ERROR: no match for 'operator<<" in 'std::cout

Question

I realize this error is usually due to some syntax or type issues but I am not sure how to solve this problem. I think it may do with the type of findRt.

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Answer 1

You'll have to create an overloaded version of operator<< for std::cout. It would look something like the following:

ostream& operator<<(ostream& out, const vector& triangles);

and at the end of the function, you simply do a return out; in order to return the std::ostream object out that was passed as the first argument (in your case that will be std::cout).

In other words, when you do

MyFoo object;
std::cout << object;

this is "syntactic sugar" for the following function call:

MyFoo object;
operator<<(std::cout, object);

and would call a version of operator<< that looked like:

ostream& operator<<(ostream& out, const MyFoo& my_object);

If the above function was not defined, then you'd get an error like you're currently experiencing.