Should we add `a * b` for vectors?

[jmh530]

On Friday, 6 October 2017 at 20:36:47 UTC, Jonathan M Davis wrote:
>
> It forces them to actually be designed with the type and be 
> easily located with the type. Would you want a programmer to be 
> able to go and implement opBinary!"+" for strings? I sure 
> wouldn't. And I don't want anyone doing that for user-defined 
> types that they didn't define either.
>

Tangentially (I admit), there's nothing stopping you from below:

struct MyString
{
     string mystring;
     alias mystring this;
     string opBinary(string op)(string rhs)
         if(op == "+")
     {
         return mystring ~ rhs;
     }
}

void main()
{
     MyString x = MyString("foo");
     string y = "bar";
     auto z = x + y;
     assert(z == "foobar");
}