add Chapter02 examples

Chapter02/README.md

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+# Chapter02
+
+This folder contains examples in C++ from second chapter. 
+
+The folder contains following examples:
+- vector_dyn_mem.cpp
+- vector_dyn_mem_reserve.cpp
+- vector_pmr.cpp
+- terminate_handler.cpp
+- new_deleted.cpp

Chapter02/new_deleted.cpp

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+#include <cstdio>
+#include <vector>
+#include <new>
+
+void *operator new(std::size_t count) = delete;
+void *operator new[](std::size_t count) = delete;
+
+void *operator new(std::size_t count, std::align_val_t al) = delete;
+void *operator new[](std::size_t count, std::align_val_t al) = delete;
+void *operator new(std::size_t count, const std::nothrow_t &tag) = delete;
+void *operator new[](std::size_t count, const  std::nothrow_t &tag) = delete;
+void *operator new(std::size_t count, std::align_val_t al, const std::nothrow_t &) = delete;
+void *operator new[](std::size_t count, std::align_val_t al, const std::nothrow_t &) = delete;
+
+int main() {
+ std::vector<int> vec;
+ vec.push_back(123);
+ printf("vec[0] = %d\r\n", vec[0]);
+ return 0;
+}
+

Chapter02/terminate_handler.cpp

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+#include <array>
+#include <cstdio>
+#include <cstdlib>
+#include <exception>
+
+int main() {
+  constexpr auto my_terminate_handler = []() {
+    printf("This is my_terminate_handler\r\n");
+    std::abort();
+  };
+
+  std::set_terminate(my_terminate_handler);
+
+  std::array<int, 4> arr;
+  for (int i = 0; i < 5; i++) {
+    arr.at(i) = i;
+  }
+
+  return 0;
+}

Chapter02/vector_dyn_mem.cpp

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+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <vector>
+
+void *operator new(std::size_t count) {
+  printf("%s, size = %ld\r\n", __PRETTY_FUNCTION__, count);
+  return std::malloc(count);
+}
+
+void operator delete(void *ptr) noexcept {
+  printf("%s\r\n", __PRETTY_FUNCTION__);
+  std::free(ptr);
+}
+
+int main() {
+  std::vector<std::uint8_t> vec;
+  constexpr std::size_t n_elem = 8;
+  for (std::uint8_t i = 0; i < n_elem; i++) {
+    vec.push_back(i);
+  }
+  const auto print_array = [](uint8_t *arr, std::size_t n) {
+    for (std::size_t i = 0; i < n; i++) {
+      printf("%d ", arr[i]);
+    }
+    printf("\r\n");
+  };
+  print_array(vec.data(), n_elem);
+  return 0;
+}

Chapter02/vector_dyn_mem_reserve.cpp

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+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <vector>
+
+void *operator new(std::size_t count) {
+  printf("%s, size = %ld\r\n", __PRETTY_FUNCTION__, count);
+  return std::malloc(count);
+}
+
+void operator delete(void *ptr) noexcept {
+  printf("%s\r\n", __PRETTY_FUNCTION__);
+  std::free(ptr);
+}
+
+int main() {
+  std::vector<std::uint8_t> vec;
+  constexpr std::size_t n_elem = 8;
+
+  vec.reserve(n_elem);
+
+  for (std::uint8_t i = 0; i < n_elem; i++) {
+    vec.push_back(i);
+  }
+  const auto print_array = [](uint8_t *arr, std::size_t n) {
+    for (std::size_t i = 0; i < n; i++) {
+      printf("%d ", arr[i]);
+    }
+    printf("\r\n");
+  };
+  print_array(vec.data(), n_elem);
+  return 0;
+}

Chapter02/vector_pmr.cpp

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+#include <array>
+#include <cstdio>
+#include <cstdlib>
+#include <memory_resource>
+#include <new>
+#include <vector>
+
+void *operator new(std::size_t count, std::align_val_t al) {
+  printf("%s, size = %ld\r\n", __PRETTY_FUNCTION__, count);
+  return std::malloc(count);
+}
+
+int main() {
+  using namespace std;
+  using namespace std::pmr;
+
+  constexpr size_t n_elem = 8;
+  array<uint8_t, sizeof(uint8_t) * 8> buffer{0};
+  monotonic_buffer_resource mbr{buffer.data(), buffer.size()};
+  polymorphic_allocator<uint8_t> pa{&mbr};
+  std::pmr::vector<uint8_t> vec{pa};
+  // vec.reserve(n_elem);
+  //
+  for (uint8_t i = 0; i < n_elem; i++) {
+    vec.push_back(i);
+  }
+
+  for (uint8_t data : buffer) {
+    printf("%d ", data);
+  }
+  printf("\r\n");
+
+  return 0;
+}