CS 330 Lecture 22 – Custom types in C++
March 28, 2012 by Chris Johnson. Filed under
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cs330, lectures, spring 2012.
Agenda
- a gdb primer
- object-oriented programming
- classes
- inheritance
- polymorphism
- control abstraction vs. data abstraction
- writing a matrix class and a vector class
- overloading [], (), *, and <<
- generic code through templates
TODO
Code
Vector.h
#ifndef VECTOR_H
#define VECTOR_H
class Vector2 {
public:
Vector2();
Vector2(float x, float y);
// write a subscript operator
float& operator[](int index);
Vector2 operator+(const Vector2& other);
// overload a print operator
private:
float x;
float y;
};
#endif
Vector.cpp
#include <cassert>
#include "Vector.h"
Vector2::Vector2() :
x(0.0f),
y(0.0f) {
}
Vector2::Vector2(float x, float y) :
x(x),
y(y) {
}
float& Vector2::operator[](int index) {
assert(index >= 0 && index <= 1);
return index == 0 ? x : y;
}
Vector2 Vector2::operator+(const Vector2& other) {
return Vector2(x + other.x, y + other.y);
}
/* ------------------------------------------------------------------------- */
drawer.cpp
#include <iostream>
#include "Vector.h"
int main() {
Vector2 point(10.0f, 15.0f);
Vector2 point2(1.0f, 2.0f);
Vector2 sum = point + point2;
std::cout << "sum[0]: " << sum[0] << std::endl;
std::cout << "sum[1]: " << sum[1] << std::endl;
std::cout << "point[0]: " << point[0] << std::endl;
std::cout << "point[1]: " << point[1] << std::endl;
point[0] = 11.0f;
std::cout << "point[0]: " << point[0] << std::endl;
std::cout << "point[1]: " << point[1] << std::endl;
/* point[0] // point.getX() */
/* point[1] // point.getY() */
}
Haiku
Types grow a language.
Without changing its grammar.
And C++ lives.