how to compare two std::set?

Question

I do such comparison of two std::set

#include 
#include 
using namespace std;

#include 
#include 

        

Answer 1

C++11 standard on == for std::set

Others have mentioned that operator== does compare std::set contents and works, but here is a quote from the C++11 N3337 standard draft which I believe implies that.

The quote is exactly the same as that for std::vector which I have interpreted in full detail at: C++: Comparing two vectors

As a short summary to avoid duplication with that other answer:

• 23.2.1 "General container requirements" states that all containers use equal() for operator==
• 25.2.11 "Equal" defines equal and explicitly shows that it iterates over both containers comparing the elements of each