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G19_Extensive_Hierarchy.cpp
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G19_Extensive_Hierarchy.cpp
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/**************************************************************************************************
*
* \file G19_Extensive_Hierarchy.cpp
* \brief Guideline 19: Use Strategy to Isolate How Things are Done
*
* Copyright (C) 2022 Klaus Iglberger - All Rights Reserved
*
* This file is part of the supplemental material for the O'Reilly book "C++ Software Design"
* (https://www.oreilly.com/library/view/c-software-design/9781098113155/).
*
**************************************************************************************************/
//---- <Point.h> ----------------------------------------------------------------------------------
struct Point
{
double x;
double y;
};
//---- <Shape.h> ----------------------------------------------------------------------------------
class Shape
{
public:
virtual ~Shape() = default;
virtual void draw( /*some arguments*/ ) const = 0;
};
//---- <Circle.h> ---------------------------------------------------------------------------------
//#include <Point.h>
//#include <Shape.h>
class Circle : public Shape
{
public:
explicit Circle( double radius )
: radius_( radius )
{
/* Checking that the given radius is valid */
}
double radius() const { return radius_; }
Point center() const { return center_; }
// ... No implementation of the draw() member function anymore
private:
double radius_;
Point center_{};
};
//---- <OpenGLCircle.h> ---------------------------------------------------------------------------
//#include <Circle.h>
class OpenGLCircle : public Circle
{
public:
explicit OpenGLCircle( double radius )
: Circle( radius )
{}
void draw( /*some arguments*/ ) const override;
};
//---- <OpenGLCircle.cpp> ----------------
//#include <OpenGLCircle.h>
//#include /* OpenGL graphics library headers */
void OpenGLCircle::draw( /*some arguments*/ ) const
{
// ... Implementing the logic for drawing a circle by means of OpenGL
}
//---- <Square.h> ---------------------------------------------------------------------------------
//#include <Point.h>
//#include <Shape.h>
class Square : public Shape
{
public:
explicit Square( double side )
: side_( side )
{
/* Checking that the given side length is valid */
}
double side () const { return side_; }
Point center() const { return center_; }
// ... No implementation of the draw() member function anymore
private:
double side_;
Point center_{};
};
//---- <OpenGLSquare.h> ----------------
//#include <Square.h>
class OpenGLSquare : public Square
{
public:
explicit OpenGLSquare( double side )
: Square( side )
{}
void draw( /*some arguments*/ ) const override;
};
//---- <OpenGLSquare.cpp> ----------------
//#include <OpenGLSquare.h>
//#include /* OpenGL graphics library headers */
void OpenGLSquare::draw( /*some arguments*/ ) const
{
// ... Implementing the logic for drawing a square by means of OpenGL
}
//---- <DrawAllShapes.h> --------------------------------------------------------------------------
#include <memory>
#include <vector>
class Shape;
void drawAllShapes( std::vector<std::unique_ptr<Shape>> const& shapes );
//---- <DrawAllShapes.cpp> ------------------------------------------------------------------------
//#include <DrawAllShapes.h>
//#include <Shape.h>
void drawAllShapes( std::vector<std::unique_ptr<Shape>> const& shapes )
{
for( auto const& shape : shapes )
{
shape->draw( /*some arguments*/ );
}
}
//---- <Main.cpp> ---------------------------------------------------------------------------------
//#include <OpenGLCircle.h>
//#include <OpenGLSquare.h>
//#include <DrawAllShapes.h>
#include <cstdlib>
#include <memory>
#include <vector>
int main()
{
using Shapes = std::vector< std::unique_ptr<Shape> >;
Shapes shapes{};
// Creating some shapes
shapes.emplace_back( std::make_unique<OpenGLCircle>( 2.3 ) );
shapes.emplace_back( std::make_unique<OpenGLSquare>( 1.2 ) );
shapes.emplace_back( std::make_unique<OpenGLCircle>( 4.1 ) );
// Drawing all shapes
drawAllShapes( shapes );
return EXIT_SUCCESS;
}