Description
Create and test a class called Points2D. This class describes a sequence of 2D points. For
example (1, 3), (4, 5) is a sequence of two points, where each coordinate is an integer. (1.2,
3.4), (5.6, 10.1), (11.1, 12.0) is a sequence of three points where each coordinate is a double. A
sequence can have any size. An empty sequence has size 0.
The purpose of this assignment is to have you create a Points2D class from scratch with limited
help from the STL. Since Points2D can have arbitrary size, you should use pointers. The private
data members should be:
size_t size; std::array<Object, 2> *sequence_;
Object is the template type parameter (i.e int, double, etc.). An initial piece of code with the
structure of the class is provided. Do not change the data representation (for instance do not use a
vector or list to represent the sequence_).
Pay special attention to Weiss’s “big five”, the destructor, copy constructor, copy assignment
operator, move constructor and move assignment operator.
Included are the two files (points2d.h, test_points2d.cc) you will need, as well as the Makefile.
Do not modify the Makefile or the file names. Do not modify the test_points2d.cc file except by
changing or adding include files if needed. You can comment in the main file the parts you
didn’t complete. The points2d.h file is not complete. In the file it is explained where to provide
changes. I am also providing you with a sample input file test_input_file.txt and I am
explaining how to use it at the end of this document.
This assignment will help you revisit constructors, destructors, overloading of operators, and
templates. Follow a consistent C++ coding style, for instance
https://google.github.io/styleguide/cppguide.html
PART 1 [70 points]
Implement the “big five”. Add the output stream << operator.
Demonstrate that you are able to read and write correctly by including the following code in the
main file. The code is already provided for you in the main file. You can comment parts of it as
you are testing your implementation. For full credit all functions should work.
void TestPart1() {
Points2D a, b; // Two empty Points2D are created.
cout << a.size() << ” ” << b.size() << endl; // yields 0 0.
const array<int, 2> a_point2{{7, 10}};
Points2D d{a_point2}; // Sequence (7, 10) should be created.
cout << d; // Should just print (7, 10)
cout << “Enter a sequence of points (integer)” << endl;
a.ReadPoints2D(); // User enters a set of points in the form:
// 3 7 4 3 2 1 10
// 3 specifies number of points. Points are the pairs
// (7, 4) (3, 2) and (1, 10)
cout << “Output1: ” << endl;
cout << a; // Output should be what user entered.
cout << “Enter a sequence of points (integer)” << endl;
b.ReadPoints2D(); // Enter another sequence.
cout << “Output2: ” << endl;
cout << b;
Points2D c{a}; // Calls copy constructor for c.
cout << “After copy constructor1 c{a}: ” << endl;
cout << c;
cout << a;
a = b; // Should call the copy assignment operator for a.
cout << “After assignment a = b” << endl;
cout << a;
Points2D e = move(c); // Move constructor for d.
cout << “After e = move(c) ” << endl;
cout << e;
cout << c;
cout << “After a = move(e) ” << endl;
a = move(e); // Move assignment operator for a.
cout << a;
cout << e;
}
PART 2 [30 points]
Overload the + and [] operators for your Points2D class. Test with the following code. The code
is already provided for you in the main file. You can comment parts of it as you are testing your
implementation. For full credit all functions should work.
void TestPart2() {
Points2D a, b;
cout << “Enter a sequence of points (double)” << endl;
a.ReadPoints2D(); // User provides input for Points2D a.
cout << a;
cout << “Enter a sequence of points (double)” << endl;
b.ReadPoints2D(); // User provides input for Points2D b.
cout << b << endl;
cout << “Result of a + b” << endl;
cout << a + b << endl;
Points2D d = a + b;
cout << “Result of d = a + b” << endl;
cout << d;
cout << “Second element in a: ” << endl;
cout << a[1][0] << “, ” << a[1][1] << endl; // Should print the 2nd
element.
} // End of TestPart2
Do not send to the standard output anything else other what is asked. Do not pause for input, or
interact with the user.
You can run the program as follows:
./test_points2d
In that case you should enter the required data in the standard input.
You can also run it as follows
./test_points2d < test_input_file.txt
In that case the output should be the one contained in expected_output.txt
Note that the code for test_points2 is the same in both cases. In the second
call the shell redirects the contents of test_input_file.txt to the standard
input.
Deliverables to upload to gradescope for Assignment 1:
• Submit your modified points2d.h
• Submit single README.txt file where you state what you have completed for each
question.
