Autosar Guidelines C++14, example code compile list(83)Rule A10-3-2  Each overriding virtual function shall be declared with the override or final specifier.

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(83)
https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf
Autosar Guidelines C++14, example code compile list(
#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、(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を検討するため、-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とともに、各標準段階, hosted, freestandingの特徴と課題を明確にする。


#A10-3-2.cpp
##算譜(source code)

```c++:A10-3-2.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A10-3-2 (required, implementation, automated)Each overriding virtual function shall be declared with the override or final specifier.(83)A10-3-2.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" is from AUTOSAR without code having /// comment in line.
// $Id: A10-3-2.cpp 271687 2017-03-23 08:57:35Z piotr.tanski $
class A
{
public:
  virtual ~A() {}
  virtual void f() noexcept = 0;
  virtual void g() noexcept {}
  virtual void z() noexcept {}
  virtual A& operator+=(A const& oth) = 0;
};
class B : public A
{
public:
  ~B() override {} // Compliant
  void f() noexcept // Non-compliant
  {
  }
  virtual void g() noexcept // Non-compliant
  {
  }
  void z() noexcept override // Compliant
  {
  }
  B& operator+=(A const& oth) override // Compliant
  {
    return *this;
  }
};
class C : public A
{
public:
  ~C() {} // Non-compliant
  void f() noexcept override // Compliant
  {
  }
  void g() noexcept override // Compliant
  {
  }
  void z() noexcept override // Compliant
  {
  }
  C& operator+=(A const& oth) // Non-compliant
  {
    return *this;
  }
};
///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 a10-3-2
$ clang++ a10-3-2.cpp -I./ -std=c++14 -Wall
a10-3-2.cpp:27:7: warning: 'f' overrides a member function but is not marked 'override' [-Winconsistent-missing-override]
 void f() noexcept // Non-compliant
      ^
a10-3-2.cpp:18:14: note: overridden virtual function is here
virtual void f() noexcept = 0;
             ^
a10-3-2.cpp:30:15: warning: 'g' overrides a member function but is not marked 'override' [-Winconsistent-missing-override]
 virtual void g() noexcept // Non-compliant
              ^
a10-3-2.cpp:19:14: note: overridden virtual function is here
virtual void g() noexcept {}
             ^
a10-3-2.cpp:54:5: warning: 'operator+=' overrides a member function but is not marked 'override'
      [-Winconsistent-missing-override]
 C& operator+=(A const& oth) // Non-compliant
    ^
a10-3-2.cpp:21:12: note: overridden virtual function is here
virtual A& operator+=(A const& oth) = 0;
           ^
3 warnings generated.
Rule A10-3-2 (required, implementation, automated)Each overriding virtual function shall be declared with the override or final specifier.(83)A10-3-2.cpp
$ clang++ a10-3-2.cpp  -I./ -std=c++17 -Wall
a10-3-2.cpp:27:7: warning: 'f' overrides a member function but is not marked 'override' [-Winconsistent-missing-override]
 void f() noexcept // Non-compliant
      ^
a10-3-2.cpp:18:14: note: overridden virtual function is here
virtual void f() noexcept = 0;
             ^
a10-3-2.cpp:30:15: warning: 'g' overrides a member function but is not marked 'override' [-Winconsistent-missing-override]
 virtual void g() noexcept // Non-compliant
              ^
a10-3-2.cpp:19:14: note: overridden virtual function is here
virtual void g() noexcept {}
             ^
a10-3-2.cpp:54:5: warning: 'operator+=' overrides a member function but is not marked 'override'
      [-Winconsistent-missing-override]
 C& operator+=(A const& oth) // Non-compliant
    ^
a10-3-2.cpp:21:12: note: overridden virtual function is here
virtual A& operator+=(A const& oth) = 0;
           ^
3 warnings generated.
Rule A10-3-2 (required, implementation, automated)Each overriding virtual function shall be declared with the override or final specifier.(83)A10-3-2.cpp
$ clang++ a10-3-2.cpp  -I./ -std=c++2a -Wall
a10-3-2.cpp:27:7: warning: 'f' overrides a member function but is not marked 'override' [-Winconsistent-missing-override]
 void f() noexcept // Non-compliant
      ^
a10-3-2.cpp:18:14: note: overridden virtual function is here
virtual void f() noexcept = 0;
             ^
a10-3-2.cpp:30:15: warning: 'g' overrides a member function but is not marked 'override' [-Winconsistent-missing-override]
 virtual void g() noexcept // Non-compliant
              ^
a10-3-2.cpp:19:14: note: overridden virtual function is here
virtual void g() noexcept {}
             ^
a10-3-2.cpp:54:5: warning: 'operator+=' overrides a member function but is not marked 'override'
      [-Winconsistent-missing-override]
 C& operator+=(A const& oth) // Non-compliant
    ^
a10-3-2.cpp:21:12: note: overridden virtual function is here
virtual A& operator+=(A const& oth) = 0;
           ^
3 warnings generated.
Rule A10-3-2 (required, implementation, automated)Each overriding virtual function shall be declared with the override or final specifier.(83)A10-3-2.cpp

$ g++-8 a10-3-2.cpp  -I./ -std=c++14  -Wall
Rule A10-3-2 (required, implementation, automated)Each overriding virtual function shall be declared with the override or final specifier.(83)A10-3-2.cpp
$ g++-8 a10-3-2.cpp  -I./ -std=c++17  -Wall
Rule A10-3-2 (required, implementation, automated)Each overriding virtual function shall be declared with the override or final specifier.(83)A10-3-2.cpp
$ g++-8 a10-3-2.cpp  -I./ -std=c++2a  -Wall
Rule A10-3-2 (required, implementation, automated)Each overriding virtual function shall be declared with the override or final specifier.(83)A10-3-2.cpp
```

###Visual Studio 2017

```
>cl A10-3-2.cpp /EHsc
Microsoft (R) Incremental Linker Version 14.15.26726.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:a10-3-2.exe 
a10-3-2.obj 

>A10-3-2
Rule A10-3-2 (required, implementation, automated)Each overriding virtual function shall be declared with the override or final specifier.(83)A10-3-2.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
clang++警告あり, g++警告なし

###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 20180611
ver 0.20 Visual Studio 2017追記　20180916