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Effective C++ Third version, sample code compile list(6) Explicitly disallow the use of compiler generated functions you do not want.

Last updated at Posted at 2018-06-22

Effective C++: 55 Specific Ways to Improve Your Programs and DesignsThird version by Scott Mayers
https://www.informit.com/store/effective-c-plus-plus-55-specific-ways-to-improve-your-9780321334879
https://www.amazon.com/dp/0321334876

Sample code from
Yuzhen11/Effective_CPP
https://github.com/Yuzhen11/Effective_CPP
#目的(purpose)

"Effective C++コンパイル記録は、コンパイラおよび対応標準により、コンパイルエラーMessageの違いを記録し、どのエラーが出たら、どの対応標準にすればエラーが少なくなるかを考察するための資料の第一歩です。
上記参照サイトにはコンパイルする仕組みを提供していない。簡易な台本(script)を作成する。

#成果(outcome)

##計画(plan)
(1)コンパイラの種類、対応標準の違いによってエラーの数が違う。
(2)同じエラー、警告であってもMessageの表現が違う。
(3) エラー、警告のMessageをネットで検索する際に役立てる。
(4)コード断片の役に立つまたは意味のあるコンパイル・リンク・実行エラーの取り方を検討する
(5)コード断片の役に立つまたは意味のある出力を検討する
##結果(result)現在整理中

  1. コンパイラによるエラー、渓谷の違い
  2. コンパイラによる必要なヘッダファイルの違い
  3. 参考にした資料

#算譜(source code)

ec6.cpp
///Effective C++:  55 Specific Ways to Improve Your Programs and DesignsThird version by Scott Mayers
///https://www.informit.com/store/effective-c-plus-plus-55-specific-ways-to-improve-your-9780321334879
#include <iostream>
#include <cstdlib>

using namespace std;

const char * msg ="Item 6: Explicitly disallow the use of compiler generated functions you do not want.";

/// From here "Effective C++

//Ways to prevent object to be copied.

namespace A {
  class HomeForSale {
///...
  };
  HomeForSale h1;
  HomeForSale h2;

  HomeForSale h3(h1);  // should not compile
  void h() {
    h1 = h2;  // should not compile
  }
}
//Solution 1: Make it private and no definition

namespace B {
  class HomeForSale {
  public:
///  ....
  private:
    HomeForSale(const HomeForSale&);  // declare only
    HomeForSale& operator=(const HomeForSale&);
  };
}

//Compiler will prevent the copy intention and linker will complain if you try to invoke them in a member or a friend function.

//Solutoin2: Inherit from uncopyable baseclass

class Uncopyable {
protected:
  Uncopyable() {}  // allow constructoin and destuction of derived objects....
  ~Uncopyable() {}
private:
  Uncopyable(const Uncopyable&);   // but prevent copying
  Uncopyable& operator=(const Uncopyable&);
};

class HomeForSale:private Uncopyable {
};
//The compiler-generated copy operations will try to call their base class couterparts, and those calls will be rejected, becasue the copying operations are private in the base class.

//In C++11, we may use delete functoin.

//Things to Remember

//To disallow functoinality automatically provided by compilers, declare the corresponding member functions private and give no implementations. Using base class like Uncopyable is one way to do this.

/// to here from "Effective C++"

int main() {
  A::h();
  cout << msg << endl;
  return EXIT_SUCCESS;
}

#編纂・実行結果(compile and go)

cpa.sh
$ ../cpa.sh ec6
$ clang++ ec6.cpp -I./ -std=c++14 -Wall
Item 6: Explicitly disallow the use of compiler generated functions you do not want.
$ clang++ ec6.cpp  -I./ -std=c++17 -Wall
Item 6: Explicitly disallow the use of compiler generated functions you do not want.
$ clang++ ec6.cpp  -I./ -std=c++2a -Wall
Item 6: Explicitly disallow the use of compiler generated functions you do not want.

$ g++-8 ec6.cpp  -I./ -std=c++14  -Wall
Item 6: Explicitly disallow the use of compiler generated functions you do not want.
$ g++-8 ec6.cpp  -I./ -std=c++17  -Wall
Item 6: Explicitly disallow the use of compiler generated functions you do not want.
$ g++-8 ec6.cpp  -I./ -std=c++2a  -Wall
Item 6: Explicitly disallow the use of compiler generated functions you do not want.

#課題(agenda)

1)役に立つまたは意味のある出力

2)役に立つまたは意味のある関数、クラスの呼び出し方

参考資料(reference)

Effective C++(項6〜10)解説
https://qiita.com/MoriokaReimen/items/bf301530e8f5d6d2fe90
Effective C++ Third version, sample code compile list(まとめ)
https://qiita.com/kaizen_nagoya/items/2092638c221e1033040c

docker gnu(gcc/g++) and llvm(clang/clang++)
https://qiita.com/drafts/059874ea39c4de64c0f7
[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
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
Clang/Clang++(LLVM) gcc/g++(GNU) コンパイラ警告等比較
https://qiita.com/kaizen_nagoya/items/9a82b958cc3aeef0403f
C++2003とC++2017でコンパイルエラーになるならない事例集
https://qiita.com/kaizen_nagoya/items/a13ea3823441c430edff
Qiitaに投稿するCのStyle例(暫定)
https://qiita.com/kaizen_nagoya/items/946df1528a6a1ef2bc0d
cpprefjpのdecltypeをコンパイル試験
https://qiita.com/kaizen_nagoya/items/090909af702f0d5d8a67
MISRA C++ 5-0-16
https://qiita.com/kaizen_nagoya/items/7df2d4e05db724752a74
C++ Templates Part1 BASICS Chapter 3. Class Templates 3.2 Use of Class Template Stack stack1test.cpp
https://qiita.com/kaizen_nagoya/items/cd5fc49106fad5a4e9ed
ISO/IEC TS 17961:2013 C Secure Coding Rules(1) All list(to be confirmed)
https://qiita.com/kaizen_nagoya/items/54e056195c4f11b850a1
C言語(C++)に対する誤解、曲解、無理解、爽快。
https://qiita.com/kaizen_nagoya/items/3f3992c9722c1cee2e3a
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
'wchar.h' file not found で困った clang++ macOS
https://qiita.com/kaizen_nagoya/items/de15cd46d657517fac11
Open POSIX Test Suiteの使い方を調べはじめました
https://qiita.com/kaizen_nagoya/items/644d5e407f5faf96e6dc
MISRA-C 2012 Referenceに掲載している文献の入手可能性を確認
https://qiita.com/kaizen_nagoya/items/96dc8b125e462d5575bb
どうやって MISRA Example Suiteをコンパイルするか
https://qiita.com/kaizen_nagoya/items/fbdbff5ff696e2ca7f00
MISRA C まとめ #include
https://qiita.com/kaizen_nagoya/items/f1a79a7cbd281607c7c9
「C++完全理解ガイド」の同意できること上位10
https://qiita.com/kaizen_nagoya/items/aa5744e0c4a8618c7671
C++参考資料一覧
https://researchmap.jp/joub9b3my-1797580/#_1797580

文書履歴(document history)

ver. 0.10 初稿 20180622
ver. 0.11 参考文献追記 20180623

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