added 15.4

doesn't finish.

ch15/README.md

@@ -117,3 +117,14 @@ derived dobj; base *bp2 = &dobj; base &br2 = dobj;
 ```
 
 e and f are called at run time.
+
+## Exercise 15.15:
+> Define your own versions of `Disc_quote` and `Bulk_quote`.
+
+[Disc_quote](ex15_15_Disc_quote.h) | [Bulk_quote](ex15_15_Bulk_quote.h)
+
+## Exercise 15.16:
+> Rewrite the class representing a limited discount strategy, which you wrote for the exercises in 15.2.2 (p. 601), to inherit from `Disc_quote`.
+
+## Exercise 15.17:
+> Try to define an object of type Disc_quote and see what errors you get from the compiler.

ch15/TEST.cpp

@@ -27,4 +27,9 @@ int main()
     quote_11.debug();
     bulk_quote_11.debug();
     limit_quote_11.debug();
+
+    cout << "\n===== ex15 =====" << endl;
+
+    EX15::Bulk_quote bulk_quote_15("0-201-82470-1", 50, 5, .19);
+    EX03::print_total(std::cout, bulk_quote_15, 6);
 }

ch15/ch15.h

@@ -23,6 +23,8 @@ namespace ch15 {
 #include "ex15_11_Quote.h"
 #include "ex15_11_Bulk_quote.h"
 #include "ex15_11_Limit_quote.h"
+#include "ex15_15_Disc_quote.h"
+#include "ex15_15_Bulk_quote.h"
 }
 
 #endif // CH15_H_

ch15/ex15_11_Limit_quote.h

@@ -27,7 +27,7 @@ class Limit_quote : public Bulk_quote {
     Limit_quote() = default;
     Limit_quote(string const& book, double p, size_t min, size_t max, double dist) : Bulk_quote(book, p, min, dist), max_qty(max) {}
 
-    double net_price(size_t cnt) const override {
+    double net_price(size_t cnt) const final override {
         if (cnt > max_qty) return max_qty * (1 - discount) * price + (cnt - max_qty) * price;
         else if (cnt >= min_qty) return cnt * (1 - discount) * price;
         else return cnt * price;

ch15/ex15_15_Bulk_quote.h

@@ -0,0 +1,36 @@
+/*
+=================================================================================
+
+C++ Primer 5th Exercise Answer Source Code
+Copyright (C) 2014-2015 github.com/pezy/Cpp-Primer
+
+Disc_quote
+
+If you have questions, try to connect with me: pezy<[email protected]>
+
+=================================================================================
+*/
+
+#ifndef CP5_EX15_15_BULK_QUOTE_H_
+#define CP5_EX15_15_BULK_QUOTE_H_
+
+#include "ex15_15_Disc_quote.h"
+#include <string>
+
+inline namespace EX15 {
+
+    using std::string;
+
+class Bulk_quote : public Disc_quote {
+public:
+    Bulk_quote() = default;
+    Bulk_quote(string const& book, double price, size_t qty, double disc) : Disc_quote(book, price, qty, disc) { }
+    virtual double net_price(std::size_t cnt) const override {
+        if (cnt >= quantity) return cnt * (1 - discount) * price;
+        else return cnt * price;
+    }
+};
+
+}
+
+#endif // CP5_EX15_15_BULK_QUOTE_H_

ch15/ex15_15_Disc_quote.h

@@ -0,0 +1,36 @@
+/*
+=================================================================================
+
+C++ Primer 5th Exercise Answer Source Code
+Copyright (C) 2014-2015 github.com/pezy/Cpp-Primer
+
+Disc_quote
+
+If you have questions, try to connect with me: pezy<[email protected]>
+
+=================================================================================
+*/
+
+#ifndef CP5_EX15_15_DISC_QUOTE_H_
+#define CP5_EX15_15_DISC_QUOTE_H_
+
+#include "ex15_03_Quote.h"
+#include <string>
+
+inline namespace EX15 {
+
+    using std::string;
+
+class Disc_quote : public EX03::Quote {
+public:
+    Disc_quote() = default;
+    Disc_quote(string const& b, double p, size_t q, double d) : EX03::Quote(b, p), quantity(q), discount(d){ }
+    virtual double net_price(size_t) const = 0;
+protected:
+    size_t quantity = 0;
+    double discount = 0.0;
+};
+
+}
+
+#endif // CP5_EX15_15_DISC_QUOTE_H_

ch15/ex15_15_Limit_quote.h

@@ -0,0 +1,46 @@
+/*
+=================================================================================
+
+C++ Primer 5th Exercise Answer Source Code
+Copyright (C) 2014-2015 github.com/pezy/Cpp-Primer
+
+Limit_quote class
+added debug function
+
+If you have questions, try to connect with me: pezy<[email protected]>
+
+=================================================================================
+*/
+
+#ifndef CP5_EX15_15_LIMIT_QUOTE_H_
+#define CP5_EX15_15_LIMIT_QUOTE_H_
+
+#include "ex15_15_Bulk_quote.h"
+#include <string>
+
+namespace EX15 {
+    using std::string;
+    using std::cout; using std::endl;
+
+class Limit_quote : public Bulk_quote {
+public:
+    Limit_quote() = default;
+    Limit_quote(string const& book, double p, size_t min, size_t max, double dist) : Bulk_quote(book, p, min, dist), max_qty(max) {}
+
+    double net_price(size_t cnt) const final override {
+        if (cnt > max_qty) return max_qty * (1 - discount) * price + (cnt - max_qty) * price;
+        else if (cnt >= min_qty) return cnt * (1 - discount) * price;
+        else return cnt * price;
+    }
+
+    virtual void debug() const final {
+        Bulk_quote::debug();
+        cout << "\tmax_qty: " << max_qty << endl;
+    }
+
+private:
+    size_t max_qty = 0;
+};
+}
+
+#endif // CP5_EX15_15_LIMIT_QUOTE_H_