Question

How to compare two vectors | std::equal() & Comparators

Answer 1

std::vector provides an equality comparison operator==, it can be used to compare the contents of two vectors. For each element in the vector it will call operator == on the elements for comparisons.
Let’s see how to do that,

Suppose we have 2 vectors of int i.e.

1 2	std::vector<int> vecOfNums1{ 1, 4, 5, 22, 33, 2, 11, 89, 49 }; std::vector<int> vecOfNums2{ 1, 4, 5, 22, 33, 2, 11, 89, 49 };

Let’s compare 2 vector using operator == i.e.

4 5 6 7

/* * Comparing vectors using operator == */ if (vecOfNums1 == vecOfNums2) { std::cout << "matched" << std::endl; }

If contents of vectors are equal than it will return true else false.