}
 mixin template test(string name){
     mixin("scope " ~ name ~ " = new TestClass;" );
 }
 void main(){
     mixin test!("var");
 }
 ---------------------


It seems to be a bug related to scope, if you change it to 'auto' it will work.
You could file this as a separate bug, but since scope is guaranteed to go away
soon in a future release chances are low that it will be fixed.

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Jun 27 2013
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=10485




Thanks for the quick response.

I will use that scope late, the struct wrapper will not work here.

I use this:

-----
string test(string name, alias T1)(){
    string code    = "scope " ~ name ~ " = new ubyte[ " ~ T1.stringof~ ".length
+ 1 ];\n" ;
    code    ~= data ~ "[$-1] = 0;\n" ;
    return code ;
}
void main(strings args){
    mixin( test!("var",  args[0]) ) ;
    capi_call(var.ptr);
}
----

I will create bug for scope mixin.

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