Autosar Guidelines C++14, example code compile list(137)Rule A15-4-4  A declaration of non-throwing function 

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(137)
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。


#A15-4-4.cpp
##算譜(source code)

```c++:A15-4-4.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A15-4-4 (required, implementation, automated) A declaration of non-throwing function shall contain noexcept specification.(137)A15-4-4.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: A15-4-4.cpp 271715 2017-03-23 10:13:51Z piotr.tanski $
#include <iostream>
#include <stdexcept>
void f1() {
  cout<<"f1()"<<endl; /// @ {} add for link error
} // Compliant - f1, without noexcept specification, declares to throw
// exceptions implicitly
void f2()noexcept {
  cout<<"f1()"<<endl; /// @ {} add for link error
} // Compliant - f2 does not throw exceptions
void f3() noexcept(true) {
  cout<<"f1()"<<endl; /// @ {} add for link error
} // Compliant - f3 does not throw exceptions
void f4() noexcept(false) {
  cout<<"f1()"<<endl; /// @ {} add for link error
} // Compliant - f4 declares to throw exceptions
void f5() noexcept // Compliant - f5 does not throw exceptions
{
  try
  {
    f1(); // Exception handling needed, f1 has no noexcept specification
  }

  catch (std::exception& e)
  {
// Handle exceptions
  }

  f2(); // Exception handling not needed, f2 is noexcept
  f3(); // Exception handling not needed, f3 is noexcept(true)

  try
  {
    f4(); // Exception handling needed, f4 is noexcept(false)
  }

  catch (std::exception& e)
  {
// Handle exceptions
  }
}
template <class T>
void f6() noexcept(noexcept(T())); // Compliant - function f6() may be
// noexcept(true) or noexcept(false)
// depending on constructor of class T
template <class T>
class A
{
public:
  A() noexcept(noexcept(T())) // Compliant - constructor of class A may be
// noexcept(true) or noexcept(false) depending on
// constructor of class T
  {
  }
};
class C1
{
public:
  C1()
  noexcept(
    true) // Compliant - constructor of class C1 does not throw exceptions
  {
  }
// ...
};
class C2
{
public:
  C2() // Compliant - constructor of class C2 throws exceptions
  {
  }
// ...
};
void f7() noexcept // Compliant - f7 does not throw exceptions
{
  std::cout << noexcept(A<C1>()) << '\n'; // prints '1' - constructor of
// A<C1> class is noexcept(true)
// because constructor of C1 class
// is declared to be noexcept(true)
  std::cout << noexcept(A<C2>()) << '\n'; // prints '0' - constructor of
// A<C2> class is noexcept(false)
// because constructor of C2 class
// has no noexcept specifier
}
/// @ end AUTOSAR
int start() { /// @{} for start
  f5();
  f7();
  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 a15-4-4
$ clang++ a15-4-4.cpp -I./ -std=c++14 -Wall
f1()
f1()
f1()
f1()
1
0
Rule A15-4-4 (required, implementation, automated) A declaration of non-throwing function shall contain noexcept specification.(137)A15-4-4.cpp
$ clang++ a15-4-4.cpp  -I./ -std=c++17 -Wall
f1()
f1()
f1()
f1()
1
0
Rule A15-4-4 (required, implementation, automated) A declaration of non-throwing function shall contain noexcept specification.(137)A15-4-4.cpp
$ clang++ a15-4-4.cpp  -I./ -std=c++2a -Wall
f1()
f1()
f1()
f1()
1
0
Rule A15-4-4 (required, implementation, automated) A declaration of non-throwing function shall contain noexcept specification.(137)A15-4-4.cpp

$ g++-8 a15-4-4.cpp  -I./ -std=c++14  -Wall
f1()
f1()
f1()
f1()
1
0
Rule A15-4-4 (required, implementation, automated) A declaration of non-throwing function shall contain noexcept specification.(137)A15-4-4.cpp
$ g++-8 a15-4-4.cpp  -I./ -std=c++17  -Wall
f1()
f1()
f1()
f1()
1
0
Rule A15-4-4 (required, implementation, automated) A declaration of non-throwing function shall contain noexcept specification.(137)A15-4-4.cpp
$ g++-8 a15-4-4.cpp  -I./ -std=c++2a  -Wall
f1()
f1()
f1()
f1()
1
0
Rule A15-4-4 (required, implementation, automated) A declaration of non-throwing function shall contain noexcept specification.(137)A15-4-4.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. f6()がコンパイルエラーにならないような役立つまたは意味のある修正方法
###6. 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