第2版のサンプルコードを追加

Author: faithandbrave

2nd/003_exception/001_about.cpp

@@ -0,0 +1,35 @@
+// Copyright (c) 2012-2013
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+#include <iostream>
+#include <stdexcept>
+
+using namespace std;
+
+void g() {
+  throw runtime_error("エラーが発生した！");
+}
+
+void f() {
+  try {
+    g();
+  }
+  catch (runtime_error& e) { // 関数f()で送出された例外を捕捉
+    cerr << e.what() << endl; // エラーメッセージを取得
+    throw; // 捕捉した例外を再送出
+  }
+  // exceptionクラスを継承したすべての例外オブジェクトを捕捉
+  catch (exception& e) {
+    cerr << "exceptionを継承した例外オブジェクトが送出された" << endl;
+  }
+  // あらゆる例外を捕捉
+  catch (...) {
+    cerr << "何かの例外オブジェクトが送出された" << endl;
+  }
+}
+
+int main() {
+  f();
+}
+

2nd/003_exception/002_exception.cpp

@@ -0,0 +1,28 @@
+// Copyright (c) 2012-2013
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+#include <iostream>
+#include <stdexcept>
+
+using namespace std;
+
+void f(int i) {
+  const int size = 3;
+  int ar[size];
+
+  if (i < 0 || i >= size) {
+    throw out_of_range("範囲外の値が渡されました");
+  }
+}
+
+int main() {
+  try {
+    f(5);
+  }
+  catch (out_of_range& e) {
+    const char* message = e.what();
+    cerr << message << endl;
+//  throw;
+  }
+}

2nd/003_exception/003_noexcept.cpp

@@ -0,0 +1,26 @@
+// Copyright (c) 2012-2013
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+class Item {
+  int id = 0;
+public:
+  int getId() const noexcept {
+    return id;
+  }
+};
+
+int getItemId(const Item& item)
+              noexcept(noexcept(item.getId())) {
+  return item.getId();
+}
+
+int main() {
+  Item item;
+  {
+    int id = item.getId();
+  }
+  {
+    int id = getItemId(item);
+  }
+}

2nd/003_exception/004_system_error.cpp

@@ -0,0 +1,31 @@
+// Copyright (c) 2012-2015
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+#include <iostream>
+#include <string>
+#include <system_error>
+using namespace std;
+
+// サーバに接続を試みるOSのAPI
+int connect_to_server_api()
+{
+  return 503;
+}
+
+int main()
+{
+  try {
+    if (connect_to_server_api() == 503) {
+      // ネットワークがダウンしている。
+      // 503は「サービスが利用できない」ことを
+      // 表すHTTPのステータスコード。
+      error_code ec = make_error_code(errc::network_down);
+      throw system_error(ec);
+    }
+  }
+  catch (system_error& e) {
+    error_code ec = e.code();
+    cout << ec.message() << endl;
+  }
+}

2nd/003_exception/005_exception_ptr.cpp

@@ -0,0 +1,32 @@
+// Copyright (c) 2012-2013
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+#include <iostream>
+#include <stdexcept>
+#include <exception>
+
+using namespace std;
+
+void print(exception_ptr e) {
+  if (e == nullptr) {
+    cout << "no exception" << endl;
+  }
+  else {
+    cerr << "some exceptions" << endl;
+  }
+}
+
+int main() {
+  exception_ptr err1;
+  print(err1);
+  try {
+    exception_ptr err2;
+    print(err2);
+    throw runtime_error("test for exception_ptr");
+  }
+  catch (...) {
+    exception_ptr err3 = current_exception();
+    print(err3);
+  }
+}

2nd/003_exception/006_current_exception.cpp

@@ -0,0 +1,32 @@
+// Copyright (c) 2012-2013
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+#include <iostream>
+#include <stdexcept>
+#include <exception>
+
+using namespace std;
+
+void print(exception_ptr e) {
+  if (e == nullptr) {
+    cout << "no exception" << endl;
+  }
+  else {
+    cerr << "some exceptions" << endl;
+  }
+}
+
+int main() {
+  exception_ptr err1 = current_exception();
+  print(err1);
+  try {
+    exception_ptr err2 = current_exception();
+    print(err2);
+    throw runtime_error("test for current_exception()");
+  }
+  catch (...) {
+    exception_ptr err3 = current_exception();
+    print(err3);
+  }
+}

2nd/003_exception/007_rethrow_exception.cpp

@@ -0,0 +1,35 @@
+// Copyright (c) 2012-2013
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+#include <iostream>
+#include <exception>
+
+using namespace std;
+
+class xxx : public exception { };
+class yyy : public exception { };
+
+void throw_and_print(exception_ptr e) {
+  try {
+    rethrow_exception(e);
+  }
+  catch (xxx&) {
+    cerr << "xxx exception" << endl;
+  }
+  catch (yyy&) {
+    cerr << "yyy exception" << endl;
+  }
+}
+
+int main() {
+  exception_ptr err1 = make_exception_ptr(xxx());
+  throw_and_print(err1);
+  try {
+    throw yyy();
+  }
+  catch (...) {
+    exception_ptr err2 = current_exception();
+    throw_and_print(err2);
+  }
+}

2nd/003_exception/008_make_exception_ptr.cpp

@@ -0,0 +1,21 @@
+// Copyright (c) 2012-2013
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+#include <iostream>
+#include <stdexcept>
+#include <exception>
+
+using namespace std;
+
+class xxx : public exception { };
+
+int main() {
+  exception_ptr err = make_exception_ptr(xxx());
+  try {
+    rethrow_exception(err);
+  }
+  catch (xxx&) {
+    cerr << "xxx exception" << endl;
+  }
+}

2nd/003_exception/009_nested_exception.cpp

@@ -0,0 +1,30 @@
+// Copyright (c) 2012-2013
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+#include <iostream>
+#include <stdexcept>
+#include <exception>
+
+using namespace std;
+
+void print(exception_ptr e) {
+  if (e == nullptr) {
+    cout << "no nested exception" << endl;
+  }
+  else {
+    cerr << "some nested exception" << endl;
+  }
+}
+
+int main() {
+  nested_exception err1;
+  print(err1.nested_ptr());
+  try {
+    throw runtime_error("test for nested_exception()");
+  }
+  catch (...) {
+    nested_exception err2;
+    print(err2.nested_ptr());
+  }
+}

2nd/003_exception/011_rethrow_if_nested.cpp

@@ -0,0 +1,61 @@
+// Copyright (c) 2012-2013
+// Akira Takahashi, Toshihiko Ando, Kohsuke Yuasa,
+// Yusuke Ichinohe, Masaya Kusuda, wraith.
+// Released under the CC0 1.0 Universal license.
+#include <iostream>
+#include <exception>
+
+using namespace std;
+
+class xxx : public exception { };
+class yyy : public exception { };
+
+int main() {
+  try {
+    try {
+      try {
+        throw xxx();
+      }
+    catch (...) {
+        throw nested_exception();
+      }
+    }
+    catch (nested_exception& n) {
+      n.rethrow_nested();
+    }
+  }
+  catch (xxx&) {
+    cerr << "xxx exception" << endl;
+  }
+
+  try {
+    try {
+      try {
+        throw xxx();
+      }
+    catch (...) {
+        throw_with_nested(yyy());
+      }
+    }
+  catch (yyy& e) {
+      rethrow_if_nested(e);
+      cerr << "no nested_exception" << endl;
+    }
+  }
+  catch (xxx&) {
+    cerr << "xxx exception" << endl;
+  }
+
+  try {
+    try {
+      throw yyy();
+    }
+    catch (yyy& e) {
+      rethrow_if_nested(e);
+      cerr << "no nested_exception" << endl;
+    }
+  }
+  catch (yyy&) {
+    cerr << "yyy exception" << endl;
+  }
+}