Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(129)
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。

A15-3-1.cpp

算譜(source code)

A15-3-1.cpp

//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A15-3-1 (advisory, implementation, automated) Unchecked exceptions should be handled only in main or thread’s main functions.(129)A15-3-1.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: A15-3-1.cpp 271687 2017-03-23 08:57:35Z piotr.tanski $
# include <cstdint>
# include <stdexcept>
class OutOfMemory : public std::logic_error // Unchecked exception
{
public:
  using std::logic_error::logic_error;
};
void f1() noexcept(false)
{
// ...
  throw OutOfMemory("Not enough memory");
}
void f2() noexcept
{
  try
  {
    f1();
  }
  catch (OutOfMemory& e) // Non-compliant - program is not able to handle an
// OutOfMemory error in a meaningful way, the error
// will still exist
  {
// Handle an exception
  }
}
void f3() noexcept(false)
{
// ...
  try
  {
// ...
    f1();
  }
  catch (OutOfMemory& e)
  {
// Nothing to do, just re-throw
    throw; // Non-compliant - it is inefficient to catch and re-throw an
// error that can not be handled in f3()
  }
}
void f4() noexcept(false)
{
// ...
  f1(); // Compliant - OutOfMemory error can not be handled in f4()
// ...
}
int main(int, char**)
{
  try
  {
    f4();
  }
  catch (OutOfMemory& e) // Compliant - OutOfMemory caught in main() function
// so the program can clean-up and exit correctly
  {
// Report the error and exit from the program correctly
  }

///return 0;/// @ comment for output
///} /// @ comment for output
/// @ 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)

cpa.sh

$ ../cpa.sh a15-3-1
$ clang++ a15-3-1.cpp -I./ -std=c++14 -Wall
Rule A15-3-1 (advisory, implementation, automated) Unchecked exceptions should be handled only in main or thread’s main functions.(127)A15-3-1.cpp
$ clang++ a15-3-1.cpp  -I./ -std=c++17 -Wall
Rule A15-3-1 (advisory, implementation, automated) Unchecked exceptions should be handled only in main or thread’s main functions.(127)A15-3-1.cpp
$ clang++ a15-3-1.cpp  -I./ -std=c++2a -Wall
Rule A15-3-1 (advisory, implementation, automated) Unchecked exceptions should be handled only in main or thread’s main functions.(127)A15-3-1.cpp

$ g++-8 a15-3-1.cpp  -I./ -std=c++14  -Wall
Rule A15-3-1 (advisory, implementation, automated) Unchecked exceptions should be handled only in main or thread’s main functions.(127)A15-3-1.cpp
$ g++-8 a15-3-1.cpp  -I./ -std=c++17  -Wall
Rule A15-3-1 (advisory, implementation, automated) Unchecked exceptions should be handled only in main or thread’s main functions.(127)A15-3-1.cpp
$ g++-8 a15-3-1.cpp  -I./ -std=c++2a  -Wall
Rule A15-3-1 (advisory, implementation, automated) Unchecked exceptions should be handled only in main or thread’s main functions.(127)A15-3-1.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