Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(97)
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。

A12-7-1.cpp

算譜(source code)

A12-7-1.cpp

//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A12-7-1 (required, implementation, automated)If the behavior of a user-defined special member function is identical to implicitly defined special member function, then it shall be defined “=default” or be left undefined.(97)A12-7-1.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" is from AUTOSAR without code having /// comment in line.
// $Id: A12-7-1.cpp 271715 2017-03-23 10:13:51Z piotr.tanski $
# include <cstdint>
# include <utility>
class A
{
public:
  A() : x(0), y(0) {} // Compliant
  A(std::int32_t first, std::int32_t second) : x(first), y(second) {} //Compliant
// -
// a constructor
// cannot be
// defaulted.
  A(const A& oth)
    : x(oth.x),
      y(oth.y) // Non-compliant - equivalent to the implicitly
// defined copy constructor
  {
  }
  A(A&& oth)
    : x(std::move(oth.x)),
      y(std::move(
          oth.y)) // Non-compliant - equivalent to the implicitly
// defined move constructor
  {
  }
  ~A() // Non-compliant - equivalent to the implicitly defined destructor
  {
  }

private:
  std::int32_t x;
  std::int32_t y;
};
class B
{
public:
  B() {} // Non-compliant - x and y are not initialized
// should be replaced with: B() : x{0}, y{0} {}
  B(std::int32_t first, std::int32_t second) : x(first), y(second) {} //Compliant
  B(const B&) =
    default; // Compliant - equivalent to the copy constructor of class A
  B(B&&) =
    default; // Compliant - equivalent to the move constructor of class A
  ~B() = default; // Compliant - equivalent to the destructor of class A
  void f() {
    cout <<"x="<<x<<" y="<<y<<endl;
  }/// @ {} for output
private:
  std::int32_t x;
  std::int32_t y;
};
class C
{
public:
  C() = default; // Compliant
  C(const C&) = default; // Compliant
  C(C&&) = default; // Compliant
};
class D
{
public:
  D() : ptr(nullptr) {} // Compliant - this is not equivalent to what the
// implicitly defined default constructor would do
  D(C* p) : ptr(p) {
    cout << "p="<<p<<" ptr="<<ptr <<endl;/// @ line for output
  } // Compliant
  D(const D&) = default; // Shallow copy will be performed, user-defined copy
// constructor is needed to perform deep copy on ptr variable
  D(D&&) = default; // ptr variable will be moved, so ptr will still point to
// the same object
  ~D() = default; // ptr will not be deleted, the user-defined destructor is
// needed to delete allocated memory

private:
  C* ptr;
};
class E // Compliant - special member functions definitions are not needed as
// class E uses only implicit definitions
{
};
///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)

cpa.sh

$ ../cpa.sh a12-7-1
$ clang++ a12-7-1.cpp -I./ -std=c++14 -Wall
Rule A12-7-1 (required, implementation, automated)If the behavior of a user-defined special member function is identical to implicitly defined special member function, then it shall be defined “=default” or be left undefined.(97)A12-7-1.cpp
$ clang++ a12-7-1.cpp  -I./ -std=c++17 -Wall
Rule A12-7-1 (required, implementation, automated)If the behavior of a user-defined special member function is identical to implicitly defined special member function, then it shall be defined “=default” or be left undefined.(97)A12-7-1.cpp
$ clang++ a12-7-1.cpp  -I./ -std=c++2a -Wall
Rule A12-7-1 (required, implementation, automated)If the behavior of a user-defined special member function is identical to implicitly defined special member function, then it shall be defined “=default” or be left undefined.(97)A12-7-1.cpp

$ g++-8 a12-7-1.cpp  -I./ -std=c++14  -Wall
Rule A12-7-1 (required, implementation, automated)If the behavior of a user-defined special member function is identical to implicitly defined special member function, then it shall be defined “=default” or be left undefined.(97)A12-7-1.cpp
$ g++-8 a12-7-1.cpp  -I./ -std=c++17  -Wall
Rule A12-7-1 (required, implementation, automated)If the behavior of a user-defined special member function is identical to implicitly defined special member function, then it shall be defined “=default” or be left undefined.(97)A12-7-1.cpp
$ g++-8 a12-7-1.cpp  -I./ -std=c++2a  -Wall
Rule A12-7-1 (required, implementation, automated)If the behavior of a user-defined special member function is identical to implicitly defined special member function, then it shall be defined “=default” or be left undefined.(97)A12-7-1.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 20180611