From df2480c73c881d3ecefb3cd05d80fa14b2c49e5e Mon Sep 17 00:00:00 2001
From: Youwen Wu <youwenw@gmail.com>
Date: Fri, 14 Feb 2025 01:05:55 -0800
Subject: [PATCH] feat: complete chapter 6 lab 6

---
 meson.build                       |  2 +
 src/chapter_6/lab-6/IntVector.cpp | 33 +++++++++++++++
 src/chapter_6/lab-6/IntVector.h   | 18 ++++++++
 src/chapter_6/lab-6/main.cpp      | 68 +++++++++++++++++++++++++++++++
 4 files changed, 121 insertions(+)
 create mode 100644 src/chapter_6/lab-6/IntVector.cpp
 create mode 100644 src/chapter_6/lab-6/IntVector.h
 create mode 100644 src/chapter_6/lab-6/main.cpp

diff --git a/meson.build b/meson.build
index 0e6b036..4339f9c 100644
--- a/meson.build
+++ b/meson.build
@@ -44,3 +44,5 @@ c_5_lab_5_1 = executable(
   ['src/chapter_5/lab_5-1/main.cpp'],
   install: true,
 )
+
+c_6_lab_6 = executable('c_6_lab-6', ['src/chapter_6/lab-6/main.cpp', 'src/chapter_6/lab-6/IntVector.h', 'src/chapter_6/lab-6/IntVector.cpp'], install: true)
diff --git a/src/chapter_6/lab-6/IntVector.cpp b/src/chapter_6/lab-6/IntVector.cpp
new file mode 100644
index 0000000..3f07aeb
--- /dev/null
+++ b/src/chapter_6/lab-6/IntVector.cpp
@@ -0,0 +1,33 @@
+#include "IntVector.h"
+#include <stdexcept>
+using namespace std;
+
+IntVector::IntVector(unsigned capacity, int value) {
+  __size = capacity;
+  __capacity = capacity;
+
+  if (__size > 0) {
+    __data = new int[__size];
+  } else {
+    __data = nullptr;
+  }
+
+  for (unsigned i = 0; i < __size; i++) {
+    __data[i] = value;
+  }
+}
+
+IntVector::~IntVector() { delete[] __data; }
+
+const int &IntVector::at(unsigned index) const {
+  if (index >= __size)
+    throw out_of_range("IntVector::at_range_check");
+
+  return __data[index];
+}
+
+unsigned IntVector::size() const { return __size; }
+unsigned IntVector::capacity() const { return __capacity; };
+bool IntVector::empty() const { return __size == 0; };
+const int &IntVector::front() const { return __data[0]; }
+const int &IntVector::back() const { return __data[__size - 1]; }
diff --git a/src/chapter_6/lab-6/IntVector.h b/src/chapter_6/lab-6/IntVector.h
new file mode 100644
index 0000000..20d97e0
--- /dev/null
+++ b/src/chapter_6/lab-6/IntVector.h
@@ -0,0 +1,18 @@
+#pragma once
+
+class IntVector {
+public:
+  IntVector(unsigned capacity = 0, int value = 0);
+  ~IntVector();
+  unsigned size() const;
+  unsigned capacity() const;
+  bool empty() const;
+  const int &at(unsigned index) const;
+  const int &front() const;
+  const int &back() const;
+
+private:
+  unsigned __size;
+  unsigned __capacity;
+  int *__data;
+};
diff --git a/src/chapter_6/lab-6/main.cpp b/src/chapter_6/lab-6/main.cpp
new file mode 100644
index 0000000..92dd847
--- /dev/null
+++ b/src/chapter_6/lab-6/main.cpp
@@ -0,0 +1,68 @@
+#include "IntVector.h"
+#include <cassert>
+#include <iostream>
+#include <stdexcept>
+using namespace std;
+
+int main() {
+  cout << "Running test bench!" << endl;
+
+  IntVector *testVec = nullptr;
+
+  testVec = new IntVector();
+  assert(testVec->empty());
+  cout << "[SUCCESS] empty() works as expected for empty vector." << endl;
+  assert(testVec->size() == 0);
+  assert(testVec->capacity() == 0);
+  cout << "[SUCCESS] Default constructor sets size and capacity properly."
+       << endl;
+
+  testVec = new IntVector(1);
+  assert(!testVec->empty());
+  cout << "[SUCCESS] empty() works as expected for nonempty vector." << endl;
+  assert(testVec->at(0) == 0);
+  cout << "[SUCCESS] Basic vector initialization works." << endl;
+
+  for (unsigned i = 0; i < 100; i++) {
+    testVec = new IntVector(i, 50 - i);
+
+    assert(testVec->capacity() == i);
+    assert(testVec->size() == i);
+
+    for (unsigned j = 0; j < testVec->size(); j++) {
+      assert(testVec->at(j) == 50 - static_cast<int>(i));
+    }
+  }
+
+  cout << "[SUCCESS] Size and capacity work as expected" << endl;
+  cout << "[SUCCESS] Initializing values getting values at indices work."
+       << endl;
+
+  testVec = new IntVector(5, 2);
+
+  bool failed = false;
+  try {
+    testVec->at(5);
+  } catch (const out_of_range &e) {
+    failed = true;
+  }
+  assert(failed);
+  cout << "[SUCCESS] at() correctly throws for out of range access." << endl;
+
+  assert((testVec->front() == testVec->at(0)));
+  cout << "[SUCCESS] Output of front() is consistent with output of at(0)."
+       << endl;
+
+  assert(testVec->front() == 2);
+  cout << "[SUCCESS] Output of front() is correct." << endl;
+
+  assert((testVec->back() == testVec->at(testVec->size() - 1)));
+  cout
+      << "[SUCCESS] Output of back() is consistent with output of at(size - 1)."
+      << endl;
+
+  assert(testVec->front() == 2);
+  cout << "[SUCCESS] Output of back() is correct." << endl;
+
+  cout << "All tests passed!" << endl;
+}