Autosar Guidelines C++14, example code compile list(121)Rule A15-0-5 Checked 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(121)
https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf
Autosar Guidelines C++14, example code compile list will be listed.
#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。


#A15-0-5.cpp
##算譜(source code)

```c++:A15-0-5.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A15-0-5 (required, implementation, non-automated)Checked exceptions shall be used to represent errors from which the caller can reasonably be expected to recover. (111)A15-0-5.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: A15-0-5.cpp 271752 2017-03-23 12:07:07Z piotr.tanski $
#include <cstdint>
#include <stdexcept>
class CommunicationError
  : public std::exception // Compliant - communication error is "checked"
{
public:
  explicit CommunicationError(const char* message) : msg(message) {}
  CommunicationError(CommunicationError const&) noexcept = default;
  CommunicationError& operator=(CommunicationError const&) noexcept = default;
  ~CommunicationError() override = default;

  const char* what() const noexcept override {
    return msg;
  }
  void f() {
    cout<<"CommunicationError:"<<msg<<endl; /// @ line for output
  }
private:
  const char* msg;
};
class BusError
  : public CommunicationError // Compliant - bus error is "checked"
{
public:
  using CommunicationError::CommunicationError;
};
class Timeout : public std::runtime_error // Compliant - communication timeout
// is "checked"
{
public:
  using std::runtime_error::runtime_error;
};
class PreconditionsError : public std::exception // Non-compliant - error on
// preconditions check should
// be "unchecked" but is
// defined to be "checked"
{
// Implementation
};
void fn1(std::uint8_t* buffer, std::uint8_t bufferLength) noexcept(false)
{
  bool sentSuccessfully = true;

// ...
  if (!sentSuccessfully)
  {
    throw CommunicationError(
      "Could not send data"); // Checked exception thrown correctly
  }
  cout <<"fn1:"<<(int)buffer[1]<<endl;/// @ line for output
}
void fn2(std::uint8_t* buffer, std::uint8_t bufferLength) noexcept(false)
{
  bool initSuccessfully = true;

  if (!initSuccessfully)
  {
    throw PreconditionsError(); // An exception thrown on preconditions
// check failure should be "Unchecked", but
// PreconditionsError is "Checked"
  }

// ...
  bool sentSuccessfully = true;
  bool isTimeout = false;

// ...
  if (!sentSuccessfully)
  {
    throw BusError(
      "Could not send data"); // Checked exception thrown correctly
  }

// ...
  if (isTimeout)
  {
    throw Timeout("Timeout reached"); // Checked exception thrown correctly
  }
  cout <<"fn2:"<<(int)buffer[2]<<endl;/// @ line for output

}
void fn3(std::uint8_t* buffer) noexcept(false)
{
  bool isResourceBusy = false;

// ...
  if (isResourceBusy)
  {
    throw std::runtime_error(
      "Resource is busy now"); // Checked exception thrown correctly
  }
  cout <<"fn3:"<<(int)buffer[3]<<endl;/// @ line for output

}
/// @ end AUTOSAR
int start() { /// @{} for start
  constexpr uint8_t bufferLength = 12;
  uint8_t buffer[bufferLength]= {1,2,3,4,5,6,7,8,9,10,11,12};
  fn1(buffer, bufferLength);
  fn2(buffer, bufferLength);
  fn3(buffer);
  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 a15-0-5
$ clang++ a15-0-5.cpp -I./ -std=c++14 -Wall
fn1:2
fn2:3
fn3:4
Rule A15-0-5 (required, implementation, non-automated)Checked exceptions shall be used to represent errors from which the caller can reasonably be expected to recover. (119)A15-0-5.cpp
$ clang++ a15-0-5.cpp  -I./ -std=c++17 -Wall
fn1:2
fn2:3
fn3:4
Rule A15-0-5 (required, implementation, non-automated)Checked exceptions shall be used to represent errors from which the caller can reasonably be expected to recover. (119)A15-0-5.cpp
$ clang++ a15-0-5.cpp  -I./ -std=c++2a -Wall
fn1:2
fn2:3
fn3:4
Rule A15-0-5 (required, implementation, non-automated)Checked exceptions shall be used to represent errors from which the caller can reasonably be expected to recover. (119)A15-0-5.cpp

$ g++-8 a15-0-5.cpp  -I./ -std=c++14  -Wall
fn1:2
fn2:3
fn3:4
Rule A15-0-5 (required, implementation, non-automated)Checked exceptions shall be used to represent errors from which the caller can reasonably be expected to recover. (119)A15-0-5.cpp
$ g++-8 a15-0-5.cpp  -I./ -std=c++17  -Wall
fn1:2
fn2:3
fn3:4
Rule A15-0-5 (required, implementation, non-automated)Checked exceptions shall be used to represent errors from which the caller can reasonably be expected to recover. (119)A15-0-5.cpp
$ g++-8 a15-0-5.cpp  -I./ -std=c++2a  -Wall
fn1:2
fn2:3
fn3:4
Rule A15-0-5 (required, implementation, non-automated)Checked exceptions shall be used to represent errors from which the caller can reasonably be expected to recover. (119)A15-0-5.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/2017/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
ver 0.10 初稿 20180612