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C++ vector::operator>() Function

The C++ vector::operator>() function is used to test whether first vector is greater than other or not, it returns true if the vector on the left side of the operator is greater than the vector that is on the right side or else it returns false. Operator > compares element sequentially and comparison stops at first mismatch. This member function never throw an exception and the time complexity of the operator>() function is linear.

Following is the syntax for C++ vector::operator>() Function −

bool operator>(const vector<Type, Allocator>& left, const vector<Type, Allocator>& right);

• left − It indicates the vector object type that is on the left side of the operator.
• right − It indicates the vector object type that is on the right side of the operator.

Let's consider the following example, where we are going to use the opertor>() function.

#include <iostream>
#include <vector>

int main(){
   std::vector<int> myvector1{11, 22, 33};
   std::vector<int> myvector2{74, 84, 94, 104};
   std::cout << std::boolalpha;
   std::cout << "myvector1 >  myvector2 is :  " << (myvector1 > myvector2) << '\n';
}

When we compile and run the above program, this will produce the following result −

myvector1 >  myvector2 is :  false

Considering the another scenario, where we are going to take char values and comparing them.

#include <iostream>
#include <vector>

int main(){
   std::vector <char> myvector1{'W','E','L','C','O','M','E'};
   std::vector <char> myvector2{'T','P'};
   std::cout << std::boolalpha;
   std::cout << "myvector1 >  myvector2 is :  " << (myvector1 > myvector2) << '\n';
}

On running the above program, it will produce the following result −

myvector1 >  myvector2 is :  true

In the following example, we are going to push_back() function to insert the values and applying operator>() function.

#include <iostream>
#include <vector>
using namespace std;

int main(void) {
   vector<int> v1 = {1, 2, 3, 4, 5};
   vector<int> v2;
   if (v1 > v2)
      cout << "v1 is greater than v2" << endl;
   v2.push_back(1);
   v2.push_back(2);
   v2.push_back(3);
   v2.push_back(4);
   v2.push_back(6);
   if (!(v1 > v2))
      cout << "v1 is not greater than v2" << endl;
   return 0;
}

When we execute the above program, it will produce the following result −

v1 is greater than v2
v1 is not greater than v2

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