On 06/08/2010 22:24, Blonder wrote:
Hello,
this seems to work, but if I add the following
double opBinary(string op, U) (U rhs)
{
static if(op == "^"&& is(U: Group))
{
// do something
return 42;
}
}
because I want to write the following: double d = g^h;
I have the same problem again.
You should only use the static if on the 2nd template parameter.
You want:
class Group {
void opBinrary(string op, U)(U rhs)
if(op == "^") {
}
void opBinrary(string op, U)(U rhs)
if(op == "+") {
}
void opBinrary(string op, U)(U rhs)
if(op == "-") {
}
void opBinrary(string op, U)(U rhs)
if(op == "*") {
}
}
Note that the 'if' is a template constraint is and part of the template
signature; this is what stops you getting multiple matches when trying
to determine which template to use.
You can only use the static if inside the function if all the types U
are similar, otherwise you'll get conversion problems with return values
and such.
>
> This syntax isn't very intuitive.
>
No programming language is intuitive; they all take time to learn.
D is a big win over C++ though and well worth sticking with.
--
My enormous talent is exceeded only by my outrageous laziness.
http://www.ssTk.co.uk
