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17.3.5.3 numeric_limits specializations [numeric.special] C++N4910:2022 (276) p507.cpp

Posted at

はじめに(Introduction)

N4910 Working Draft, Standard for Programming Language C++

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

C++N4741, 2018 Standard Working Draft on ISO/IEC 14882 sample code compile list

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++

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.

17.3.5.3 numeric_limits specializations [numeric.special] C++N4910:2022 (276) p507.cpp

算譜(source code)

p507.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 = "17.3.5.3 numeric_limits specializations [numeric.special] C++N4910:2022 (276) p507.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>

using namespace std;

// Example 1
namespace std {
template<> class numeric_limits<float> {
public:
    static constexpr bool is_specialized = true;
    static constexpr float min() noexcept {
        return 1.17549435E-38F;
    }
    static constexpr float max() noexcept {
        return 3.40282347E+38F;
    }
    static constexpr float lowest() noexcept {
        return -3.40282347E+38F;
    }
    static constexpr int digits   = 24;
    static constexpr int digits10 =  6;
    static constexpr int max_digits10 =  9;
    static constexpr bool is_signed  = true;
    static constexpr bool is_integer = false;
    static constexpr bool is_exact   = false;
    static constexpr int radix = 2;
    static constexpr float epsilon() noexcept {
        return 1.19209290E-07F;
    }
    static constexpr float round_error() noexcept {
        return 0.5F;
    }
    static constexpr int min_exponent   = -125;
    static constexpr int min_exponent10 = - 37;
    static constexpr int max_exponent   = +128;
    static constexpr int max_exponent10 = + 38;
    static constexpr bool has_infinity = true;
    static constexpr bool has_quiet_NaN = true;
    static constexpr bool has_signaling_NaN = true;
    static constexpr float_denorm_style has_denorm = denorm_absent;
    static constexpr bool has_denorm_loss = false;
    static constexpr float infinity() noexcept {
        return value ;
    }
    static constexpr float quiet_NaN() noexcept {
        return value ;
    }
    static constexpr float signaling_NaN() noexcept {
        return value;
    }
    static constexpr float denorm_min() noexcept {
        return min();
    }
    static constexpr bool is_iec559  = true;
    static constexpr bool is_bounded = true;
    static constexpr bool is_modulo  = false;
    static constexpr bool traps      = true;
    static constexpr bool tinyness_before = true;
    static constexpr float_round_style round_style = round_to_nearest;
};
}
// The specialization for bool shall be provided as follows:
namespace std {
template<> class numeric_limits<bool> {
public:
    static constexpr bool is_specialized = true;
    static constexpr bool min() noexcept {
        return false;
    }
    static constexpr bool max() noexcept {
        return true;
    }
    static constexpr bool lowest() noexcept {
        return false;
    }
    static constexpr int  digits = 1;
    static constexpr int  digits10 = 0;
    static constexpr int  max_digits10 = 0;
    static constexpr bool is_signed = false;
    static constexpr bool is_integer = true;
    static constexpr bool is_exact = true;
    static constexpr int  radix = 2;
    static constexpr bool epsilon() noexcept {
        return 0;
    }
    static constexpr bool round_error() noexcept {
        return 0;
    }
    static constexpr int  min_exponent = 0;
    static constexpr int  min_exponent10 = 0;
    static constexpr int  max_exponent = 0;
    static constexpr int  max_exponent10 = 0;
    static constexpr bool has_infinity = false;
    static constexpr bool has_quiet_NaN = false;
    static constexpr bool has_signaling_NaN = false;
    static constexpr float_denorm_style has_denorm = denorm_absent;
    static constexpr bool has_denorm_loss = false;
    static constexpr bool infinity() noexcept {
        return 0;
    }
    static constexpr bool quiet_NaN() noexcept {
        return 0;
    }
    static constexpr bool signaling_NaN() noexcept {
        return 0;
    }
    static constexpr bool denorm_min() noexcept {
        return 0;
    }
    static constexpr bool is_iec559 = false;
    static constexpr bool is_bounded = true;
    static constexpr bool is_modulo = false;
    static constexpr bool traps = false;
    static constexpr bool tinyness_before = false;
    static constexpr float_round_style round_style = round_toward_zero;
};
}
int main() {
    cout  <<  n4910 << endl;
    return EXIT_SUCCESS;
}

Script

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)

bash
# ./clgc.sh p507
$ clang++ p507.cpp -std=c++03 -o p507l -I. -Wall
In file included from p507.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 \
 ^
p507.cpp:27:25: error: explicit specialization of undeclared template class 'numeric_limits'
       template<> class numeric_limits<float> {
                        ^             ~~~~~~~
p507.cpp:29:17: error: unknown type name 'constexpr'
         static constexpr bool is_specialized = true;
                ^
p507.cpp:30:17: error: unknown type name 'constexpr'
         static constexpr float min() noexcept { return 1.17549435E-38F; }
                ^
p507.cpp:30:38: error: expected ';' at end of declaration list
         static constexpr float min() noexcept { return 1.17549435E-38F; }
                                     ^
                                     ;
p507.cpp:34:14: error: unknown type name 'constexpr'
      static constexpr int digits10 =  6;
             ^
p507.cpp:35:14: error: unknown type name 'constexpr'
      static constexpr int max_digits10 =  9;
             ^
p507.cpp:36:14: error: unknown type name 'constexpr'
      static constexpr bool is_signed  = true;
             ^
p507.cpp:37:14: error: unknown type name 'constexpr'
      static constexpr bool is_integer = false;
             ^
p507.cpp:38:14: error: unknown type name 'constexpr'
      static constexpr bool is_exact   = false;
             ^
p507.cpp:39:14: error: unknown type name 'constexpr'
      static constexpr int radix = 2;
             ^
p507.cpp:40:14: error: unknown type name 'constexpr'
      static constexpr float epsilon() noexcept { return 1.19209290E-07F; }
             ^
p507.cpp:40:39: error: expected ';' at end of declaration list
      static constexpr float epsilon() noexcept { return 1.19209290E-07F; }
                                      ^
                                      ;
p507.cpp:43:8: error: unknown type name 'constexpr'
static constexpr int min_exponent10 = - 37;
       ^
p507.cpp:44:8: error: unknown type name 'constexpr'
static constexpr int max_exponent   = +128;
       ^
p507.cpp:45:8: error: unknown type name 'constexpr'
static constexpr int max_exponent10 = + 38;
       ^
p507.cpp:46:8: error: unknown type name 'constexpr'
static constexpr bool has_infinity = true;
       ^
p507.cpp:47:8: error: unknown type name 'constexpr'
static constexpr bool has_quiet_NaN = true;
       ^
p507.cpp:48:8: error: unknown type name 'constexpr'
static constexpr bool has_signaling_NaN = true;
       ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
rm: cannot remove 'p507l': No such file or directory
$ clang++ p507.cpp -std=c++2b -o p507l -I. -Wall
p507.cpp:27:25: error: redefinition of 'numeric_limits<float>'
       template<> class numeric_limits<float> {
                        ^~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/limits:1664:12: note: previous definition is here
    struct numeric_limits<float>
           ^
p507.cpp:65:26: error: redefinition of 'numeric_limits<bool>'
        template<> class numeric_limits<bool> {
                         ^~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/limits:384:12: note: previous definition is here
    struct numeric_limits<bool>
           ^
2 errors generated.

$ g++ p507.cpp -std=c++03 -o p507g -I. -Wall
In file included from /usr/local/include/c++/12.1.0/atomic:38,
                 from p507.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 \
      |  ^~~~~
p507.cpp:29:17: warning: identifier 'constexpr' is a keyword in C++11 [-Wc++11-compat]
   29 |          static constexpr bool is_specialized = true;
      |                 ^~~~~~~~~
p507.cpp:30:39: warning: identifier 'noexcept' is a keyword in C++11 [-Wc++11-compat]
   30 |          static constexpr float min() noexcept { return 1.17549435E-38F; }
      |                                       ^~~~~~~~
p507.cpp:27:25: error: 'numeric_limits' is not a class template
   27 |        template<> class numeric_limits<float> {
      |                         ^~~~~~~~~~~~~~
p507.cpp:27:47: error: explicit specialization of non-template 'std::numeric_limits'
   27 |        template<> class numeric_limits<float> {
      |                                               ^
p507.cpp:29:17: error: 'constexpr' does not name a type
   29 |          static constexpr bool is_specialized = true;
      |                 ^~~~~~~~~
p507.cpp:29:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:30:17: error: 'constexpr' does not name a type
   30 |          static constexpr float min() noexcept { return 1.17549435E-38F; }
      |                 ^~~~~~~~~
p507.cpp:30:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:31:17: error: 'constexpr' does not name a type
   31 |          static constexpr float max() noexcept { return 3.40282347E+38F; }
      |                 ^~~~~~~~~
p507.cpp:31:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:32:17: error: 'constexpr' does not name a type
   32 |          static constexpr float lowest() noexcept { return -3.40282347E+38F; }
      |                 ^~~~~~~~~
p507.cpp:32:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:33:14: error: 'constexpr' does not name a type
   33 |       static constexpr int digits   = 24;
      |              ^~~~~~~~~
p507.cpp:33:14: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:34:14: error: 'constexpr' does not name a type
   34 |       static constexpr int digits10 =  6;
      |              ^~~~~~~~~
p507.cpp:34:14: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:35:14: error: 'constexpr' does not name a type
   35 |       static constexpr int max_digits10 =  9;
      |              ^~~~~~~~~
p507.cpp:35:14: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:36:14: error: 'constexpr' does not name a type
   36 |       static constexpr bool is_signed  = true;
      |              ^~~~~~~~~
p507.cpp:36:14: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:37:14: error: 'constexpr' does not name a type
   37 |       static constexpr bool is_integer = false;
      |              ^~~~~~~~~
p507.cpp:37:14: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:38:14: error: 'constexpr' does not name a type
   38 |       static constexpr bool is_exact   = false;
      |              ^~~~~~~~~
p507.cpp:38:14: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:39:14: error: 'constexpr' does not name a type
   39 |       static constexpr int radix = 2;
      |              ^~~~~~~~~
p507.cpp:39:14: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:40:14: error: 'constexpr' does not name a type
   40 |       static constexpr float epsilon() noexcept { return 1.19209290E-07F; }
      |              ^~~~~~~~~
p507.cpp:40:14: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:41:8: error: 'constexpr' does not name a type
   41 | static constexpr float round_error() noexcept { return 0.5F; }
      |        ^~~~~~~~~
p507.cpp:41:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:42:8: error: 'constexpr' does not name a type
   42 | static constexpr int min_exponent   = -125;
      |        ^~~~~~~~~
p507.cpp:42:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:43:8: error: 'constexpr' does not name a type
   43 | static constexpr int min_exponent10 = - 37;
      |        ^~~~~~~~~
p507.cpp:43:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:44:8: error: 'constexpr' does not name a type
   44 | static constexpr int max_exponent   = +128;
      |        ^~~~~~~~~
p507.cpp:44:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:45:8: error: 'constexpr' does not name a type
   45 | static constexpr int max_exponent10 = + 38;
      |        ^~~~~~~~~
p507.cpp:45:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:46:8: error: 'constexpr' does not name a type
   46 | static constexpr bool has_infinity = true;
      |        ^~~~~~~~~
p507.cpp:46:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:47:8: error: 'constexpr' does not name a type
   47 | static constexpr bool has_quiet_NaN = true;
      |        ^~~~~~~~~
p507.cpp:47:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:48:8: error: 'constexpr' does not name a type
   48 | static constexpr bool has_signaling_NaN = true;
      |        ^~~~~~~~~
p507.cpp:48:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:49:8: error: 'constexpr' does not name a type
   49 | static constexpr float_denorm_style has_denorm = denorm_absent;
      |        ^~~~~~~~~
p507.cpp:49:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:50:8: error: 'constexpr' does not name a type
   50 | static constexpr bool has_denorm_loss = false;
      |        ^~~~~~~~~
p507.cpp:50:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:51:8: error: 'constexpr' does not name a type
   51 | static constexpr float infinity() noexcept { return value ; }
      |        ^~~~~~~~~
p507.cpp:51:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:52:8: error: 'constexpr' does not name a type
   52 | static constexpr float quiet_NaN() noexcept { return value ; }
      |        ^~~~~~~~~
p507.cpp:52:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:53:8: error: 'constexpr' does not name a type
   53 | static constexpr float signaling_NaN() noexcept { return value; }
      |        ^~~~~~~~~
p507.cpp:53:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:54:8: error: 'constexpr' does not name a type
   54 | static constexpr float denorm_min() noexcept { return min(); }
      |        ^~~~~~~~~
p507.cpp:54:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:55:17: error: 'constexpr' does not name a type
   55 |          static constexpr bool is_iec559  = true;
      |                 ^~~~~~~~~
p507.cpp:55:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:56:17: error: 'constexpr' does not name a type
   56 |          static constexpr bool is_bounded = true;
      |                 ^~~~~~~~~
p507.cpp:56:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:57:17: error: 'constexpr' does not name a type
   57 |          static constexpr bool is_modulo  = false;
      |                 ^~~~~~~~~
p507.cpp:57:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:58:17: error: 'constexpr' does not name a type
   58 |          static constexpr bool traps      = true;
      |                 ^~~~~~~~~
p507.cpp:58:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:59:17: error: 'constexpr' does not name a type
   59 |          static constexpr bool tinyness_before = true;
      |                 ^~~~~~~~~
p507.cpp:59:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:60:17: error: 'constexpr' does not name a type
   60 |          static constexpr float_round_style round_style = round_to_nearest;
      |                 ^~~~~~~~~
p507.cpp:60:17: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p507.cpp:65:26: error: 'numeric_limits' is not a class template
   65 |         template<> class numeric_limits<bool> {
      |                          ^~~~~~~~~~~~~~
p507.cpp:65:45: error: 'std::numeric_limits' is not a template
   65 |         template<> class numeric_limits<bool> {
      |                                             ^
p507.cpp:27:25: note: previous declaration here
   27 |        template<> class numeric_limits<float> {
      |                         ^~~~~~~~~~~~~~
rm: cannot remove 'p507g': No such file or directory

$ g++ p507.cpp -std=c++2b -o p507g -I. -Wall
p507.cpp:27:25: error: redefinition of 'class std::numeric_limits<float>'
   27 |        template<> class numeric_limits<float> {
      |                         ^~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/bits/specfun.h:46,
                 from /usr/local/include/c++/12.1.0/cmath:1935,
                 from /usr/local/include/c++/12.1.0/complex:44,
                 from p507.cpp:17:
/usr/local/include/c++/12.1.0/limits:1670:12: note: previous definition of 'class std::numeric_limits<float>'
 1670 |     struct numeric_limits<float>
      |            ^~~~~~~~~~~~~~~~~~~~~
p507.cpp:65:26: error: redefinition of 'class std::numeric_limits<bool>'
   65 |         template<> class numeric_limits<bool> {
      |                          ^~~~~~~~~~~~~~~~~~~~
/usr/local/include/c++/12.1.0/limits:384:12: note: previous definition of 'class std::numeric_limits<bool>'
  384 |     struct numeric_limits<bool>
      |            ^~~~~~~~~~~~~~~~~~~~

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。

参考資料(reference)

cpprefjp - C++日本語リファレンス

コンパイラの実装状況

typedef は C++11 ではオワコン

C99からC++14を駆け抜けるC++講座

自己参照(self reference)

コピペコンパイルエラーあるある

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

dockerにclang

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

コンパイル用shell script C版(clangとgcc)とC++版(clang++とg++)

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

C++ sample list

clang++, g++コンパイルエラー方針の違いの例

astyle 使ってみた

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

<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。>

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