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@kaizen_nagoya(Dr. Kiyoshi Ogawa)

Autosar Guidelines C++14, example code compile list(77)Rule A8-5-4 A constructor taking parameter of type std::initializer_list

Posted at

Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(77)
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。

#A8-5-1-4.cpp
##算譜(source code)

A8-5-4.cpp
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A8-5-4 (advisory, implementation, non-automated)A constructor taking parameter of type std::initializer_list shall only be defined in classes that internally store a collection of objects.(77)A8-5-4.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" is from AUTOSAR without code having /// comment in line.
// $Id: A8-5-4.cpp 271752 2017-03-23 12:07:07Z piotr.tanski $
#include <algorithm>
#include <cstdint>
#include <initializer_list>
#include <vector>
class A
{
public:
  A() : x(0), y(0) {}
  A(std::int32_t first, std::int32_t second) : x(first), y(second) {}
  A(std::initializer_list<std::int32_t> list)
    : x(0), y(0) // Non-compliant - class A does not store a collection
// of objects
  {
// ...
  }
  void f() {
    cout <<"x="<<x<<" y="<<y<<endl;
  }
private:
  std::int32_t x;
  std::int32_t y;
};
class B
{
public:
  B() : collection() {}
  B(std::int32_t size, std::int32_t value) : collection(size, value) {}
  B(std::initializer_list<std::int32_t> list)
    : collection(
        list) // Compliant - class B stores a collection of objects
  {
  }

private:
  std::vector<std::int32_t> collection;
};
class C
{
public:
  C() : array{0} {}
  C(std::initializer_list<std::int32_t> list)
    : array{0} // Compliant - class C stores a collection of objects
  {
    std::copy(list.begin(), list.end(), array);
  }

private:
  static constexpr std::int32_t size = 100;
  std::int32_t array[size];
};
class D : public C
{
public:
  D() : C() {}
  D(std::initializer_list<std::int32_t> list)
    : C{list} // Compliant - class D inherits a collection of objects
// from class C
  {
  }
};
class E
{
public:
  E() : container() {}
  E(std::initializer_list<std::int32_t> list)
    : container{list} // Compliant - class E stores class C which
// stores a collection of objects
  {
  }

private:
  C container;
};
void f1() noexcept
{
  A a1{}; // Calls A::A()
  A a2{{}}; // Calls A::A(std::initializer_list<std::int32_t>)
  A a3{0, 1}; // Calls A::A(std::initializer_list<std::int32_t>)
  A a4(0, 1); // Calls A::A(std::int32_t, std::int32_t)
}
void f2() noexcept
{
  B b1{}; // Calls B::B()
  B b2{{}}; // Calls B::B(std::initializer_list<std::int32_t>)
  B b3{1, 2}; // Calls B::B(std::initializer_list<std::int32_t>)
  B b4(10, 0); // Calls B::B(std::int32_t, std::int32_t)
}
void f3() noexcept
{
  C c1{}; // Calls C::C()
  C c2{{}}; // Calls C::C(std::initializer_list<std::int32_t>)
  C c3{1, 2, 3}; // Calls C::C(std::initializer_list<std::int32_t>)
}
void f4() noexcept
{
  D d1{}; // Calls D::D()
  D d2{{}}; // Calls D::D(std::initializer_list<std::int32_t>)
  D d3{1, 2, 3}; // Calls D::D(std::initializer_list<std::int32_t>)
}
void f5() noexcept
{
  E e1{}; // Calls E::E()
  E e2{{}}; // Calls E::E(std::initializer_list<std::int32_t>)
  E e3{1, 2, 3}; // Calls E::E(std::initializer_list<std::int32_t>)
}
///end AUTOSAR
int start() { /// @{} for start
  f1();
  f2();
  f3();
  f4();
  f5();
  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 a8-5-4
$ clang++ a8-5-4.cpp -I./ -std=c++14 -Wall
Rule A8-5-4 (advisory, implementation, non-automated)A constructor taking parameter of type std::initializer_list shall only be defined in classes that internally store a collection of objects.(77)A8-5-4.cpp
$ clang++ a8-5-4.cpp  -I./ -std=c++17 -Wall
Rule A8-5-4 (advisory, implementation, non-automated)A constructor taking parameter of type std::initializer_list shall only be defined in classes that internally store a collection of objects.(77)A8-5-4.cpp
$ clang++ a8-5-4.cpp  -I./ -std=c++2a -Wall
Rule A8-5-4 (advisory, implementation, non-automated)A constructor taking parameter of type std::initializer_list shall only be defined in classes that internally store a collection of objects.(77)A8-5-4.cpp

$ g++-8 a8-5-4.cpp  -I./ -std=c++14  -Wall
Rule A8-5-4 (advisory, implementation, non-automated)A constructor taking parameter of type std::initializer_list shall only be defined in classes that internally store a collection of objects.(77)A8-5-4.cpp
$ g++-8 a8-5-4.cpp  -I./ -std=c++17  -Wall
Rule A8-5-4 (advisory, implementation, non-automated)A constructor taking parameter of type std::initializer_list shall only be defined in classes that internally store a collection of objects.(77)A8-5-4.cpp
$ g++-8 a8-5-4.cpp  -I./ -std=c++2a  -Wall
Rule A8-5-4 (advisory, implementation, non-automated)A constructor taking parameter of type std::initializer_list shall only be defined in classes that internally store a collection of objects.(77)A8-5-4.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
clang++警告なし, g++警告あり

###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

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