21.4.2 Header <ratio> synopsis ratio.syn] C++N4910:2022 (516) p660.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.

# 21.4.2 Header <ratio> synopsis ratio.syn] C++N4910:2022 (516) p660.cpp

## 算譜(source code)

```c++:p660.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 = "21.4.2 Header <ratio> synopsis ratio.syn] C++N4910:2022 (516) p660.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 <memory>
#include <typeinfo>

using namespace std;

#define see_below int
// Example 1
namespace std {
// 21.4.3, class template ratio
template<intmax_t N, intmax_t D = 1> class ratio;
}
// 21.4.4, ratio arithmetic
template<class R1, class R2> using ratio_add = see_below;
template<class R1, class R2> using ratio_subtract = see_below;
template<class R1, class R2> using ratio_multiply = see_below;
template<class R1, class R2> using ratio_divide = see_below;
// 21.4.5, ratio comparison
template<class R1, class R2> struct ratio_equal;
template<class R1, class R2> struct ratio_not_equal;
template<class R1, class R2> struct ratio_less;
template<class R1, class R2> struct ratio_less_equal;
template<class R1, class R2> struct ratio_greater;
template<class R1, class R2> struct ratio_greater_equal;
template<class R1, class R2>
inline constexpr bool ratio_equal_v = ratio_equal<R1, R2>::value;
template<class R1, class R2>
inline constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
template<class R1, class R2>
inline constexpr bool ratio_less_v = ratio_less<R1, R2>::value;
template<class R1, class R2>
inline constexpr bool ratio_less_equal_v = ratio_less_equal<R1, R2>::value;
template<class R1, class R2>
inline constexpr bool ratio_greater_v = ratio_greater<R1, R2>::value;
template<class R1, class R2>
inline constexpr bool ratio_greater_equal_v = ratio_greater_equal<R1, R2>::value;
// 21.4.6, convenience SI typedefs
using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
using atto  = ratio<1,      1'000'000'000'000'000'000>;
using femto = ratio<1,1'000'000'000'000'000>;
using pico  = ratio<1,1'000'000'000'000>;
using nano  = ratio<1, 1'000'000'000>;
using micro = ratio<1, 1'000'000>;
using milli = ratio<1,1'000>;
using centi = ratio<1,   100>;
using deci  = ratio<1,  10>;
using deca  = ratio< 10, 1>;
using hecto = ratio<  100, 1>;
using kilo  = ratio< 1'000, 1>;
using mega  = ratio<   1'000'000, 1>;
using giga  = ratio<  1'000'000'000, 1>;
using tera  = ratio<  1'000'000'000'000, 1>;
using peta  = ratio< 1'000'000'000'000'000, 1>;
using exa = ratio<  1'000'000'000'000'000'000, 1>;
using zetta = ratio<1'000'000'000'000'000'000'000, 1>;
using yotta = ratio<1'000'000'000'000'000'000'000'000, 1>;
// see below // see below
int main() {
    cout  <<  n4910 << endl;
    return EXIT_SUCCESS;
}
```

## 編纂・実行結果(compile and go)

```ubuntu:bash
$ clang++ p660.cpp -std=03 -o p660l -I. -Wall
In file included from p660.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 \
 ^
p660.cpp:30:10: error: unknown type name 'intmax_t'; did you mean '__intmax_t'?
template<intmax_t N, intmax_t D = 1> class ratio;
         ^~~~~~~~
         __intmax_t
/usr/include/x86_64-linux-gnu/bits/types.h:72:18: note: '__intmax_t' declared here
typedef long int __intmax_t;
                 ^
p660.cpp:30:22: error: unknown type name 'intmax_t'; did you mean '__intmax_t'?
template<intmax_t N, intmax_t D = 1> class ratio;
                     ^~~~~~~~
                     __intmax_t
/usr/include/x86_64-linux-gnu/bits/types.h:72:18: note: '__intmax_t' declared here
typedef long int __intmax_t;
                 ^
p660.cpp:33:48: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
template<class R1, class R2> using ratio_add = see_below;
                                               ^
p660.cpp:26:19: note: expanded from macro 'see_below'
#define see_below int
                  ^
p660.cpp:34:53: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
template<class R1, class R2> using ratio_subtract = see_below;
                                                    ^
p660.cpp:26:19: note: expanded from macro 'see_below'
#define see_below int
                  ^
p660.cpp:35:53: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
template<class R1, class R2> using ratio_multiply = see_below;
                                                    ^
p660.cpp:26:19: note: expanded from macro 'see_below'
#define see_below int
                  ^
p660.cpp:36:51: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
template<class R1, class R2> using ratio_divide = see_below;
                                                  ^
p660.cpp:26:19: note: expanded from macro 'see_below'
#define see_below int
                  ^
p660.cpp:45:10: error: unknown type name 'constexpr'
  inline constexpr bool ratio_equal_v = ratio_equal<R1, R2>::value;
         ^
p660.cpp:45:25: warning: variable templates are a C++14 extension [-Wc++14-extensions]
  inline constexpr bool ratio_equal_v = ratio_equal<R1, R2>::value;
                        ^
p660.cpp:45:3: warning: inline variables are a C++17 extension [-Wc++17-extensions]
  inline constexpr bool ratio_equal_v = ratio_equal<R1, R2>::value;
  ^
p660.cpp:47:10: error: unknown type name 'constexpr'
  inline constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
         ^
p660.cpp:47:25: warning: variable templates are a C++14 extension [-Wc++14-extensions]
  inline constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
                        ^
p660.cpp:47:3: warning: inline variables are a C++17 extension [-Wc++17-extensions]
  inline constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
  ^
p660.cpp:49:10: error: unknown type name 'constexpr'
  inline constexpr bool ratio_less_v = ratio_less<R1, R2>::value;
         ^
p660.cpp:49:25: warning: variable templates are a C++14 extension [-Wc++14-extensions]
  inline constexpr bool ratio_less_v = ratio_less<R1, R2>::value;
                        ^
p660.cpp:49:3: warning: inline variables are a C++17 extension [-Wc++17-extensions]
  inline constexpr bool ratio_less_v = ratio_less<R1, R2>::value;
  ^
p660.cpp:51:10: error: unknown type name 'constexpr'
  inline constexpr bool ratio_less_equal_v = ratio_less_equal<R1, R2>::value;
         ^
p660.cpp:51:25: warning: variable templates are a C++14 extension [-Wc++14-extensions]
  inline constexpr bool ratio_less_equal_v = ratio_less_equal<R1, R2>::value;
                        ^
p660.cpp:51:3: warning: inline variables are a C++17 extension [-Wc++17-extensions]
  inline constexpr bool ratio_less_equal_v = ratio_less_equal<R1, R2>::value;
  ^
p660.cpp:53:10: error: unknown type name 'constexpr'
  inline constexpr bool ratio_greater_v = ratio_greater<R1, R2>::value;
         ^
p660.cpp:53:25: warning: variable templates are a C++14 extension [-Wc++14-extensions]
  inline constexpr bool ratio_greater_v = ratio_greater<R1, R2>::value;
                        ^
p660.cpp:53:3: warning: inline variables are a C++17 extension [-Wc++17-extensions]
  inline constexpr bool ratio_greater_v = ratio_greater<R1, R2>::value;
  ^
p660.cpp:55:10: error: unknown type name 'constexpr'
  inline constexpr bool ratio_greater_equal_v = ratio_greater_equal<R1, R2>::value;
         ^
p660.cpp:55:25: warning: variable templates are a C++14 extension [-Wc++14-extensions]
  inline constexpr bool ratio_greater_equal_v = ratio_greater_equal<R1, R2>::value;
                        ^
p660.cpp:55:3: warning: inline variables are a C++17 extension [-Wc++17-extensions]
  inline constexpr bool ratio_greater_equal_v = ratio_greater_equal<R1, R2>::value;
  ^
p660.cpp:57:15: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
              ^
p660.cpp:57:28: error: expected '>'
using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
                           ^
p660.cpp:57:20: note: to match this '<'
using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
                   ^
p660.cpp:57:28: error: expected ';' after alias declaration
using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
                           ^
                           ;
p660.cpp:58:15: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
              ^
p660.cpp:58:28: error: expected '>'
using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
                           ^
p660.cpp:58:20: note: to match this '<'
using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
                   ^
p660.cpp:58:28: error: expected ';' after alias declaration
using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
                           ^
                           ;
p660.cpp:58:52: warning: missing terminating ' character [-Winvalid-pp-token]
using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
                                                   ^
p660.cpp:60:15: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
using femto = ratio<1,1'000'000'000'000'000>;
              ^
p660.cpp:60:24: error: expected '>'
using femto = ratio<1,1'000'000'000'000'000>;
                       ^
p660.cpp:60:20: note: to match this '<'
using femto = ratio<1,1'000'000'000'000'000>;
                   ^
p660.cpp:60:24: error: expected ';' after alias declaration
using femto = ratio<1,1'000'000'000'000'000>;
                       ^
                       ;
p660.cpp:60:40: warning: missing terminating ' character [-Winvalid-pp-token]
using femto = ratio<1,1'000'000'000'000'000>;
                                       ^
p660.cpp:62:15: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
using nano  = ratio<1, 1'000'000'000>;
              ^
p660.cpp:62:25: error: expected '>'
using nano  = ratio<1, 1'000'000'000>;
                        ^
p660.cpp:62:20: note: to match this '<'
using nano  = ratio<1, 1'000'000'000>;
                   ^
p660.cpp:62:25: error: expected ';' after alias declaration
using nano  = ratio<1, 1'000'000'000>;
                        ^
                        ;
p660.cpp:62:33: warning: missing terminating ' character [-Winvalid-pp-token]
using nano  = ratio<1, 1'000'000'000>;
                                ^
p660.cpp:64:15: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
using milli = ratio<1,1'000>;
              ^
p660.cpp:64:24: warning: missing terminating ' character [-Winvalid-pp-token]
using milli = ratio<1,1'000>;
                       ^
p660.cpp:64:24: error: expected '>'
p660.cpp:64:20: note: to match this '<'
using milli = ratio<1,1'000>;
                   ^
p660.cpp:64:24: error: expected ';' after alias declaration
using milli = ratio<1,1'000>;
                       ^
                       ;
p660.cpp:66:15: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
using deci  = ratio<1,  10>;
              ^
p660.cpp:67:15: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
using deca  = ratio< 10, 1>;
              ^
p660.cpp:68:15: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
using hecto = ratio<  100, 1>;
              ^
p660.cpp:69:15: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
using kilo  = ratio< 1'000, 1>;
              ^
p660.cpp:69:23: warning: missing terminating ' character [-Winvalid-pp-token]
using kilo  = ratio< 1'000, 1>;
                      ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
30 warnings and 20 errors generated.
$ clang++ p660.cpp -std=2b -o p660l -I. -Wall
p660.cpp:57:27: error: integer literal is too large to be represented in any integer type
using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
                          ^
p660.cpp:58:27: error: integer literal is too large to be represented in any integer type
using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
                          ^
p660.cpp:75:21: error: integer literal is too large to be represented in any integer type
using zetta = ratio<1'000'000'000'000'000'000'000, 1>;
                    ^
p660.cpp:76:21: error: integer literal is too large to be represented in any integer type
using yotta = ratio<1'000'000'000'000'000'000'000'000, 1>;
                    ^
4 errors generated.

$ g++ p660.cpp -std=03 -o p660g -I. -Wall
In file included from /usr/local/include/c++/12.1.0/atomic:38,
                 from p660.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 \
      |  ^~~~~
p660.cpp:45:10: warning: identifier 'constexpr' is a keyword in C++11 [-Wc++11-compat]
   45 |   inline constexpr bool ratio_equal_v = ratio_equal<R1, R2>::value;
      |          ^~~~~~~~~
p660.cpp:57:28: warning: multi-character character constant [-Wmultichar]
   57 | using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
      |                            ^~~~~
p660.cpp:57:36: warning: multi-character character constant [-Wmultichar]
   57 | using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
      |                                    ^~~~~
p660.cpp:57:44: warning: multi-character character constant [-Wmultichar]
   57 | using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
      |                                            ^~~~~
p660.cpp:57:52: warning: multi-character character constant [-Wmultichar]
   57 | using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
      |                                                    ^~~~~
p660.cpp:58:28: warning: multi-character character constant [-Wmultichar]
   58 | using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
      |                            ^~~~~
p660.cpp:58:36: warning: multi-character character constant [-Wmultichar]
   58 | using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
      |                                    ^~~~~
p660.cpp:58:44: warning: multi-character character constant [-Wmultichar]
   58 | using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
      |                                            ^~~~~
p660.cpp:58:52: warning: missing terminating ' character
   58 | using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
      |                                                    ^
p660.cpp:58:52: error: missing terminating ' character
   58 | using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
      |                                                    ^~~~~~
p660.cpp:59:30: warning: multi-character character constant [-Wmultichar]
   59 | using atto  = ratio<1,      1'000'000'000'000'000'000>;
      |                              ^~~~~
p660.cpp:59:38: warning: multi-character character constant [-Wmultichar]
   59 | using atto  = ratio<1,      1'000'000'000'000'000'000>;
      |                                      ^~~~~
p660.cpp:59:46: warning: multi-character character constant [-Wmultichar]
   59 | using atto  = ratio<1,      1'000'000'000'000'000'000>;
      |                                              ^~~~~
p660.cpp:60:24: warning: multi-character character constant [-Wmultichar]
   60 | using femto = ratio<1,1'000'000'000'000'000>;
      |                        ^~~~~
p660.cpp:60:32: warning: multi-character character constant [-Wmultichar]
   60 | using femto = ratio<1,1'000'000'000'000'000>;
      |                                ^~~~~
p660.cpp:60:40: warning: missing terminating ' character
   60 | using femto = ratio<1,1'000'000'000'000'000>;
      |                                        ^
p660.cpp:60:40: error: missing terminating ' character
   60 | using femto = ratio<1,1'000'000'000'000'000>;
      |                                        ^~~~~~
p660.cpp:61:24: warning: multi-character character constant [-Wmultichar]
   61 | using pico  = ratio<1,1'000'000'000'000>;
      |                        ^~~~~
p660.cpp:61:32: warning: multi-character character constant [-Wmultichar]
   61 | using pico  = ratio<1,1'000'000'000'000>;
      |                                ^~~~~
p660.cpp:62:25: warning: multi-character character constant [-Wmultichar]
   62 | using nano  = ratio<1, 1'000'000'000>;
      |                         ^~~~~
p660.cpp:62:33: warning: missing terminating ' character
   62 | using nano  = ratio<1, 1'000'000'000>;
      |                                 ^
p660.cpp:62:33: error: missing terminating ' character
   62 | using nano  = ratio<1, 1'000'000'000>;
      |                                 ^~~~~~
p660.cpp:63:25: warning: multi-character character constant [-Wmultichar]
   63 | using micro = ratio<1, 1'000'000>;
      |                         ^~~~~
p660.cpp:64:24: warning: missing terminating ' character
   64 | using milli = ratio<1,1'000>;
      |                        ^
p660.cpp:64:24: error: missing terminating ' character
   64 | using milli = ratio<1,1'000>;
      |                        ^~~~~~
p660.cpp:69:23: warning: missing terminating ' character
   69 | using kilo  = ratio< 1'000, 1>;
      |                       ^
p660.cpp:69:23: error: missing terminating ' character
   69 | using kilo  = ratio< 1'000, 1>;
      |                       ^~~~~~~~~
p660.cpp:70:25: warning: multi-character character constant [-Wmultichar]
   70 | using mega  = ratio<   1'000'000, 1>;
      |                         ^~~~~
p660.cpp:71:24: warning: multi-character character constant [-Wmultichar]
   71 | using giga  = ratio<  1'000'000'000, 1>;
      |                        ^~~~~
p660.cpp:71:32: warning: missing terminating ' character
   71 | using giga  = ratio<  1'000'000'000, 1>;
      |                                ^
p660.cpp:71:32: error: missing terminating ' character
   71 | using giga  = ratio<  1'000'000'000, 1>;
      |                                ^~~~~~~~~
p660.cpp:72:24: warning: multi-character character constant [-Wmultichar]
   72 | using tera  = ratio<  1'000'000'000'000, 1>;
      |                        ^~~~~
p660.cpp:72:32: warning: multi-character character constant [-Wmultichar]
   72 | using tera  = ratio<  1'000'000'000'000, 1>;
      |                                ^~~~~
p660.cpp:73:23: warning: multi-character character constant [-Wmultichar]
   73 | using peta  = ratio< 1'000'000'000'000'000, 1>;
      |                       ^~~~~
p660.cpp:73:31: warning: multi-character character constant [-Wmultichar]
   73 | using peta  = ratio< 1'000'000'000'000'000, 1>;
      |                               ^~~~~
p660.cpp:73:39: warning: missing terminating ' character
   73 | using peta  = ratio< 1'000'000'000'000'000, 1>;
      |                                       ^
p660.cpp:73:39: error: missing terminating ' character
   73 | using peta  = ratio< 1'000'000'000'000'000, 1>;
      |                                       ^~~~~~~~~
p660.cpp:74:22: warning: multi-character character constant [-Wmultichar]
   74 | using exa = ratio<  1'000'000'000'000'000'000, 1>;
      |                      ^~~~~
p660.cpp:74:30: warning: multi-character character constant [-Wmultichar]
   74 | using exa = ratio<  1'000'000'000'000'000'000, 1>;
      |                              ^~~~~
p660.cpp:74:38: warning: multi-character character constant [-Wmultichar]
   74 | using exa = ratio<  1'000'000'000'000'000'000, 1>;
      |                                      ^~~~~
p660.cpp:75:22: warning: multi-character character constant [-Wmultichar]
   75 | using zetta = ratio<1'000'000'000'000'000'000'000, 1>;
      |                      ^~~~~
p660.cpp:75:30: warning: multi-character character constant [-Wmultichar]
   75 | using zetta = ratio<1'000'000'000'000'000'000'000, 1>;
      |                              ^~~~~
p660.cpp:75:38: warning: multi-character character constant [-Wmultichar]
   75 | using zetta = ratio<1'000'000'000'000'000'000'000, 1>;
      |                                      ^~~~~
p660.cpp:75:46: warning: missing terminating ' character
   75 | using zetta = ratio<1'000'000'000'000'000'000'000, 1>;
      |                                              ^
p660.cpp:75:46: error: missing terminating ' character
   75 | using zetta = ratio<1'000'000'000'000'000'000'000, 1>;
      |                                              ^~~~~~~~~
p660.cpp:76:22: warning: multi-character character constant [-Wmultichar]
   76 | using yotta = ratio<1'000'000'000'000'000'000'000'000, 1>;
      |                      ^~~~~
p660.cpp:76:30: warning: multi-character character constant [-Wmultichar]
   76 | using yotta = ratio<1'000'000'000'000'000'000'000'000, 1>;
      |                              ^~~~~
p660.cpp:76:38: warning: multi-character character constant [-Wmultichar]
   76 | using yotta = ratio<1'000'000'000'000'000'000'000'000, 1>;
      |                                      ^~~~~
p660.cpp:76:46: warning: multi-character character constant [-Wmultichar]
   76 | using yotta = ratio<1'000'000'000'000'000'000'000'000, 1>;
      |                                              ^~~~~
p660.cpp:30:10: error: 'intmax_t' has not been declared
   30 | template<intmax_t N, intmax_t D = 1> class ratio;
      |          ^~~~~~~~
p660.cpp:30:22: error: 'intmax_t' has not been declared
   30 | template<intmax_t N, intmax_t D = 1> class ratio;
      |                      ^~~~~~~~
p660.cpp:33:30: error: expected unqualified-id before 'using'
   33 | template<class R1, class R2> using ratio_add = see_below;
      |                              ^~~~~
p660.cpp:34:30: error: expected unqualified-id before 'using'
   34 | template<class R1, class R2> using ratio_subtract = see_below;
      |                              ^~~~~
p660.cpp:35:30: error: expected unqualified-id before 'using'
   35 | template<class R1, class R2> using ratio_multiply = see_below;
      |                              ^~~~~
p660.cpp:36:30: error: expected unqualified-id before 'using'
   36 | template<class R1, class R2> using ratio_divide = see_below;
      |                              ^~~~~
p660.cpp:45:10: error: 'constexpr' does not name a type
   45 |   inline constexpr bool ratio_equal_v = ratio_equal<R1, R2>::value;
      |          ^~~~~~~~~
p660.cpp:45:10: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p660.cpp:47:10: error: 'constexpr' does not name a type
   47 |   inline constexpr bool ratio_not_equal_v = ratio_not_equal<R1, R2>::value;
      |          ^~~~~~~~~
p660.cpp:47:10: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p660.cpp:49:10: error: 'constexpr' does not name a type
   49 |   inline constexpr bool ratio_less_v = ratio_less<R1, R2>::value;
      |          ^~~~~~~~~
p660.cpp:49:10: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p660.cpp:51:10: error: 'constexpr' does not name a type
   51 |   inline constexpr bool ratio_less_equal_v = ratio_less_equal<R1, R2>::value;
      |          ^~~~~~~~~
p660.cpp:51:10: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p660.cpp:53:10: error: 'constexpr' does not name a type
   53 |   inline constexpr bool ratio_greater_v = ratio_greater<R1, R2>::value;
      |          ^~~~~~~~~
p660.cpp:53:10: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p660.cpp:55:10: error: 'constexpr' does not name a type
   55 |   inline constexpr bool ratio_greater_equal_v = ratio_greater_equal<R1, R2>::value;
      |          ^~~~~~~~~
p660.cpp:55:10: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p660.cpp:57:7: error: expected nested-name-specifier before 'yocto'
   57 | using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
      |       ^~~~~
p660.cpp:58:7: error: expected nested-name-specifier before 'zepto'
   58 | using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
      |       ^~~~~
p660.cpp:60:7: error: expected nested-name-specifier before 'femto'
   60 | using femto = ratio<1,1'000'000'000'000'000>;
      |       ^~~~~
p660.cpp:62:7: error: expected nested-name-specifier before 'nano'
   62 | using nano  = ratio<1, 1'000'000'000>;
      |       ^~~~
p660.cpp:64:7: error: expected nested-name-specifier before 'milli'
   64 | using milli = ratio<1,1'000>;
      |       ^~~~~
p660.cpp:66:7: error: expected nested-name-specifier before 'deci'
   66 | using deci  = ratio<1,  10>;
      |       ^~~~
p660.cpp:67:7: error: expected nested-name-specifier before 'deca'
   67 | using deca  = ratio< 10, 1>;
      |       ^~~~
p660.cpp:68:7: error: expected nested-name-specifier before 'hecto'
   68 | using hecto = ratio<  100, 1>;
      |       ^~~~~
p660.cpp:69:7: error: expected nested-name-specifier before 'kilo'
   69 | using kilo  = ratio< 1'000, 1>;
      |       ^~~~
p660.cpp:71:7: error: expected nested-name-specifier before 'giga'
   71 | using giga  = ratio<  1'000'000'000, 1>;
      |       ^~~~
p660.cpp:73:7: error: expected nested-name-specifier before 'peta'
   73 | using peta  = ratio< 1'000'000'000'000'000, 1>;
      |       ^~~~
p660.cpp:75:7: error: expected nested-name-specifier before 'zetta'
   75 | using zetta = ratio<1'000'000'000'000'000'000'000, 1>;
      |       ^~~~~

$ g++ p660.cpp -std=2b -o p660g -I. -Wall
p660.cpp:57:27: warning: integer constant is too large for its type
   57 | using yocto = ratio<1,    1'000'000'000'000'000'000'000'000>;
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
p660.cpp:58:27: warning: integer constant is too large for its type
   58 | using zepto = ratio<1,    1'000'000'000'000'000'000'000>;
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
p660.cpp:75:21: warning: integer constant is too large for its type
   75 | using zetta = ratio<1'000'000'000'000'000'000'000, 1>;
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
p660.cpp:76:21: warning: integer constant is too large for its type
   76 | using yotta = ratio<1'000'000'000'000'000'000'000'000, 1>;
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21.4.2 Header <ratio> synopsis ratio.syn] C++N4910:2022 (516) p660.cpp
```

## 検討事項(agenda)
意味のある出力。

<!-- 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


@kazuo_reve 私が効果を確認した「小川メソッド」

https://qiita.com/kazuo_reve/items/a3ea1d9171deeccc04da

## 自己参照(self reference)

ocker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

C++N4910:2022 tag follower 200人超えました。ありがとうございます。

https://qiita.com/kaizen_nagoya/items/a63fb96d351ac5c16ff7

C++N4910:2022 tag follower 200人超えました。ありがとうございます。

https://qiita.com/kaizen_nagoya/items/a63fb96d351ac5c16ff7

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

DoCAP（ドゥーキャップ）って何ですか？

https://qiita.com/kaizen_nagoya/items/47e0e6509ab792c43327

小川メソッド　覚え（書きかけ）

https://qiita.com/kaizen_nagoya/items/3593d72eca551742df68


 ＜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 　20220723