Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(116)
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。

A14-8-1.cpp

算譜(source code)

A14-8-1.cpp

//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A14-8-1 (advisory, implementation, automated)The set of function overloads should not contain function templates,functions specializations and non-template overloading functions.(116)A14-8-1.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: A14-8-1.cpp 271715 2017-03-23 10:13:51Z piotr.tanski $
# include <cstdint>
template <typename T>
void f1(T t)
{
// Implementation
}
void f1(std::int16_t n)
{
// Implementation
}
void fn1() noexcept
{
  std::int16_t x = 0;
  f1(x); // f1(std::int16_t) is called
  f1(x + 10); // f1(T) is called with T = int
  f1<>(x); // explicit call to f1(T) with T = short int
  f1<>(x + 10); // explicit call to f1(T) with T = int
  cout << "x="<<x<<endl;/// @ line for output
}
template <typename T>
void f2(T t)
{
// Implementation
  cout << " void f2(T t)"<<endl;/// @ line for output

}
template <>
void f2<std::int16_t>(std::int16_t n)
{
  cout << " void f2std::int16_t>(std::int16_t n)"<<endl;/// @ line for output

// Implementation
}
void f2(std::int16_t n)
{
  cout << " void f2(std::int16_t n)"<<endl;/// @ line for output

// Implementation
}
void fn2() noexcept
{
  std::int16_t x = 0;
  f2(x); // f2(std::int16_t) is called
  f2(x + 10); // f2(T) is called with T = int
  f2<>(x); // explicit call to f2<std::int16_t>(std::int16_t)
  f2<>(x + 10); // explicit call to f2(T) with T = int
  f2<std::int16_t>(x +
                   10); // explicit call to f2<std::int16_t>(std::int16_t)
}
void f3(std::int16_t n)
{
  cout << " void f3(std::int16_t n)"<<endl;/// @ line for output

// Implementation
}
void f3(std::int32_t n)
{
  cout << " void f3(std::int32_t n)"<<endl;/// @ line for output

// Implementation
}
void fn3() noexcept
{
  std::int16_t x = 0;
  f3(x); // f3(std::int16_t) is called
  f3(x + 10); // f3(std::int32_t) is called

}
template <typename T>
void f4(T t)
{
  cout << " void f4(T t)"<<endl;/// @ line for output

// Implementation
}
template <>
void f4<std::int16_t>(std::int16_t n)
{
  cout << " void f4<std::int16_t>(std::int16_t n)"<<endl;/// @ line for output

// Implementation
}
void fn4() noexcept
{
  std::int16_t x = 0;
  f4(x); // f4(T) with T = short int is called
  f4(x + 10); // f4(T) with T = int is called
  f4<std::int16_t>(x + 100); // explicit call to f4(T) with T = short int
}
/// @ end AUTOSAR
int start() { /// @{} for start
  fn1();
  fn2();
  fn3();
  fn4();
  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 a14-8-1
$ clang++ a14-8-1.cpp -I./ -std=c++14 -Wall
x=0
 void f2(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f3(std::int16_t n)
 void f3(std::int32_t n)
 void f4<std::int16_t>(std::int16_t n)
 void f4(T t)
 void f4<std::int16_t>(std::int16_t n)
Rule A14-8-1 (advisory, implementation, automated)The set of function overloads should not contain function templates,functions specializations and non-template overloading functions.(116)A14-8-1.cpp
$ clang++ a14-8-1.cpp  -I./ -std=c++17 -Wall
x=0
 void f2(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f3(std::int16_t n)
 void f3(std::int32_t n)
 void f4<std::int16_t>(std::int16_t n)
 void f4(T t)
 void f4<std::int16_t>(std::int16_t n)
Rule A14-8-1 (advisory, implementation, automated)The set of function overloads should not contain function templates,functions specializations and non-template overloading functions.(116)A14-8-1.cpp
$ clang++ a14-8-1.cpp  -I./ -std=c++2a -Wall
x=0
 void f2(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f3(std::int16_t n)
 void f3(std::int32_t n)
 void f4<std::int16_t>(std::int16_t n)
 void f4(T t)
 void f4<std::int16_t>(std::int16_t n)
Rule A14-8-1 (advisory, implementation, automated)The set of function overloads should not contain function templates,functions specializations and non-template overloading functions.(116)A14-8-1.cpp

$ g++-8 a14-8-1.cpp  -I./ -std=c++14  -Wall
x=0
 void f2(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f3(std::int16_t n)
 void f3(std::int32_t n)
 void f4<std::int16_t>(std::int16_t n)
 void f4(T t)
 void f4<std::int16_t>(std::int16_t n)
Rule A14-8-1 (advisory, implementation, automated)The set of function overloads should not contain function templates,functions specializations and non-template overloading functions.(116)A14-8-1.cpp
$ g++-8 a14-8-1.cpp  -I./ -std=c++17  -Wall
x=0
 void f2(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f3(std::int16_t n)
 void f3(std::int32_t n)
 void f4<std::int16_t>(std::int16_t n)
 void f4(T t)
 void f4<std::int16_t>(std::int16_t n)
Rule A14-8-1 (advisory, implementation, automated)The set of function overloads should not contain function templates,functions specializations and non-template overloading functions.(116)A14-8-1.cpp
$ g++-8 a14-8-1.cpp  -I./ -std=c++2a  -Wall
x=0
 void f2(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f2(T t)
 void f2std::int16_t>(std::int16_t n)
 void f3(std::int16_t n)
 void f3(std::int32_t n)
 void f4<std::int16_t>(std::int16_t n)
 void f4(T t)
 void f4<std::int16_t>(std::int16_t n)
Rule A14-8-1 (advisory, implementation, automated)The set of function overloads should not contain function templates,functions specializations and non-template overloading functions.(116)A14-8-1.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