Autosar Guidelines C++14, example code compile list(47)Rule A5-2-5 An array shall not be accessed beyond its range.

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(47)
https://www.autosar.org/fileadmin/user_upload/standards/adaptive/17-03/AUTOSAR_RS_CPP14Guidelines.pdf

Autosar Guidelines C++14 example code compile list
https://qiita.com/kaizen_nagoya/items/8ccbf6675c3494d57a76
#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。


#A5-2-5.cpp
##算譜(source code)

```c++:A5-2-5.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A5-2-5 (required, implementation, automated)An array shall not be accessed beyond its range.(47)A5-2-5.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" is from AUTOSAR without code having /// comment in line.
// $Id: A5-2-5.cpp 271752 2017-03-23 12:07:07Z piotr.tanski $
#include <array>
#include <cstdint>
#include <iostream>
void fn1() noexcept
{
  constexpr std::int32_t arraySize = 16;
  std::int32_t array[arraySize] {0};

  std::int32_t elem1 =
    array[0]; // Compliant - access with constant literal that
// is less than ArraySize
  std::int32_t elem2 =
    array[12]; // Compliant - access with constant literal that
// is less than ArraySize
  for (std::int32_t idx = 0; idx < 20; ++idx)
  {
    std::int32_t elem3 =
      array[idx]; // Non-compliant - access beyond ArraySize
// bounds, which has 16 elements
    cout <<"elem3="<<elem3<<endl;/// @ line for output
  }

  std::int32_t shift = 25;
  std::int32_t elem4 =
    *(array + shift); // Non-compliant - access beyond ArraySize bounds

  std::int32_t index = 0;
  std::cin >> index;
  std::int32_t elem5 =
    array[index]; // Non-compliant - index may exceed the ArraySize bounds
  if (index < arraySize)
  {
    std::int32_t elem6 = array[index]; // Compliant - range check coded
  }
  cout <<"fn1:elem1="<<elem1<<" elem2="<<elem2<<" elem4="<<elem4<<" elem5="<<elem5<<endl;/// @ line for output
}
void fn2() noexcept
{
  constexpr std::int32_t arraySize = 32;
  std::array<std::int32_t, arraySize> array;
  array.fill(0);

  std::int32_t elem1 =
    array[10]; // Compliant - access with constant literal that
// is less than ArraySize
  std::int32_t index = 40;
  std::int32_t elem2 =
    array[index]; // Non-compliant - access beyond ArraySize bounds
  try
  {
    std::int32_t elem3 =
      array.at(50); // Compliant - at() method provides a
// range check, throwing an exception if
// input exceeds the bounds
  }
  catch (std::out_of_range&)
  {
// Handle an error
    cout<<"elem3="<<elem3<<endl;/// @ line for output
    return;
  }

  for (auto&& e : array) // The std::array provides a possibility to iterate
// over its elements with range-based loop
  {
// Iterate over all elements
  }
  cout <<"fn2:elem1="<<elem1<<" elem2="<<elem2<<endl;/// @ line for output
}
///end AUTOSAR
int start() { /// @{} for start
  fn1();
  fn2();
  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 a5-2-5
$ clang++ a5-2-5.cpp -I./ -std=c++14 -Wall
a5-2-5.cpp:77:14: warning: unused variable 'e' [-Wunused-variable]
 for (auto&& e : array) // The std::array provides a possibility to iterate
             ^
1 warning generated.
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=198410824
elem3=1
elem3=-1347223395
elem3=1471818874
3
elem6=0
fn1:elem1=0 elem2=0 elem4=0 elem5=0
Rule A5-2-5 (required, implementation, automated)An array shall not be accessed beyond its range.(47)A5-2-5.cpp
$ clang++ a5-2-5.cpp  -I./ -std=c++17 -Wall
a5-2-5.cpp:77:14: warning: unused variable 'e' [-Wunused-variable]
 for (auto&& e : array) // The std::array provides a possibility to iterate
             ^
1 warning generated.
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=383763016
elem3=1
elem3=254214238
elem3=568582773
3
elem6=0
fn1:elem1=0 elem2=0 elem4=0 elem5=0
Rule A5-2-5 (required, implementation, automated)An array shall not be accessed beyond its range.(47)A5-2-5.cpp
$ clang++ a5-2-5.cpp  -I./ -std=c++2a -Wall
a5-2-5.cpp:77:14: warning: unused variable 'e' [-Wunused-variable]
 for (auto&& e : array) // The std::array provides a possibility to iterate
             ^
1 warning generated.
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=436560456
elem3=1
elem3=-1006763999
elem3=1199771141
3
elem6=0
fn1:elem1=0 elem2=0 elem4=0 elem5=0
Rule A5-2-5 (required, implementation, automated)An array shall not be accessed beyond its range.(47)A5-2-5.cpp

$ g++-8 a5-2-5.cpp  -I./ -std=c++14  -Wall
a5-2-5.cpp: In function 'void fn2()':
a5-2-5.cpp:77:14: warning: unused variable 'e' [-Wunused-variable]
  for (auto&& e : array) // The std::array provides a possibility to iterate
              ^
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=367039048
elem3=1
elem3=0
elem3=0
3
elem6=0
fn1:elem1=0 elem2=0 elem4=0 elem5=0
Rule A5-2-5 (required, implementation, automated)An array shall not be accessed beyond its range.(47)A5-2-5.cpp
$ g++-8 a5-2-5.cpp  -I./ -std=c++17  -Wall
a5-2-5.cpp: In function 'void fn2()':
a5-2-5.cpp:77:14: warning: unused variable 'e' [-Wunused-variable]
  for (auto&& e : array) // The std::array provides a possibility to iterate
              ^
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=146989640
elem3=1
elem3=0
elem3=0
3
elem6=0
fn1:elem1=0 elem2=0 elem4=0 elem5=0
Rule A5-2-5 (required, implementation, automated)An array shall not be accessed beyond its range.(47)A5-2-5.cpp
$ g++-8 a5-2-5.cpp  -I./ -std=c++2a  -Wall
a5-2-5.cpp: In function 'void fn2()':
a5-2-5.cpp:77:14: warning: unused variable 'e' [-Wunused-variable]
  for (auto&& e : array) // The std::array provides a possibility to iterate
              ^
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=0
elem3=345535048
elem3=1
elem3=0
elem3=0
3
elem6=0
fn1:elem1=0 elem2=0 elem4=0 elem5=0
Rule A5-2-5 (required, implementation, automated)An array shall not be accessed beyond its range.(47)A5-2-5.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
今回はconsole入力値を3にした。どういう値だと試験になるか要確認。

#参考文献(reference)

###プログラミング言語教育のXYZ
https://qiita.com/kaizen_nagoya/items/1950c5810fb5c0b07be4
プログラミング言語教育のXYZ(youtube)
https://www.youtube.com/watch?v=He1_tg4px-w&t=486s

###C++N4741 2018
Working Draft, Standard for Programming Language C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/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/

###　CEDD(Compile Error Driven Design) 
初めての　CEDD(Compile Error Driven Design) ８回直してコンパイル。
https://qiita.com/kaizen_nagoya/items/9494236aa1753f3fd1e1

コンパイルエラーを記録するとよい理由7つ
https://qiita.com/kaizen_nagoya/items/85c0e92b206883140e89

C Puzzle Bookの有り難み5つ、C言語規格及びCコンパイラの特性を認識
https://qiita.com/kaizen_nagoya/items/d89a48c1536a02ecdec9

C言語（C++)に対する誤解、曲解、無理解、爽快。
https://qiita.com/kaizen_nagoya/items/3f3992c9722c1cee2e3a

Qiitaに投稿するCのStyle例(暫定)
https://qiita.com/kaizen_nagoya/items/946df1528a6a1ef2bc0d

C++N4606 Working Draft 2016, ISO/IEC 14882, C++ standardのコード断片をコンパイルするためにしていること
https://qiita.com/kaizen_nagoya/items/a8d7ee2f2e29e76c19c1

コンパイル用shell script C版(clangとgcc)とC++版(clang++とg++)
https://qiita.com/kaizen_nagoya/items/74220c0577a512c2d7da

[C][C++]の国際規格案の例題をコンパイルするときの課題７つ。
https://qiita.com/kaizen_nagoya/items/5f4b155030259497c4de


docker gnu(gcc/g++) and llvm(clang/clang++)
https://qiita.com/drafts/059874ea39c4de64c0f7

#文書履歴(document history)
ver 0.10 初稿 20180610
ver 0.12 一覧追記  参考文献欄追記 20180616
ver 0.11 一覧追記 20180613
### 最後までおよみいただきありがとうございました。

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