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@kaizen_nagoya(Dr. Kiyoshi Ogawa)

C++N4741(112)11.4.3 Deleted definitions [dcl.fct.def.delete]p195

Last updated at Posted at 2018-05-25

#はじめに(Introduction)
C++N4741 Working Draft, Standard for Programming Language C++
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4741.pdf

C++N4741は、ISO/IEC JTC1 SC22 WG21の作業原案(Working Draft)です。
公式のISO/IEC 14882原本ではありません。
ISO/IEC JTC1 SC22 WG21では、可能な限り作業文書を公開し、幅広い意見を求めています。
一連の記事はコード断片をコンパイルできる形にする方法を検討してコンパイル、リンク、実行して、規格案の原文と処理系(g++, Clang++)との違いを確認し、技術内容を検討し、ISO/IEC JTC1 SC22 WG21にフィードバックするために用います。
また、CERT C++, MISRA C++等のコーディング標準のコード断片をコンパイルする際の参考にさせていただこうと考えています。CERT C++, MISRA C++が標準化の動きとの時間的なずれがあれば確認できれば幸いです。また、boostライブラリとの関連、Linux OS, TOPPERSカーネル、g++(GCC), clang++(LLVM）との関係も調査中です。
何か、抜け漏れ、耳より情報がありましたらおしらせくださると幸いです。

##背景(back ground)
C/C++でコンパイルエラーが出ると、途方にくれることがしばしばあります。
何回かに１回は、該当するエラーが検索できます。
ただ、条件が違っていて、そこでの修正方法では目的を達成しないこともしばしばです。いろいろな条件のコンパイルエラーとその対応方法について、広く記録することによって、いつか同じエラーに遭遇した時にやくに立つことを目指しています。

この半年の間で、三度、自分のネットでの記録に助けられたことがあります。
また過去に解決できなかった記録を１０種類以上、最近になって解決できたことがあります。それは、主に次の4つの情報に基づいています。

https://stackoverflow.com
https://cpprefjp.github.io
http://ja.cppreference.com/
https://teratail.com/

また
https://researchmap.jp/joub9b3my-1797580/#_1797580
に記載したサイトのお世話になっています。

##作業方針(sequence)
Clang++では-std=c++03, c++17, C++2aの３種類
g++では-std=c++03, c++17の２種類
でコンパイルし、

１）コンパイルエラーを収集する。
２）コンパイルエラーをなくす方法を検討する。
コンパイルエラーになる例を示すだけが目的のコードは、コンパイルエラーをなくすのではなく、コンパイルエラーの種類を収集するだけにする。
文法を示すのが目的のコード場合に、コンパイルエラーをなくすのに手間がかかる場合は、順次作業します。
３）リンクエラーをなくす方法を検討する。
文法を示すのが目的のコード場合に、リンクエラーをなくすのに手間がかかる場合は、順次作業します。
４）意味のある出力を作る。
コンパイル、リンクが通っても、意味のある出力を示そうとすると、コンパイル・リンクエラーが出て収拾できそうにない場合がある。順次作業します。

１）だけのものから４）まで進んだものと色々ある状態です。一歩でも前に進むご助言をお待ちしています。「検討事項」の欄に現状を記録するようにしています。

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

##C++N4741, 2018 Standard Working Draft on ISO/IEC 14882 sample code compile list
https://qiita.com/kaizen_nagoya/items/3294c014044550896010

C++N4606, 2016符号断片編纂一覧(example code compile list)

C++N4606, 2016 Working Draft 2016, ISO/IEC 14882, C++ standard(1) Example code compile list
https://qiita.com/kaizen_nagoya/items/df5d62c35bd6ed1c3d43/

##C++N3242, 2011 sample code compile list on clang++ and g++
https://qiita.com/kaizen_nagoya/items/685b5c1a2c17c1bf1318

編纂器(Compiler)

###clang++ --version
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-apple-darwin17.4.0

###g++-7 --version
g++-7 (Homebrew GCC 7.3.0_1) 7.3.0
Copyright (C) 2017 Free Software Foundation, Inc.

#(112)11.4.3 Deleted definitions [dcl.fct.def.delete]p195
C++N4606(101) 8.4.3 Deleted definitions [dcl.fct.def.delete] p218
https://qiita.com/kaizen_nagoya/items/605c6a7d1a2dc14c753a

C++N3242, 2011 (83) 8.4.3 Deleted definitions
https://researchmap.jp/jouqm52jp-1797580/#_1797580

##p195.cpp
###算譜(source code)

p195.cpp
// C++N4741 Committee Draft, Standard for Programming Language C++
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n741.pdf
const char* msg= "C++N4741(112)11.4.3 Deleted definitions [dcl.fct.def.delete]p195.cpp";
// Edited by Dr. Ogawa Kiyoshi. Compile procedure and results record.

#include <iostream>
#include <cstdlib>

using namespace std;

struct onlydouble {
  onlydouble() = delete; // OK, but redundant
  onlydouble(std::intmax_t) = delete;
  onlydouble(double);
};

namespace N {
  struct sometype {
    void* operator new(std::size_t) = delete;
    void* operator new[](std::size_t) = delete;
  };
  sometype* p = new sometype; // error, deleted class operator new
  sometype* q = new sometype[3]; // error, deleted class operator new[]
}

namespace M {
  struct moveonly {
    moveonly() = default;
    moveonly(const moveonly&) = delete;
    moveonly(moveonly&&) = default;
    moveonly& operator=(const moveonly&) = delete;
    moveonly& operator=(moveonly&&) = default;
    ~moveonly() = default;
  };
  moveonly* p;
  moveonly q(*p); // error, deleted copy constructor
}

struct sometype {
  sometype();
};
sometype::sometype() = delete; // ill-formed; not first declaration

int main() {
  double d;
  onlydouble o(d);
  M::moveonly m ;
  cout << &m<<endl;
  cout<< msg << endl;
  return EXIT_SUCCESS;
}

###編纂・実行結果(compile and go)

cpla.sh
$ ../c1.sh p195
$ clang++ p195.cpp  -std=c++2a -Wall
p195.cpp:22:15: error: call to deleted function 'operator new'
sometype* p = new sometype; // error, deleted class operator new
              ^
p195.cpp:19:7: note: candidate function has been explicitly deleted
void* operator new(std::size_t) = delete;
      ^
p195.cpp:23:15: error: call to deleted function 'operator new[]'
sometype* q = new sometype[3]; // error, deleted class operator new[]
              ^
p195.cpp:20:7: note: candidate function has been explicitly deleted
void* operator new[](std::size_t) = delete;
      ^
p195.cpp:36:10: error: call to deleted constructor of 'M::moveonly'
moveonly q(*p); // error, deleted copy constructor
         ^ ~~
p195.cpp:29:1: note: 'moveonly' has been explicitly marked deleted here
moveonly(const moveonly&) = delete;
^
p195.cpp:42:11: error: redefinition of 'sometype'
sometype::sometype() = delete; // ill-formed; not first declaration
          ^
p195.cpp:40:1: note: previous definition is here
sometype(){cout <<"sometype"<<endl;}
^
p195.cpp:47:12: error: no matching constructor for initialization of 'sometype'
  sometype s;
           ^
p195.cpp:39:8: note: candidate constructor (the implicit copy constructor) not
      viable: requires 1 argument, but 0 were provided
struct sometype {
       ^
p195.cpp:39:8: note: candidate constructor (the implicit move constructor) not
      viable: requires 1 argument, but 0 were provided
5 errors generated.

##p195a.cpp
コンパイルエラーを想定していた行を///註釈に。

###算譜(source code)

p195a.cpp
// C++N4741 Committee Draft, Standard for Programming Language C++
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n741.pdf
const char* msg= "C++N4741(112)11.4.3 Deleted definitions [dcl.fct.def.delete]p195a.cpp";
// Edited by Dr. Ogawa Kiyoshi. Compile procedure and results record.

#include <iostream>
#include <cstdlib>

using namespace std;

struct onlydouble {
  onlydouble() = delete; // OK, but redundant
  onlydouble(std::intmax_t) = delete;
  onlydouble(double d) {
    cout<<"onlydouble="<<d<<endl;
  }
};

namespace N {
  struct sometype {
    void* operator new(std::size_t) = delete;
    void* operator new[](std::size_t) = delete;
  };
///sometype* p = new sometype; // error, deleted class operator new
///sometype* q = new sometype[3]; // error, deleted class operator new[]
}

namespace M {
  struct moveonly {
    moveonly() = default;
    moveonly(const moveonly&) = delete;
    moveonly(moveonly&&) = default;
    moveonly& operator=(const moveonly&) = delete;
    moveonly& operator=(moveonly&&) = default;
    ~moveonly() = default;
  };
  moveonly* p;
///moveonly q(*p); // error, deleted copy constructor
}

struct sometype {
  sometype() {
    cout <<"sometype"<<endl;
  }
};
///sometype::sometype() = delete; // ill-formed; not first declaration

int main() {
  double d;
  onlydouble o(d);
  sometype s;
  M::moveonly m ;
  cout << &m<<" s="<<&s<<endl;
  cout<< msg << endl;
  return EXIT_SUCCESS;
}

###編纂・実行結果(compile and go)

cpla.sh
$ ../cpla.sh p195
$ clang++ p195.cpp -std=c++03 -Wall
p195.cpp:12:16: warning: deleted function definitions are a C++11 extension
      [-Wc++11-extensions]
onlydouble() = delete; // OK, but redundant
               ^
p195.cpp:13:29: warning: deleted function definitions are a C++11 extension
      [-Wc++11-extensions]
onlydouble(std::intmax_t) = delete;
                            ^
p195.cpp:19:35: warning: deleted function definitions are a C++11 extension
      [-Wc++11-extensions]
void* operator new(std::size_t) = delete;
                                  ^
p195.cpp:20:37: warning: deleted function definitions are a C++11 extension
      [-Wc++11-extensions]
void* operator new[](std::size_t) = delete;
                                    ^
p195.cpp:28:14: warning: defaulted function definitions are a C++11 extension
      [-Wc++11-extensions]
moveonly() = default;
             ^
p195.cpp:29:29: warning: deleted function definitions are a C++11 extension
      [-Wc++11-extensions]
moveonly(const moveonly&) = delete;
                            ^
p195.cpp:30:18: warning: rvalue references are a C++11 extension
      [-Wc++11-extensions]
moveonly(moveonly&&) = default;
                 ^
p195.cpp:30:24: warning: defaulted function definitions are a C++11 extension
      [-Wc++11-extensions]
moveonly(moveonly&&) = default;
                       ^
p195.cpp:31:40: warning: deleted function definitions are a C++11 extension
      [-Wc++11-extensions]
moveonly& operator=(const moveonly&) = delete;
                                       ^
p195.cpp:32:29: warning: rvalue references are a C++11 extension
      [-Wc++11-extensions]
moveonly& operator=(moveonly&&) = default;
                            ^
p195.cpp:32:35: warning: defaulted function definitions are a C++11 extension
      [-Wc++11-extensions]
moveonly& operator=(moveonly&&) = default;
                                  ^
p195.cpp:33:15: warning: defaulted function definitions are a C++11 extension
      [-Wc++11-extensions]
~moveonly() = default;
              ^
p195.cpp:46:16: warning: variable 'd' is uninitialized when used here
      [-Wuninitialized]
  onlydouble o(d);
               ^
p195.cpp:45:11: note: initialize the variable 'd' to silence this warning
  double d;
          ^
           = 0.0
13 warnings generated.
onlydouble=0
sometype
0x7ffee3707708 s=0x7ffee3707710
C++N4741(112)11.4.3 Deleted definitions [dcl.fct.def.delete]p194.cpp
$ clang++ p195.cpp -std=c++2a -Wall
p195.cpp:46:16: warning: variable 'd' is uninitialized when used here
      [-Wuninitialized]
  onlydouble o(d);
               ^
p195.cpp:45:11: note: initialize the variable 'd' to silence this warning
  double d;
          ^
           = 0.0
1 warning generated.
onlydouble=0
sometype
0x7ffee0d3b708 s=0x7ffee0d3b710
C++N4741(112)11.4.3 Deleted definitions [dcl.fct.def.delete]p194.cpp

$ g++-8 p195.cpp -std=c++03  -Wall
p195.cpp:12:16: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11
 onlydouble() = delete; // OK, but redundant
                ^~~~~~
p195.cpp:13:11: warning: unnecessary parentheses in declaration of 'intmax_t' [-Wparentheses]
 onlydouble(std::intmax_t) = delete;
           ^
p195.cpp:13:29: error: invalid use of '::'
 onlydouble(std::intmax_t) = delete;
                             ^~~~~~
p195.cpp:19:35: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11
 void* operator new(std::size_t) = delete;
                                   ^~~~~~
p195.cpp:20:37: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11
 void* operator new[](std::size_t) = delete;
                                     ^~~~~~
p195.cpp:28:14: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11
 moveonly() = default;
              ^~~~~~~
p195.cpp:29:29: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11
 moveonly(const moveonly&) = delete;
                             ^~~~~~
p195.cpp:30:18: error: expected ',' or '...' before '&&' token
 moveonly(moveonly&&) = default;
                  ^~
p195.cpp:30:24: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11
 moveonly(moveonly&&) = default;
                        ^~~~~~~
p195.cpp:30:24: error: invalid constructor; you probably meant 'M::moveonly (const M::moveonly&)'
p195.cpp:31:40: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11
 moveonly& operator=(const moveonly&) = delete;
                                        ^~~~~~
p195.cpp:32:29: error: expected ',' or '...' before '&&' token
 moveonly& operator=(moveonly&&) = default;
                             ^~
p195.cpp:32:35: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11
 moveonly& operator=(moveonly&&) = default;
                                   ^~~~~~~
p195.cpp:33:15: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11
 ~moveonly() = default;
               ^~~~~~~
p195.cpp:32:11: error: defaulted declaration 'M::moveonly& M::moveonly::operator=(M::moveonly)' does not match the expected signature
 moveonly& operator=(moveonly&&) = default;
           ^~~~~~~~
p195.cpp:32:11: note: expected signature: 'M::moveonly& M::moveonly::operator=(M::moveonly&)'

$ g++-8 p195.cpp -std=c++2a  -Wall
p195.cpp: In function 'int main()':
p195.cpp:46:17: warning: 'd' is used uninitialized in this function [-Wuninitialized]
   onlydouble o(d);
                 ^
onlydouble=2.26176e-314
sometype
0x7ffee60c7745 s=0x7ffee60c7746
C++N4741(112)11.4.3 Deleted definitions [dcl.fct.def.delete]p194.cpp

#検討事項(agenda)
役に立つまたは意味のあるその他の出力

#参考資料(reference)

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

#文書履歴(document history)
ver. 0.10 初稿 20180525
ver. 0.11 章番号・頁番号訂正 20180526

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