17.8) Class Implementation File

Assuming that the definition of the Rectangle class is in a file called rect.hpp, the corresponding method implementations can go in a file called rect.cpp that looks like this:

#include "rect.hpp"
Rectangle::Rectangle(int x, int y, int w, int h)
{
  corner_x = x;
  corner_y = y;
  width = w;
  height = h;
}
int Rectangle::get_x()
{
  return corner_x;
}
...

Key Points

The names of all methods in the implementation file (including the constructor) are prefixed with the class name and two colons
The constructor does not have a return type!
The constructor would normally do some validation of the parameters – which we omit here

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