Autosar Guidelines C++14, example code compile list(120)Rule A15-0-4 Unchecked exceptions shall be used to represent errors 

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(118)
https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf

Autosar Guidelines C++14 example code compile list
https://qiita.com/kaizen_nagoya/items/8ccbf6675c3494d57a76
#目的(purpose)
AutosarのC++ GuidelineをOS, 制御のプログラムで利用するにあたって、以下を検討する。
(1)hosted, freestandingのどちらを基本にすべきか。(2)C++2014,C++2017, C++202aのどれを用いると良いか。
(3)どの処理系を併用すると良いか。
-std=c++14, -std=c++17, -std=c++2aの3種類で、複数のコンパイラでコンパイルすることにより、誤(error)、警告(warning)、関数・変数連携(link)、出力(output)、にどのような影響があるかを確認する。
#成果(outcome)
複数の処理系の特徴が明確になる。
各標準段階の違いを明確にする。
hostedまたはfreestandingの特徴と課題を明確にする。


#A15-0-4.cpp
##算譜(source code)

```c++:A15-0-4.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A15-0-4 (required, implementation, non-automated)Unchecked exceptions shall be used to represent errors from which the caller cannot reasonably be expected to recover. (118)A15-0-4.cpp";
//https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf
// There is no description about Autosar declear hosted or freestanding.
// If the Autosar intended both depending on the cases, autosar.h can choose one.
// Compile with -DHOSTED work as  hosted environment, -DFREESTANDING work as freestanding.

#include "autosar.h"/// @line add header file https://qiita.com/kaizen_nagoya/items/4bde8f21ab059b96cf2a

using namespace std;/// @line add using

/// @ start AUTOSAR: From here to the "///end AUTOSAR" are from the AUTOSAR code without some code having /// comment in line.
//% $Id: A15-0-4.cpp 271752 2017-03-23 12:07:07Z piotr.tanski $
#include <cstdint>
#include <stdexcept>
class InvalidArguments : public std::logic_error // Compliant - invalid
// arguments error is
// "unchecked" exception
{
public:
  using std::logic_error::logic_error;
};
class OutOfMemory : public std::bad_alloc // Compliant - insufficient memory
// error is "unchecked" exception
{
public:
  using std::bad_alloc::bad_alloc;
};
class DivisionByZero : public std::logic_error // Compliant - division by zero
// error is "unchecked"
// exception
{
public:
  using std::logic_error::logic_error;
};
class CommunicationError : public std::logic_error // Non-compliant -
// communication error
// should be "checked"
// exception but defined to be "unchecked"
{
public:
  using std::logic_error::logic_error;
};
double division(std::int32_t a, std::int32_t b) noexcept(false)
{
// ...
  if (b == 0)
  {
    throw DivisionByZero(
      "Division by zero error"); // Unchecked exception thrown correctly
  }

// ...
  cout << "a="<<a<<" b="<<b<<endl;/// @ line for output
  return (double)a*b; // @ line for warning
}
void allocate(std::uint32_t bytes) noexcept(false)
{
// ...
  throw OutOfMemory(); // Unchecked exception thrown correctly
}
void initializeSocket() noexcept(false)
{
  bool validParameters = true;

// ...
  if (!validParameters)
  {
    throw InvalidArguments("Invalid parameters passed"); // Unchecked
// exception
// thrown
// correctly
  }
}
void sendData(std::int32_t socket) noexcept(false)
{
// ...
  bool isSentSuccessfully = true;

// ...
  if (!isSentSuccessfully)
  {
    throw CommunicationError("Could not send data"); // Unchecked exception
// thrown when checked
// exception should
// be.
  }
}
/// @ end AUTOSAR
int start() { /// @{} for start
  cout<< msg << endl;
  ShutdownOS()  EXIT_SUCCESS;
/// Autosar OS 3.1.1, 2009: 7.1.2.2 Undefined Behaviour in OSEK OS
/// OS425 If ShutdownOS is called and ShutdownHook() returns then the operating system shall disable all interrupts and enter an endless loop.
}
```
##編纂・実行結果(compile and go)

```shell-session:cpa.sh
$ ../cpa.sh a15-0-4
$ clang++ a15-0-4.cpp -I./ -std=c++14 -Wall
Rule A15-0-4 (required, implementation, non-automated)Unchecked exceptions shall be used to represent errors from which the caller cannot reasonably be expected to recover. (118)A15-0-4.cpp
$ clang++ a15-0-4.cpp  -I./ -std=c++17 -Wall
Rule A15-0-4 (required, implementation, non-automated)Unchecked exceptions shall be used to represent errors from which the caller cannot reasonably be expected to recover. (118)A15-0-4.cpp
$ clang++ a15-0-4.cpp  -I./ -std=c++2a -Wall
Rule A15-0-4 (required, implementation, non-automated)Unchecked exceptions shall be used to represent errors from which the caller cannot reasonably be expected to recover. (118)A15-0-4.cpp

$ g++-8 a15-0-4.cpp  -I./ -std=c++14  -Wall
Rule A15-0-4 (required, implementation, non-automated)Unchecked exceptions shall be used to represent errors from which the caller cannot reasonably be expected to recover. (120)A15-0-4.cpp
$ g++-8 a15-0-4.cpp  -I./ -std=c++17  -Wall
Rule A15-0-4 (required, implementation, non-automated)Unchecked exceptions shall be used to represent errors from which the caller cannot reasonably be expected to recover. (120)A15-0-4.cpp
$ g++-8 a15-0-4.cpp  -I./ -std=c++2a  -Wall
Rule A15-0-4 (required, implementation, non-automated)Unchecked exceptions shall be used to represent errors from which the caller cannot reasonably be expected to recover. (118)A15-0-4.cpp
```
#検討事項(agenda)
###1. 自律(freestanding)環境. 接待(hosted)環境

C++N4606 1.4 Implementation compliance p.4

###2. 対応OSの水準、対応通信規約、応用機能による分類
freestanding用の関数、ライブラリ等
###3. C++2014, C++2017, C++202aの比較項目
本件なし
###4. clang++, g++の比較検討項目
本件なし

###5. 役立つまたは意味のある出力

#参考文献(reference)
###C++N4741 2018
Working Draft, Standard for Programming Language C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/n4741.pdf

C++N4741, 2018 Standard Working Draft on ISO/IEC 14882 sample code compile list
https://qiita.com/kaizen_nagoya/items/3294c014044550896010

###C++N4606 2016
Working Draft, Standard for Programming Language C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/n4606.pdf

C++N4606, 2016符号断片編纂一覧(example code compile list)
 Working Draft 2016, ISO/IEC 14882(1)
https://qiita.com/kaizen_nagoya/items/df5d62c35bd6ed1c3d43/

#文書履歴(document history)
ver 0.10 初稿 20180612
ver 0.11 一覧追記 20180613