Guidelines for the use of the C++14 language in critical and
safety-related systems Sample code compile list(44)
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。
#A5-2-2.cpp
##算譜(source code)
//Guidelines for the use of the C++14 language in critical and safety-related systems
const char* msg="Rule A5-2-2 (required, implementation, automated)Traditional C-style casts shall not be used.(44)A5-2-2.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
#include <cstdint>
using namespace std;/// @line add using
///start AUTOSAR: From here to the "///end AUTOSAR" is from AUTOSAR without code having /// comment in line.
// $Id: A5-2-2.cpp 271927 2017-03-24 12:01:35Z piotr.tanski $
#include <cstdint>
class C
{
public:
explicit C(std::int32_t) {}
virtual void fn() noexcept {}
};
class D : public C
{
public:
void fn() noexcept override {}
};
class E
{
};
std::int32_t g() noexcept
{
return 7;
}
void f() noexcept(false)
{
C a1 = C{10}; // Compliant
C* a2 = (C*)(&a1); // Non-compliant
const C a3(5);
C* a4 = const_cast<C*>(&a3); // Compliant - violates another rule
E* d1 = reinterpret_cast<E*>(a4); // Compliant - violates another rule
D* d2 = dynamic_cast<D*>(a2); // Compliant - violates another rule
std::int16_t x1 = 20;
std::int32_t x2 = static_cast<std::int32_t>(x1); // Compliant
std::int32_t x3 = (std::int32_t)x1; // Non-compliant
std::int32_t x4 = 10;
float f1 = static_cast<float>(x4); // Compliant
float f2 = (float)x4; // Non-compliant
std::int32_t x5 = static_cast<std::int32_t>(f1); // Compliant
std::int32_t x6 = (std::int32_t)f1; // Non-compliant
(void)g(); // Non-compliant
static_cast<void>(g()); // Compliant
cout << "x1="<<x1<<" x2="<<x2<<" x3="<<x3<<" x4="<<" x5="<<x5<<" x6="<<x6<<" f2="<<f2<<endl;
}
///end AUTOSAR
int start() { /// @{} for start
C c=C{10};
c.fn();
f();
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 a5-2-2
$ clang++ a5-2-2.cpp -I./ -std=c++14 -Wall
a5-2-2.cpp:42:5: warning: unused variable 'd2' [-Wunused-variable]
D* d2 = dynamic_cast<D*>(a2); // Compliant - violates another rule
^
a5-2-2.cpp:41:5: warning: unused variable 'd1' [-Wunused-variable]
E* d1 = reinterpret_cast<E*>(a4); // Compliant - violates another rule
^
2 warnings generated.
x1=20 x2=20 x3=20 x4= x5=10 x6=10 f2=10
Rule A5-2-2 (required, implementation, automated)Traditional C-style casts shall not be used.(44)A5-2-2.cpp
$ clang++ a5-2-2.cpp -I./ -std=c++17 -Wall
a5-2-2.cpp:42:5: warning: unused variable 'd2' [-Wunused-variable]
D* d2 = dynamic_cast<D*>(a2); // Compliant - violates another rule
^
a5-2-2.cpp:41:5: warning: unused variable 'd1' [-Wunused-variable]
E* d1 = reinterpret_cast<E*>(a4); // Compliant - violates another rule
^
2 warnings generated.
x1=20 x2=20 x3=20 x4= x5=10 x6=10 f2=10
Rule A5-2-2 (required, implementation, automated)Traditional C-style casts shall not be used.(44)A5-2-2.cpp
$ clang++ a5-2-2.cpp -I./ -std=c++2a -Wall
a5-2-2.cpp:41:5: warning: unused variable 'd1' [-Wunused-variable]
E* d1 = reinterpret_cast<E*>(a4); // Compliant - violates another rule
^
a5-2-2.cpp:42:5: warning: unused variable 'd2' [-Wunused-variable]
D* d2 = dynamic_cast<D*>(a2); // Compliant - violates another rule
^
2 warnings generated.
x1=20 x2=20 x3=20 x4= x5=10 x6=10 f2=10
Rule A5-2-2 (required, implementation, automated)Traditional C-style casts shall not be used.(44)A5-2-2.cpp
$ g++-8 a5-2-2.cpp -I./ -std=c++14 -Wall
a5-2-2.cpp: In function 'void f()':
a5-2-2.cpp:41:5: warning: unused variable 'd1' [-Wunused-variable]
E* d1 = reinterpret_cast<E*>(a4); // Compliant - violates another rule
^~
a5-2-2.cpp:42:5: warning: unused variable 'd2' [-Wunused-variable]
D* d2 = dynamic_cast<D*>(a2); // Compliant - violates another rule
^~
x1=20 x2=20 x3=20 x4= x5=10 x6=10 f2=10
Rule A5-2-2 (required, implementation, automated)Traditional C-style casts shall not be used.(44)A5-2-2.cpp
$ g++-8 a5-2-2.cpp -I./ -std=c++17 -Wall
a5-2-2.cpp: In function 'void f()':
a5-2-2.cpp:41:5: warning: unused variable 'd1' [-Wunused-variable]
E* d1 = reinterpret_cast<E*>(a4); // Compliant - violates another rule
^~
a5-2-2.cpp:42:5: warning: unused variable 'd2' [-Wunused-variable]
D* d2 = dynamic_cast<D*>(a2); // Compliant - violates another rule
^~
x1=20 x2=20 x3=20 x4= x5=10 x6=10 f2=10
Rule A5-2-2 (required, implementation, automated)Traditional C-style casts shall not be used.(44)A5-2-2.cpp
$ g++-8 a5-2-2.cpp -I./ -std=c++2a -Wall
a5-2-2.cpp: In function 'void f()':
a5-2-2.cpp:41:5: warning: unused variable 'd1' [-Wunused-variable]
E* d1 = reinterpret_cast<E*>(a4); // Compliant - violates another rule
^~
a5-2-2.cpp:42:5: warning: unused variable 'd2' [-Wunused-variable]
D* d2 = dynamic_cast<D*>(a2); // Compliant - violates another rule
^~
x1=20 x2=20 x3=20 x4= x5=10 x6=10 f2=10
Rule A5-2-2 (required, implementation, automated)Traditional C-style casts shall not be used.(44)A5-2-2.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)
###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 0.11 一覧追記 参考文献欄追記 20180616
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