ad cppprimer

C++Primer/OOP/quote.cpp

@@ -0,0 +1,31 @@
+#include "quote.h"
+
+std::string Quote::isbin() const {
+    return bookNo;
+}
+
+class Bulk_quote: public Quote {
+public:
+    Bulk_quote() = default;
+    // 遵循基类接口 通过调用基类的构造函数来初始化那些从基类中继承的对象
+    Bulk_quote(const std::string& book, double p, 
+                std::size_t qty, double disc) : 
+                Quote(book, p),  min_qty(qty), discount(disc) {}
+    double net_price(std::size_t cnt) const override {
+        if(cnt >= min_qty) {
+            return cnt * (1-discount) * price;
+        } else {
+            return cnt + price;
+        }
+    };
+private:
+    std::size_t min_qty = 0;
+    double discount = 0.0;
+};
+
+double print_total(std::ostream &os, const Quote &item, size_t n) {
+    double ret = item.net_price(n);
+    os << "ISBN: " << item.isbin()
+        << " # sold: " << n << "total due: " << ret << std::endl;
+    return ret;
+}

C++Primer/OOP/quote.h

@@ -0,0 +1,29 @@
+#include <string>
+#include <iostream>
+
+class Quote {
+public:
+    // =default 表示我们需要一个自定义的构造函数 也需要一个默认的构造函数
+    Quote() = default;
+    Quote(const std::string &book, double sales_price):
+        bookNo(book), price(sales_price) {}
+
+    std::string isbin() const;
+    // virtual double net_price(std::size_t n) const = 0;
+    virtual double net_price(std::size_t n) const {return n * price;}
+    virtual ~Quote() = default;
+private:
+    std::string bookNo;
+// 允许派生类 访问
+protected:
+    double price = 1.0;
+};
+
+// 派生类的声明 只包含类名 不包含派生列表
+class Bulk_quote;
+
+// error 不能派生
+// class Bulk_quote: public Quote;
+
+// 不想某一个类作为基类 在声明后面加上 final
+class Base final {};

C++Primer/Template/com.cpp

@@ -0,0 +1,13 @@
+#include <iostream>
+using namespace std;
+
+template<typename T>
+int compare(const T &v1, const T &v2) {
+    if (v1 > v2) return -1;
+    if (v1 < v2) return 1;
+    return 0;
+}
+
+int main() {
+
+}