Autosar Guidelines C++14, example code compile list(102)Rule A12-8-5 A copy assignment and a move assignment operators shall handle selfassignment.

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(102)
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。

#A12-8-5.cpp
##算譜(source code)

```c++:A12-8-5.cpp
// $Id: A12-8-5.cpp 271773 2017-03-23 13:16:53Z piotr.tanski $
#include <cstdint>
#include <stdexcept>
struct A
{
  std::int32_t number;
  std::int32_t* ptr;
// Implementation
};
class B
{
public:
// ...
  B& operator=(B const& oth) // Non-compliant
  {
    i = oth.i;
    delete aPtr;

    try
    {
      aPtr = new A(*oth.aPtr); // If this is the self-copy case, then
// the oth.a_ptr is already deleted
    }
    catch (std::bad_alloc&)
    {
      aPtr = nullptr;
    }

    return *this;
  }

private:
  std::int16_t i = 0;
  A* aPtr = nullptr;
};
class C
{
public:
  C& operator=(C const& oth) // Compliant
  {
    if (this != &oth)
    {
      A* tmpPtr = new A(*oth.aPtr);

      i = oth.i;
      delete aPtr;
      aPtr = tmpPtr;
    }
    return *this;
  }
  C& operator=(C&& oth) // Compliant
  {
    if (this != &oth)
    {
      A* tmpPtr = new A{std::move(*oth.aPtr)};

      i = oth.i;
      delete aPtr;
      aPtr = tmpPtr;
    }
    return *this;
  }

private:
  std::int16_t i = 0;
  A* aPtr = nullptr;
};
/// @ 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 a12-8-5
$ clang++ a12-8-5.cpp -I./ -std=c++14 -Wall
Rule A12-8-5 (required, implementation, automated) A copy assignment and a move assignment operators shall handle selfassignment.(102)A12-8-5.cpp
$ clang++ a12-8-5.cpp  -I./ -std=c++17 -Wall
Rule A12-8-5 (required, implementation, automated) A copy assignment and a move assignment operators shall handle selfassignment.(102)A12-8-5.cpp
$ clang++ a12-8-5.cpp  -I./ -std=c++2a -Wall
Rule A12-8-5 (required, implementation, automated) A copy assignment and a move assignment operators shall handle selfassignment.(102)A12-8-5.cpp

$ g++-8 a12-8-5.cpp  -I./ -std=c++14  -Wall
Rule A12-8-5 (required, implementation, automated) A copy assignment and a move assignment operators shall handle selfassignment.(102)A12-8-5.cpp
$ g++-8 a12-8-5.cpp  -I./ -std=c++17  -Wall
Rule A12-8-5 (required, implementation, automated) A copy assignment and a move assignment operators shall handle selfassignment.(102)A12-8-5.cpp
$ g++-8 a12-8-5.cpp  -I./ -std=c++2a  -Wall
Rule A12-8-5 (required, implementation, automated) A copy assignment and a move assignment operators shall handle selfassignment.(102)A12-8-5.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