17.6.2 Header <new> synopsis [new.syn] C++N4910:2022 (281) p513.cpp

# はじめに(Introduction)

N4910  Working Draft, Standard for Programming Language C++

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/n4910.pdf

n4910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。

 <この項は書きかけです。順次追記します。>

## 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３つの情報に基づいています。

https://stackoverflow.com
https://cpprefjp.github.io
http://ja.cppreference.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++2bの2種類
g++では-std=c++03, c++2b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。

### C++N4910:2022 Standard Working Draft on ISO/IEC 14882(0) sample code compile list  

https://qiita.com/kaizen_nagoya/items/fc957ddddd402004bb91

### 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
> Debian clang version 14.0.5-++20220610033153+c12386ae247c-1~exp1~20220610153237.151
Target: x86_64-pc-linux-gnu, Thread model: posix, InstalledDir: /usr/bin

### g++- --version
> g++ (GCC) 12.1.0  Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# 17.6.2 Header <new> synopsis [new.syn] C++N4910:2022 (281) p513.cpp

## 算譜(source code)

```c++:p513.cpp
// C++N4910 Committee Draft, Standard for Programming Language C++
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/n4910.pdf
const char * n4910 = "17.6.2 Header <new> synopsis [new.syn] C++N4910:2022 (281) p513.cpp";
// Debian clang version 14.0.5-++20220610033153+c12386ae247c-
// g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc.
// Edited by Dr. OGAWA Kiyoshi. Compile procedure and results record.
// C++N4910:2022 Standard Working Draft on ISO/IEC 14882(0) sample code compile list
// https://qiita.com/kaizen_nagoya/items/fc957ddddd402004bb91

#include <iostream>
#include <cstdio>
#include <cstdlib> 
#include <cstring>
#include <cassert>
#include <coroutine>
#include <vector>
#include <complex>
#include <map>
#include <atomic>
#include <unordered_map>
#include <typeinfo>
#include <new>

using namespace std;

// Example 1  
 namespace std {
// 17.6.4, storage allocation errors class bad_alloc;
class bad_array_new_length;
    struct destroying_delete_t {
      explicit destroying_delete_t() = default;
    };
    inline constexpr destroying_delete_t destroying_delete{};
// global operator new control
enum class align_val_t : size_t {};
    struct nothrow_t { explicit nothrow_t() = default; };
    extern const nothrow_t nothrow;
    using new_handler = void (*)();
    new_handler get_new_handler() noexcept;
    new_handler set_new_handler(new_handler new_p) noexcept;
// 17.6.5, pointer optimization barrier
template<class T> [[nodiscard]] constexpr T* launder(T* p) noexcept;
// 17.6.6, hardware interference size
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
}
// 17.6.3, storage allocation and deallocation
[[nodiscard]] void* operator new(std::size_t size);
[[nodiscard]] void* operator new(std::size_t size, std::align_val_t alignment); [[nodiscard]] void* operator new(std::size_t size, const std::nothrow_t&) noexcept; [[nodiscard]] void* operator new(std::size_t size, std::align_val_t alignment,
                                   const std::nothrow_t&) noexcept;
  void  operator delete(void* ptr) noexcept;
  void  operator delete(void* ptr, std::size_t size) noexcept;
  void  operator delete(void* ptr, std::align_val_t alignment) noexcept;
  void  operator delete(void* ptr, std::size_t size, std::align_val_t alignment) noexcept;
  void  operator delete(void* ptr, const std::nothrow_t&) noexcept;
  void  operator delete(void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept;
  [[nodiscard]] void* operator new[](std::size_t size);
  [[nodiscard]] void* operator new[](std::size_t size, std::align_val_t alignment);
  [[nodiscard]] void* operator new[](std::size_t size, const std::nothrow_t&) noexcept;
  [[nodiscard]] void* operator new[](std::size_t size, std::align_val_t alignment,
const std::nothrow_t&) noexcept;
void  operator delete[](void* ptr) noexcept;
void  operator delete[](void* ptr, std::size_t size) noexcept;
void  operator delete[](void* ptr, std::align_val_t alignment) noexcept;
void  operator delete[](void* ptr, std::size_t size, std::align_val_t alignment) noexcept;
void  operator delete[](void* ptr, const std::nothrow_t&) noexcept;
void  operator delete[](void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept;
  [[nodiscard]] void* operator new  (std::size_t size, void* ptr) noexcept;
  [[nodiscard]] void* operator new[](std::size_t size, void* ptr) noexcept;
  void  operator delete  (void* ptr, void*) noexcept;
  void  operator delete[](void* ptr, void*) noexcept;
int main(){
  cout  <<  n4910 << endl;
  return EXIT_SUCCESS;
}
```

## Script

```bash:clgc.sh
#!/bin/sh
rm $1l
rm $1g
echo "$ clang++ $1.cpp -std=03 -o $1l -I. -Wall" 
clang++ $1.cpp -std=c++03 -o $1l -I. -Wall
if [  -e $1l ]; then
./$1l 
fi
rm $1l
echo "$ clang++ $1.cpp -std=2b -o $1l -I. -Wall"
clang++ $1.cpp -std=c++2b -o $1l -I. -Wall
if [  -e $1l ]; then
./$1l
fi
echo "\r"
echo "$ g++ $1.cpp -std=03 -o $1g -I. -Wall"
g++ $1.cpp -std=c++03 -o $1g -I. -Wall
if [ -e $1g ]; then
./$1g
fi
rm $1g
echo "\r"
echo "$ g++ $1.cpp -std=2b -o $1g -I. -Wall"
g++ $1.cpp -std=c++2b -o $1g -I. -Wall
if [ -e $1g ]; then
./$1g 
fi
```
## 編纂・実行結果(compile and go)

```ubuntu:bash
 ./clgc.sh p513
$ clang++ p513.cpp -std=c++03 -o p513l -I. -Wall
In file included from p513.cpp:19:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/atomic:38:
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/c++0x_warning.h:32:2: error: This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
#error This file requires compiler and library support \
 ^
p513.cpp:31:40: warning: defaulted function definitions are a C++11 extension [-Wc++11-extensions]
      explicit destroying_delete_t() = default;
                                       ^
p513.cpp:33:12: error: unknown type name 'constexpr'
    inline constexpr destroying_delete_t destroying_delete{};
           ^
p513.cpp:33:5: warning: inline variables are a C++17 extension [-Wc++17-extensions]
    inline constexpr destroying_delete_t destroying_delete{};
    ^
p513.cpp:33:41: error: expected ';' after top level declarator
    inline constexpr destroying_delete_t destroying_delete{};
                                        ^
                                        ;
p513.cpp:35:6: warning: scoped enumerations are a C++11 extension [-Wc++11-extensions]
enum class align_val_t : size_t {};
     ^
p513.cpp:36:12: error: redefinition of 'nothrow_t'
    struct nothrow_t { explicit nothrow_t() = default; };
           ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/new:92:10: note: previous definition is here
  struct nothrow_t
         ^
p513.cpp:38:25: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
    using new_handler = void (*)();
                        ^
p513.cpp:39:35: error: expected function body after function declarator
    new_handler get_new_handler() noexcept;
                                  ^
p513.cpp:40:52: error: expected function body after function declarator
    new_handler set_new_handler(new_handler new_p) noexcept;
                                                   ^
p513.cpp:42:20: error: expected expression
template<class T> [[nodiscard]] constexpr T* launder(T* p) noexcept;
                   ^
p513.cpp:42:33: error: C++ requires a type specifier for all declarations
template<class T> [[nodiscard]] constexpr T* launder(T* p) noexcept;
                                ^
p513.cpp:42:33: warning: variable templates are a C++14 extension [-Wc++14-extensions]
p513.cpp:42:42: error: expected ';' at end of declaration
template<class T> [[nodiscard]] constexpr T* launder(T* p) noexcept;
                                         ^
                                         ;
p513.cpp:42:43: error: unknown type name 'T'
template<class T> [[nodiscard]] constexpr T* launder(T* p) noexcept;
                                          ^
p513.cpp:42:54: error: unknown type name 'T'
template<class T> [[nodiscard]] constexpr T* launder(T* p) noexcept;
                                                     ^
p513.cpp:42:60: error: expected function body after function declarator
template<class T> [[nodiscard]] constexpr T* launder(T* p) noexcept;
                                                           ^
p513.cpp:44:8: error: unknown type name 'constexpr'
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
       ^
p513.cpp:44:1: warning: inline variables are a C++17 extension [-Wc++17-extensions]
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
^
p513.cpp:44:24: error: expected ';' after top level declarator
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
                       ^
                       ;
p513.cpp:44:97: error: unknown type name 'constexpr'
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
                                                                                                ^
p513.cpp:44:90: warning: inline variables are a C++17 extension [-Wc++17-extensions]
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
                                                                                         ^
p513.cpp:44:113: error: expected ';' after top level declarator
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
                                                                                                                ^
                                                                                                                ;
p513.cpp:47:2: error: expected expression
[[nodiscard]] void* operator new(std::size_t size);
 ^
p513.cpp:47:15: error: expected unqualified-id
[[nodiscard]] void* operator new(std::size_t size);
              ^
p513.cpp:48:2: error: expected expression
[[nodiscard]] void* operator new(std::size_t size, std::align_val_t alignment); [[nodiscard]] void* operator new(std::size_t size, const std::nothrow_t&) noexcept; [[nodiscard]] void* operator new(std::size_t size, std::align_val_t alignment,
 ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
7 warnings and 20 errors generated.
rm: cannot remove 'p513l': No such file or directory
$ clang++ p513.cpp -std=c++2b -o p513l -I. -Wall
p513.cpp:30:12: error: redefinition of 'destroying_delete_t'
    struct destroying_delete_t {
           ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/new:217:10: note: previous definition is here
  struct destroying_delete_t
         ^
p513.cpp:33:42: error: redefinition of 'destroying_delete'
    inline constexpr destroying_delete_t destroying_delete{};
                                         ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/new:222:40: note: previous definition is here
  inline constexpr destroying_delete_t destroying_delete{};
                                       ^
p513.cpp:35:12: error: redefinition of 'align_val_t'
enum class align_val_t : size_t {};
           ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/new:89:14: note: previous definition is here
  enum class align_val_t: size_t {};
             ^
p513.cpp:36:12: error: redefinition of 'nothrow_t'
    struct nothrow_t { explicit nothrow_t() = default; };
           ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/new:92:10: note: previous definition is here
  struct nothrow_t
         ^
p513.cpp:44:66: error: use of undeclared identifier 'implementation'
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
                                                                 ^
p513.cpp:44:81: error: use of undeclared identifier 'defined'
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
                                                                                ^
p513.cpp:44:156: error: use of undeclared identifier 'implementation'
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
                                                                                                                                                           ^
p513.cpp:44:171: error: use of undeclared identifier 'defined'
inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
                                                                                                                                                                          ^
8 errors generated.

$ g++ p513.cpp -std=c++03 -o p513g -I. -Wall
In file included from /usr/local/include/c++/12.1.0/atomic:38,
                 from p513.cpp:19:
/usr/local/include/c++/12.1.0/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
   32 | #error This file requires compiler and library support \
      |  ^~~~~
p513.cpp:33:12: warning: identifier 'constexpr' is a keyword in C++11 [-Wc++11-compat]
   33 |     inline constexpr destroying_delete_t destroying_delete{};
      |            ^~~~~~~~~
p513.cpp:39:35: warning: identifier 'noexcept' is a keyword in C++11 [-Wc++11-compat]
   39 |     new_handler get_new_handler() noexcept;
      |                                   ^~~~~~~~
p513.cpp:31:40: warning: defaulted and deleted functions only available with '-std=c++11' or '-std=gnu++11' [-Wc++11-extensions]
   31 |       explicit destroying_delete_t() = default;
      |                                        ^~~~~~~
p513.cpp:33:12: error: 'constexpr' does not name a type
   33 |     inline constexpr destroying_delete_t destroying_delete{};
      |            ^~~~~~~~~
p513.cpp:33:12: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p513.cpp:35:1: warning: scoped enums only available with '-std=c++11' or '-std=gnu++11' [-Wc++11-extensions]
   35 | enum class align_val_t : size_t {};
      | ^~~~
p513.cpp:35:26: warning: scoped enums only available with '-std=c++11' or '-std=gnu++11' [-Wc++11-extensions]
   35 | enum class align_val_t : size_t {};
      |                          ^~~~~~
p513.cpp:36:12: error: redefinition of 'struct std::nothrow_t'
   36 |     struct nothrow_t { explicit nothrow_t() = default; };
      |            ^~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/bits/new_allocator.h:34,
                 from /usr/local/include/c++/12.1.0/x86_64-linux-gnu/bits/c++allocator.h:33,
                 from /usr/local/include/c++/12.1.0/bits/allocator.h:46,
                 from /usr/local/include/c++/12.1.0/string:41,
                 from /usr/local/include/c++/12.1.0/bits/locale_classes.h:40,
                 from /usr/local/include/c++/12.1.0/bits/ios_base.h:41,
                 from /usr/local/include/c++/12.1.0/ios:42,
                 from /usr/local/include/c++/12.1.0/ostream:38,
                 from /usr/local/include/c++/12.1.0/iostream:39,
                 from p513.cpp:10:
/usr/local/include/c++/12.1.0/new:92:10: note: previous definition of 'struct std::nothrow_t'
   92 |   struct nothrow_t
      |          ^~~~~~~~~
p513.cpp:38:11: error: expected nested-name-specifier before 'new_handler'
   38 |     using new_handler = void (*)();
      |           ^~~~~~~~~~~
p513.cpp:39:35: error: expected initializer before 'noexcept'
   39 |     new_handler get_new_handler() noexcept;
      |                                   ^~~~~~~~
p513.cpp:40:52: error: expected initializer before 'noexcept'
   40 |     new_handler set_new_handler(new_handler new_p) noexcept;
      |                                                    ^~~~~~~~
p513.cpp:42:19: error: expected unqualified-id before '[' token
   42 | template<class T> [[nodiscard]] constexpr T* launder(T* p) noexcept;
      |                   ^
p513.cpp:44:8: error: 'constexpr' does not name a type
   44 | inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
      |        ^~~~~~~~~
p513.cpp:44:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p513.cpp:44:97: error: 'constexpr' does not name a type
   44 | line constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
      |                                                                                               ^~~~~~~~~

p513.cpp:44:97: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p513.cpp:47:1: error: expected unqualified-id before '[' token
   47 | [[nodiscard]] void* operator new(std::size_t size);
      | ^
p513.cpp:48:1: error: expected unqualified-id before '[' token
   48 | [[nodiscard]] void* operator new(std::size_t size, std::align_val_t alignment); [[nodiscard]] void* operator new(std::size_t size, const std::nothrow_t&) noexcept; [[nodiscard]] void* operator new(std::size_t size, std::align_val_t alignment,
      | ^
p513.cpp:48:81: error: expected unqualified-id before '[' token
   48 | [[nodiscard]] void* operator new(std::size_t size, std::align_val_t alignment); [[nodiscard]] void* operator new(std::size_t size, const std::nothrow_t&) noexcept; [[nodiscard]] void* operator new(std::size_t size, std::align_val_t alignment,
      |                                                                                 ^
p513.cpp:48:165: error: expected unqualified-id before '[' token
   48 | ignment); [[nodiscard]] void* operator new(std::size_t size, const std::nothrow_t&) noexcept; [[nodiscard]] void* operator new(std::size_t size, std::align_val_t alignment,
      |                                                                                               ^

p513.cpp:50:36: error: expected initializer before 'noexcept'
   50 |   void  operator delete(void* ptr) noexcept;
      |                                    ^~~~~~~~
p513.cpp:51:54: error: expected initializer before 'noexcept'
   51 |   void  operator delete(void* ptr, std::size_t size) noexcept;
      |                                                      ^~~~~~~~
p513.cpp:52:64: error: expected initializer before 'noexcept'
   52 |   void  operator delete(void* ptr, std::align_val_t alignment) noexcept;
      |                                                                ^~~~~~~~
p513.cpp:53:82: error: expected initializer before 'noexcept'
   53 |   void  operator delete(void* ptr, std::size_t size, std::align_val_t alignment) noexcept;
      |                                                                                  ^~~~~~~~
p513.cpp:54:59: error: expected initializer before 'noexcept'
   54 |   void  operator delete(void* ptr, const std::nothrow_t&) noexcept;
      |                                                           ^~~~~~~~
p513.cpp:55:87: error: expected initializer before 'noexcept'
   55 |   void  operator delete(void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept;
      |                                                                                       ^~~~~~~~
p513.cpp:56:3: error: expected unqualified-id before '[' token
   56 |   [[nodiscard]] void* operator new[](std::size_t size);
      |   ^
p513.cpp:57:3: error: expected unqualified-id before '[' token
   57 |   [[nodiscard]] void* operator new[](std::size_t size, std::align_val_t alignment);
      |   ^
p513.cpp:58:3: error: expected unqualified-id before '[' token
   58 |   [[nodiscard]] void* operator new[](std::size_t size, const std::nothrow_t&) noexcept;
      |   ^
p513.cpp:59:3: error: expected unqualified-id before '[' token
   59 |   [[nodiscard]] void* operator new[](std::size_t size, std::align_val_t alignment,
      |   ^
p513.cpp:61:36: error: expected initializer before 'noexcept'
   61 | void  operator delete[](void* ptr) noexcept;
      |                                    ^~~~~~~~
p513.cpp:62:54: error: expected initializer before 'noexcept'
   62 | void  operator delete[](void* ptr, std::size_t size) noexcept;
      |                                                      ^~~~~~~~
p513.cpp:63:64: error: expected initializer before 'noexcept'
   63 | void  operator delete[](void* ptr, std::align_val_t alignment) noexcept;
      |                                                                ^~~~~~~~
p513.cpp:64:82: error: expected initializer before 'noexcept'
   64 | void  operator delete[](void* ptr, std::size_t size, std::align_val_t alignment) noexcept;
      |                                                                                  ^~~~~~~~
p513.cpp:65:59: error: expected initializer before 'noexcept'
   65 | void  operator delete[](void* ptr, const std::nothrow_t&) noexcept;
      |                                                           ^~~~~~~~
p513.cpp:66:87: error: expected initializer before 'noexcept'
   66 | void  operator delete[](void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept;
      |                                                                                       ^~~~~~~~
p513.cpp:67:3: error: expected unqualified-id before '[' token
   67 |   [[nodiscard]] void* operator new  (std::size_t size, void* ptr) noexcept;
      |   ^
p513.cpp:68:3: error: expected unqualified-id before '[' token
   68 |   [[nodiscard]] void* operator new[](std::size_t size, void* ptr) noexcept;
      |   ^
p513.cpp:69:45: error: expected initializer before 'noexcept'
   69 |   void  operator delete  (void* ptr, void*) noexcept;
      |                                             ^~~~~~~~
p513.cpp:70:45: error: expected initializer before 'noexcept'
   70 |   void  operator delete[](void* ptr, void*) noexcept;
      |                                             ^~~~~~~~
rm: cannot remove 'p513g': No such file or directory

$ g++ p513.cpp -std=c++2b -o p513g -I. -Wall
p513.cpp:30:12: error: redefinition of 'struct std::destroying_delete_t'
   30 |     struct destroying_delete_t {
      |            ^~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/bits/exception_ptr.h:40,
                 from /usr/local/include/c++/12.1.0/exception:168,
                 from /usr/local/include/c++/12.1.0/ios:39,
                 from /usr/local/include/c++/12.1.0/ostream:38,
                 from /usr/local/include/c++/12.1.0/iostream:39,
                 from p513.cpp:10:
/usr/local/include/c++/12.1.0/new:223:10: note: previous definition of 'struct std::destroying_delete_t'
  223 |   struct destroying_delete_t
      |          ^~~~~~~~~~~~~~~~~~~
p513.cpp:33:42: error: redefinition of 'constexpr const std::destroying_delete_t std::destroying_delete'
   33 |     inline constexpr destroying_delete_t destroying_delete{};
      |                                          ^~~~~~~~~~~~~~~~~
/usr/local/include/c++/12.1.0/new:228:40: note: 'constexpr const std::destroying_delete_t std::destroying_delete' previously defined here
  228 |   inline constexpr destroying_delete_t destroying_delete{};
      |                                        ^~~~~~~~~~~~~~~~~
p513.cpp:35:12: error: multiple definition of 'enum class std::align_val_t'
   35 | enum class align_val_t : size_t {};
      |            ^~~~~~~~~~~
/usr/local/include/c++/12.1.0/new:89:14: note: previous definition here
   89 |   enum class align_val_t: size_t {};
      |              ^~~~~~~~~~~
p513.cpp:36:12: error: redefinition of 'struct std::nothrow_t'
   36 |     struct nothrow_t { explicit nothrow_t() = default; };
      |            ^~~~~~~~~
/usr/local/include/c++/12.1.0/new:92:10: note: previous definition of 'struct std::nothrow_t'
   92 |   struct nothrow_t
      |          ^~~~~~~~~
p513.cpp:44:25: error: redefinition of 'constexpr const std::size_t std::hardware_destructive_interference_size'
   44 | inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/c++/12.1.0/new:212:27: note: 'constexpr const std::size_t std::hardware_destructive_interference_size' previously defined here
  212 |   inline constexpr size_t hardware_destructive_interference_size = __GCC_DESTRUCTIVE_SIZE;
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
p513.cpp:44:66: error: 'implementation' was not declared in this scope
   44 | inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
      |                                                                  ^~~~~~~~~~~~~~
p513.cpp:44:81: error: 'defined' was not declared in this scope
   44 | inline constexpr size_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
      |                                                                                 ^~~~~~~
p513.cpp:44:114: error: redefinition of 'constexpr const std::size_t std::hardware_constructive_interference_size'
   44 | ze_t hardware_destructive_interference_size = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
      |                                                                                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

/usr/local/include/c++/12.1.0/new:213:27: note: 'constexpr const std::size_t std::hardware_constructive_interference_size' previously defined here
  213 |   inline constexpr size_t hardware_constructive_interference_size = __GCC_CONSTRUCTIVE_SIZE;
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
p513.cpp:44:156: error: 'implementation' was not declared in this scope
   44 | e = implementation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
      |                                                                                               ^~~~~~~~~~~~~~

p513.cpp:44:171: error: 'defined' was not declared in this scope
   44 | tation-defined; inline constexpr size_t hardware_constructive_interference_size = implementation-defined;
      |                                                                                                  ^~~~~~~


```

## 検討事項(agenda)
コンパイルエラーを取るか、コンパイルエラーの理由を解説する。

<!-- リンクエラーの解説をする。clang++とg++の比較。意味のある出力。
コンパイルエラーを取るか、コンパイルエラーの理由を解説する。-->


# 参考資料(reference)

cpprefjp - C++日本語リファレンス

https://cpprefjp.github.io/

コンパイラの実装状況

https://cpprefjp.github.io/implementation-status.html


typedef は C++11 ではオワコン

https://qiita.com/Linda_pp/items/44a67c64c14cba00eef1

C99からC++14を駆け抜けるC++講座

https://qiita.com/yumetodo/items/e49a673afd9a3ecb81a8

## 自己参照(self reference)

コピペコンパイルエラーあるある

https://qiita.com/kaizen_nagoya/items/29c832de9d762aed2761

C++ Error Message Collection(1)does not name a type, 11 articles

https://qiita.com/kaizen_nagoya/items/acb9f1a9b5aad6df06bd

dockerにclang

https://qiita.com/kaizen_nagoya/items/8829ffeee397eda50e80

docker gnu(gcc/g++) and llvm(clang/clang++)

https://qiita.com/drafts/059874ea39c4de64c0f7

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

Compare the contents of C++N4910:2022, C++N4741:2018 and C++N4606:2015

https://qiita.com/kaizen_nagoya/items/483246d40f98abff7ded

C++ sample list

https://qiita.com/kaizen_nagoya/items/54ad75b73825b7c04f86


clang++, g++コンパイルエラー方針の違いの例

https://qiita.com/kaizen_nagoya/items/ea6e5009fe126d270a82

astyle 使ってみた

https://qiita.com/kaizen_nagoya/items/3c9a87a781d53a1a23f3

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 <misra_c.h>
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


 ＜この記事は個人の過去の経験に基づく個人の感想です。現在所属する組織、業務とは関係がありません。＞

# 文書履歴(document history)
ver. 0.01 初稿 　20220709