C++ compiler unable to find function (namespace related)
- by CS student
I'm working in Visual Studio 2008 on a C++ programming assignment. We were supplied with files that define the following namespace hierarchy (the names are just for the sake of this post, I know "namespace XYZ-NAMESPACE" is redundant):
(MAIN-NAMESPACE){
a bunch of functions/classes I need to implement...
(EXCEPTIONS-NAMESPACE){
a bunch of exceptions
}
(POINTER-COLLECTIONS-NAMESPACE){
Set and LinkedList classes, plus iterators
}
}
The MAIN-NAMESPACE contents are split between a bunch of files, and for some reason which I don't understand the operator<< for both Set and LinkedList is entirely outside of the MAIN-NAMESPACE (but within Set and LinkedList's header file).
Here's the Set version:
template<typename T>
std::ostream& operator<<(std::ostream& os,
const MAIN-NAMESPACE::POINTER-COLLECTIONS-NAMESPACE::Set<T>& set)
Now here's the problem: I have the following data structure:
Set A
Set B
Set C
double num
It's defined to be in a class within MAIN-NAMESPACE. When I create an instance of the class, and try to print one of the sets, it tells me that:
error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'const MAIN-NAMESPACE::POINTER-COLLECTIONS-NAMESPACE::Set' (or there is no acceptable conversion)
However, if I just write a main() function, and create Set A, fill it up, and use the operator- it works.
Any idea what is the problem? (note: I tried any combination of using and include I could think of).
