From 7060e656ad6e052fc19553723a1e39b9ed0b0f6c Mon Sep 17 00:00:00 2001
From: Charles Ellis <hamled@hamled.name>
Date: Fri, 1 Nov 2019 17:32:01 -0700
Subject: [PATCH] Chapter 3 vector and container class code

---
 ch03/container.hpp        | 11 +++++++++++
 ch03/use.cpp              | 22 ++++++++++++++++++++++
 ch03/vector.cpp           |  9 +++++++++
 ch03/vector.hpp           | 28 ++++++++++++++++++++++++++++
 ch03/vector_container.hpp | 20 ++++++++++++++++++++
 5 files changed, 90 insertions(+)
 create mode 100644 ch03/container.hpp
 create mode 100644 ch03/use.cpp
 create mode 100644 ch03/vector.cpp
 create mode 100644 ch03/vector.hpp
 create mode 100644 ch03/vector_container.hpp

diff --git a/ch03/container.hpp b/ch03/container.hpp
new file mode 100644
index 0000000..c2c0a93
--- /dev/null
+++ b/ch03/container.hpp
@@ -0,0 +1,11 @@
+#ifndef __CONTAINER_H__
+#define __CONTAINER_H__
+
+class Container {
+public:
+  virtual double& operator[](int) = 0;
+  virtual int size() const = 0;
+  virtual ~Container() {};
+};
+
+#endif //__CONTAINER_H__
diff --git a/ch03/use.cpp b/ch03/use.cpp
new file mode 100644
index 0000000..f8167e7
--- /dev/null
+++ b/ch03/use.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+
+#include "container.hpp"
+#include "vector_container.hpp"
+
+void use(Container& c) {
+  const int sz = c.size();
+
+  for(int i = 0; i != sz; ++i) {
+    std::cout << c[i] << '\n';
+  }
+}
+
+void g() {
+  Vector_container vc{10,9,8,7,6,5,4,3,2,1,0};
+
+  use(vc);
+}
+
+int main() {
+  g();
+}
diff --git a/ch03/vector.cpp b/ch03/vector.cpp
new file mode 100644
index 0000000..fe8d9d7
--- /dev/null
+++ b/ch03/vector.cpp
@@ -0,0 +1,9 @@
+#include "vector.hpp"
+
+double& Vector::operator[](int i) {
+  return elem[i];
+}
+
+int Vector::size() const {
+  return sz;
+}
diff --git a/ch03/vector.hpp b/ch03/vector.hpp
new file mode 100644
index 0000000..5527f83
--- /dev/null
+++ b/ch03/vector.hpp
@@ -0,0 +1,28 @@
+#ifndef __VECTOR_H__
+#define __VECTOR_H__
+
+#include <initializer_list>
+#include <algorithm>
+
+class Vector {
+private:
+  double* elem;
+  int sz;
+
+public:
+  Vector(int s) : elem{new double[s]}, sz{s} {
+    for(int i = 0; i != s; ++i) elem[i] = 0;
+  }
+
+  Vector(std::initializer_list<double> lst)
+      : elem{new double[lst.size()]}, sz{static_cast<int>(lst.size())} {
+    std::copy(lst.begin(), lst.end(), elem);
+  }
+
+  ~Vector() { delete[] elem; }
+
+  double& operator[](int i);
+  int size() const;
+};
+
+#endif //__VECTOR_H__
diff --git a/ch03/vector_container.hpp b/ch03/vector_container.hpp
new file mode 100644
index 0000000..1cf1527
--- /dev/null
+++ b/ch03/vector_container.hpp
@@ -0,0 +1,20 @@
+#ifndef __VECTOR_CONTAINER_H__
+#define __VECTOR_CONTAINER_H__
+
+#include <initializer_list>
+
+#include "container.hpp"
+#include "vector.hpp"
+
+class Vector_container : public Container {
+  Vector v;
+public:
+  Vector_container(int s) : v(s) {}
+  Vector_container(std::initializer_list<double> lst) : v(lst) {}
+  ~Vector_container() {}
+
+  double& operator[](int i) { return v[i]; }
+  int size() const { return v.size(); }
+};
+
+#endif //__VECTOR_CONTAINER_H__