In C++Write a class, named "TwoOrLess" with a header file (two_or_less.hpp) and an implementation file (two_or_less.cpp).This is a class that acts much like a set, except it can hold 0, 1, or 2 duplicates of an int. You need to support the insert, count, and size methods with the same parameters and return types as the set<int> class (see test cases). ### Code Sample```cpp#include "two_or_less.hpp"TwoOrLess thing;ASSERT_EQ(thing.size(), 0);thing.insert(0);ASSERT_EQ(thing.size(), 1);```### Your Code's Output```plaintextfrom /usr/include/gmock/internal/gmock-internal-utils.h:47,from /usr/include/gmock/gmock-actions.h:51,from /usr/include/gmock/gmock.h:59,from cpp_unit_test:0:cpp_unit_test:3:11: error: ‘thing’ was not declared in this scopeASSERT_EQ(thing.size(), 0);^~~~~cpp_unit_test:3:11: note: suggested alternative: ‘this’cpp_unit_test:4:1: error: ‘thing’ was not declared in this scopething.insert(0);^~~~~cpp_unit_test:4:1: note: suggested alternative: ‘this’CMakeFiles/runTests.dir/build.make:62: recipe for target 'CMakeFiles/runTests.dir/tests.cpp.o' failedmake[2]: *** [CMakeFiles/runTests.dir/tests.cpp.o] Error 1```### ExplanationThe code attempts to include and use a class or header called `TwoOrLess` from the `two_or_less.hpp` file. This snippet is supposed to perform unit tests using Google Mock, indicated by the `ASSERT_EQ` checks.**Errors Identified:**1. **Undeclared Variable:** - The error message `‘thing’ was not declared in this scope` indicates a missing declaration or inclusion issue. The compiler suggests the alternative `‘this’`, which is not relevant in this context.2. **Build Error:** - The build is terminated with an error in the CMake process, implying that the compilation of `tests.cpp.o` failed due to the unresolved issues in the above code.### Recommendations for Resolution:- **Ensure `TwoOrLess` is Defined:** - Verify that the `two_or_less.hpp` file is correctly included and that it defines the `TwoOrLess` class.- **Check for Typos:** - Confirm there are no syntax errors or typographical mistakes around the `TwoOrLess` and `thing` declarations.- **Linking with Google Mock:** - Ensure that Google Mock (GMock) is properly linked and installed in the environment since `ASSERT ### C++ Code Example: "TwoOrLess" Class Test**Code:**```cpp#include "two_or_less.hpp"TwoOrLess thing;ASSERT_EQ(thing.size(), 0);ASSERT_EQ(thing.count(0), 0);thing.insert(0);ASSERT_EQ(thing.size(), 1);ASSERT_EQ(thing.count(0), 1);thing.insert(1);ASSERT_EQ(thing.size(), 2);ASSERT_EQ(thing.count(1), 1);ASSERT_EQ(thing.count(0), 1);thing.insert(0);ASSERT_EQ(thing.size(), 2);```**Output:**```cpp_unit_test:3:11: error: ‘thing’ was not declared in this scope ASSERT_EQ(thing.size(), 0); ^~~~cpp_unit_test:3:11: note: suggested alternative: ‘this’cpp_unit_test:4:11: error: ‘thing’ was not declared in this scope ASSERT_EQ(thing.count(0), 0); ^~~~cpp_unit_test:4:11: note: suggested alternative: ‘this’cpp_unit_test:6:1: error: ‘thing’ was not declared in this scope thing.insert(0); ^~~~cpp_unit_test:6:1: note: suggested alternative: ‘this’```### ExplanationThis code attempts to utilize a class or struct named `TwoOrLess`, performing several operations to test its functionality:1. **Initialization and Assertion:** - The `TwoOrLess` object, `thing`, is created but not defined in the scope, leading to compilation errors. - `ASSERT_EQ` is used to check if the `size()` and `count()` functions return expected values.2. **Insertion and Verification:** - The code attempts to insert elements into `thing` and verify its `size` and `count` after each operation.3. **Errors Encountered:** - The main issue is the undeclared identifier `thing`, suggesting a lack of appropriate definition or inclusion of necessary header files. - The error messages suggest replacing `thing` with `this`, which is inappropriate in this context but hints at scope issues.### Troubleshooting StepsTo resolve these errors, consider the following steps:- **Include Proper Headers:** Ensure that the `two_or_less.hpp` file is correctly included and

TwoOrLestt.cpp #include "TwoOrLess.h" void TwoOrLess::insert(int x) {if(st.count(x) < 2) st.insert(x);} int TwoOrLess::size() { return st.size();} int TwoOrLess::count(int x) {return st.count(x);}int main(){ TwoOrLess *t = new TwoOrLess() ;t->insert(5); t->insert(3);t->insert(5); t->insert(1);cout<<" count 5 are " << t->count(5)<<endl;cout<<" count 3 are " << t->count(3)<<endl; cout<<"the whole size is " <<t->size();}TwoOrLess.h #pragma once#include <set>class TwoOrLess{public:// TwoOrLess();// ~TwoOrLess();void insert(int x);int size();int count(int x);private:std::multiset<int> st;};