[Issue 4174] Template interface functions not allowed, making operator overloads difficult

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4174


Steven Schveighoffer <schveiguy at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Template interface          |Template interface
                   |functions not allowed       |functions not allowed,
                   |                            |making operator overloads
                   |                            |difficult


--- Comment #1 from Steven Schveighoffer <schveiguy at yahoo.com> 2010-05-10 14:41:26 PDT ---
Sorry, enter key added the issue when I was typing the summary.

Operator overloads require template functions, yet this doesn't work:

interface I
{
   I addAssign(I other);
   I opOpAssign(string op)(I other) if (op == "+=")
   {
      return this.addAssign(other);
   }
}

void foo(I i)
{
   i += i;
}

error message:

testinterface.d(4): Error: function
testinterface.I.opOpAssign!("+=").opOpAssign template member functions are not
allowed in interface I
testinterface.d(12): Error: template instance testinterface.I.opOpAssign!("+=")
error instantiating

How shall I implement operators for interfaces?

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