ccplusplus.com: builder pattern sample C++ code

Thursday, July 21, 2011

builder pattern sample C++ code

/*
 * builder.cpp
 * Note : code idea taken from wiki
 */
#include <string>
#include <iostream>

using namespace std;

// "Product"
class CPizza {
     public:
           void m_setDough(const string& dough) {
                m_strDough = dough;
           }
           void m_setSauce(const string& sauce) {
                m_strSauce = sauce;
           }
           void m_setTopping(const string& topping) {
                m_strTopping = topping;
           }
           void m_open() const {
                cout << "Pizza with " << m_strDough << " dough, " << m_strSauce << " sauce and " << m_strTopping << " topping. Mmm." << endl;
           }
     private:
           string m_strDough;
           string m_strSauce;
           string m_strTopping;
};

// "Abstract Builder"
class CPizzaBuilder {
     public:
           CPizza* getPizza() {
                return m_pizza;
           }
           void createNewPizzaProduct() {
                m_pizza = new CPizza;
           }
           virtual void m_buildDough() = 0;
           virtual void m_buildSauce() = 0;
           virtual void m_buildTopping() = 0;
     protected:
           CPizza* m_pizza;
};

class CHawaiianPizzaBuilder : public CPizzaBuilder {
     public:
           virtual void m_buildDough() {
                m_pizza->m_setDough("cross");
           }
           virtual void m_buildSauce() {
                m_pizza->m_setSauce("mild");
           }
           virtual void m_buildTopping() {
                m_pizza->m_setTopping("ham+pineapple");
           }
};

class SpicyPizzaBuilder : public CPizzaBuilder {
     public:
           virtual void m_buildDough() {
                m_pizza->m_setDough("pan baked");
           }
           virtual void m_buildSauce() {
                m_pizza->m_setSauce("hot");
           }
           virtual void m_buildTopping() {
                m_pizza->m_setTopping("pepperoni+salami");
           }
};

class CCook {
     public:
           void setPizzaBuilder(CPizzaBuilder* pb) {
                m_pizzaBuilder = pb;
           }
           CPizza* getPizza() {
                return m_pizzaBuilder->getPizza();
           }
           void constructPizza() {
                m_pizzaBuilder->createNewPizzaProduct();
                m_pizzaBuilder->m_buildDough();
                m_pizzaBuilder->m_buildSauce();
                m_pizzaBuilder->m_buildTopping();
           }
     private:
           CPizzaBuilder* m_pizzaBuilder;
};

int main() {
     CCook cook;
     CPizzaBuilder* hawaiianPizzaBuilder = new CHawaiianPizzaBuilder;
     CPizzaBuilder* spicyPizzaBuilder   = new SpicyPizzaBuilder;
      
     cook.setPizzaBuilder(hawaiianPizzaBuilder);
     cook.constructPizza();
      
     CPizza* hawaiian = cook.getPizza();
     hawaiian->m_open();
      
     cook.setPizzaBuilder(spicyPizzaBuilder);
     cook.constructPizza();
      
     CPizza* spicy = cook.getPizza();
     spicy->m_open();
      
     delete hawaiianPizzaBuilder;
     delete spicyPizzaBuilder;
     delete hawaiian;
     delete spicy;
    
     return 0;
}

/*
[sgupta@rhel55x86 builder]$ ./builder
Pizza with cross dough, mild sauce and ham+pineapple topping. Mmm.
Pizza with pan baked dough, hot sauce and pepperoni+salami topping. Mmm.
[sgupta@rhel55x86 builder]$
*/

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Thursday, July 21, 2011

builder pattern sample C++ code

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