glen <[EMAIL PROTECTED]> writes:
> - I provided an example. It wasn't minimal enough for you?
The problem isn't that the example is not minimal.
The problem is that the example is incomplete. I.e. I can't cut/paste
that example and observe the same error.
It is simple enough to add missing '#include's, to make it complete,
but why are you making *me* work? You should have done that (minimal)
work yourself.
> Let me try again
There is no reason to try again.
You have already been given *the* answer, but you didn't understand it :-(
The answer (from Ulrich Eckhardt) is:
>> Well, anyways, your operator's signature matches _EVERYTHING_, including a
>> character literal.
Let me try to explain that answer for you.
> template<typename C>
> std::ostream& operator<< (std::ostream& op, const C& cpi )
The problem is that this template function will match *anything*.
It will be a match for:
std::cout << 1; // C == "const int"
std::cout << 'a'; // C == "char"
std::cout << "abc"; // C == "const char[4]"
.... etc ...
So it makes all the *standard* "std::operator<<(...)" ambigous,
and compiler tells you exactly that -- that it's "standard"
std::ostream::operator<<(long int)
std::ostream::operator<<(long unsigned int)
std::ostream::operator<<(bool)
std::ostream::operator<<(short int)
... etc ...
have been ambigously overloaded (by you), and compiler now doesn't
know which of these possible overloads it's supposed to call.
I don't see any way to overload ostream::operator<<() such that it
will output arbitrary container, but will not ambiguate standard
overloads.
I think you'll just have to rewrite offending code. Instead of
cout << myRange;
you'll have to do:
print(cout, myRange.begin(), myRange.end()); // [1]
or
myRange.print(cout); // [2]
For [1], it is trivial to define
// warning: untested
template <typename C> std::ostream&
print(std::ostream&,
typename C::const_iterator first,
typename C::const_iterator last) { ... }
For [2], just define appropriate "print" method in the Range class.
Cheers,
--
In order to understand recursion you must first understand recursion.
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