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.
17.11.2.3 Class weak_ordering [cmp.weakord] C++N4910:2022 (317) p530.cpp
算譜(source code)
p530.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 = "17.11.2.3 Class weak_ordering [cmp.weakord] C++N4910:2022 (317) p530.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 {
class weak_ordering {
int value; // exposition only // exposition-only constructors
constexpr explicit weak_ordering(ord v) noexcept : value(int(v)) {} // exposition only
public:
// valid values
static const weak_ordering less;
static const weak_ordering equivalent;
static const weak_ordering greater;
// conversions
constexpr operator partial_ordering() const noexcept;
// comparisons
}
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
friend constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v)
// valid values’ definitions
};
inline constexpr weak_ordering weak_ordering::less(ord::less);
inline constexpr weak_ordering weak_ordering::equivalent(ord::equivalent);
inline constexpr weak_ordering weak_ordering::greater(ord::greater);
constexpr operator partial_ordering() const noexcept;
// Returns:
value == 0 ? partial_ordering::equivalent :
value < 0 ? partial_ordering::less :
partial_ordering::greater
constexpr bool operator==(weak_ordering v, unspecified) noexcept;
constexpr bool operator< (weak_ordering v, unspecified) noexcept;
constexpr bool operator> (weak_ordering v, unspecified) noexcept;
constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
// Returns: v.value @ 0 for operator@.
constexpr bool operator< (unspecified, weak_ordering v) noexcept;
constexpr bool operator> (unspecified, weak_ordering v) noexcept;
constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
// Returns: 0 @ v.value for operator@.
constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
// Returns: v.
constexpr weak_ordering operator<=>(unspecified, weak_ordering v) noexcept;
// Returns: v < 0 ? weak_ordering::greater : v > 0 ? weak_ordering::less : v.
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 p530
$ clang++ p530.cpp -std=c++03 -o p530l -I. -Wall
In file included from p530.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 \
^
p530.cpp:29:1: error: unknown type name 'constexpr'
constexpr explicit weak_ordering(ord v) noexcept : value(int(v)) {} // exposition only
^
p530.cpp:29:34: error: unknown type name 'ord'
constexpr explicit weak_ordering(ord v) noexcept : value(int(v)) {} // exposition only
^
p530.cpp:29:20: error: constructor cannot have a return type
constexpr explicit weak_ordering(ord v) noexcept : value(int(v)) {} // exposition only
^~~~~~~~~~~~~
p530.cpp:29:40: error: expected ';' at end of declaration list
constexpr explicit weak_ordering(ord v) noexcept : value(int(v)) {} // exposition only
^
;
p530.cpp:36:7: error: unknown type name 'constexpr'
constexpr operator partial_ordering() const noexcept;
^
p530.cpp:36:26: error: unknown type name 'partial_ordering'
constexpr operator partial_ordering() const noexcept;
^
p530.cpp:39:1: error: 'friend' used outside of class
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
^
p530.cpp:39:17: error: expected ';' after top level declarator
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
^
;
p530.cpp:39:51: error: unknown type name 'unspecified'
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
^
p530.cpp:39:64: error: expected function body after function declarator
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
^
p530.cpp:40:1: error: 'friend' used outside of class
friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
^
p530.cpp:40:8: error: unknown type name 'constexpr'
friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
^
p530.cpp:40:68: error: expected function body after function declarator
friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
^
p530.cpp:41:1: error: 'friend' used outside of class
friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
^
p530.cpp:41:8: error: unknown type name 'constexpr'
friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
^
p530.cpp:41:51: error: unknown type name 'unspecified'
friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
^
p530.cpp:41:64: error: expected function body after function declarator
friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
^
p530.cpp:42:1: error: 'friend' used outside of class
friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
rm: cannot remove 'p530l': No such file or directory
$ clang++ p530.cpp -std=c++2b -o p530l -I. -Wall
p530.cpp:27:11: error: redefinition of 'weak_ordering'
class weak_ordering {
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/compare:155:9: note: previous definition is here
class weak_ordering
^
p530.cpp:39:1: error: 'friend' used outside of class
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
^
p530.cpp:39:18: error: cannot combine with previous 'class' declaration specifier
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
^
p530.cpp:39:51: error: unknown type name 'unspecified'
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
^
p530.cpp:40:1: error: 'friend' used outside of class
friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
^
p530.cpp:40:23: error: redefinition of 'operator=='
friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/compare:180:5: note: previous definition is here
operator==(weak_ordering, weak_ordering) noexcept = default;
^
p530.cpp:41:1: error: 'friend' used outside of class
friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
^
p530.cpp:41:51: error: unknown type name 'unspecified'
friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
^
p530.cpp:42:1: error: 'friend' used outside of class
friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
^
p530.cpp:42:51: error: unknown type name 'unspecified'
friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
^
p530.cpp:43:1: error: 'friend' used outside of class
friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
^
p530.cpp:43:51: error: unknown type name 'unspecified'
friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
^
p530.cpp:44:1: error: 'friend' used outside of class
friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
^
p530.cpp:44:51: error: unknown type name 'unspecified'
friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
^
p530.cpp:45:1: error: 'friend' used outside of class
friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
^
p530.cpp:45:34: error: unknown type name 'unspecified'
friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
^
p530.cpp:46:1: error: 'friend' used outside of class
friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
^
p530.cpp:46:34: error: unknown type name 'unspecified'
friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
^
p530.cpp:47:1: error: 'friend' used outside of class
friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
$ g++ p530.cpp -std=c++03 -o p530g -I. -Wall
In file included from /usr/local/include/c++/12.1.0/atomic:38,
from p530.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 \
| ^~~~~
p530.cpp:29:1: warning: identifier 'constexpr' is a keyword in C++11 [-Wc++11-compat]
29 | constexpr explicit weak_ordering(ord v) noexcept : value(int(v)) {} // exposition only
| ^~~~~~~~~
p530.cpp:29:41: warning: identifier 'noexcept' is a keyword in C++11 [-Wc++11-compat]
29 | constexpr explicit weak_ordering(ord v) noexcept : value(int(v)) {} // exposition only
| ^~~~~~~~
p530.cpp:29:1: error: 'constexpr' does not name a type
29 | constexpr explicit weak_ordering(ord v) noexcept : value(int(v)) {} // exposition only
| ^~~~~~~~~
p530.cpp:29:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:36:7: error: 'constexpr' does not name a type
36 | constexpr operator partial_ordering() const noexcept;
| ^~~~~~~~~
p530.cpp:36:7: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:39:1: error: 'friend' used outside of class
39 | friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:39:18: error: expected initializer before 'bool'
39 | friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
| ^~~~
p530.cpp:40:1: error: 'friend' used outside of class
40 | friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
| ^~~~~~
| ------
p530.cpp:40:8: error: 'constexpr' does not name a type
40 | friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
| ^~~~~~~~~
p530.cpp:40:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:41:1: error: 'friend' used outside of class
41 | friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:41:8: error: 'constexpr' does not name a type
41 | friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:41:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:42:1: error: 'friend' used outside of class
42 | friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:42:8: error: 'constexpr' does not name a type
42 | friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:42:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:43:1: error: 'friend' used outside of class
43 | friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:43:8: error: 'constexpr' does not name a type
43 | friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:43:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:44:1: error: 'friend' used outside of class
44 | friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:44:8: error: 'constexpr' does not name a type
44 | friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:44:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:45:1: error: 'friend' used outside of class
45 | friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^~~~~~
| ------
p530.cpp:45:8: error: 'constexpr' does not name a type
45 | friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~
p530.cpp:45:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:46:1: error: 'friend' used outside of class
46 | friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^~~~~~
| ------
p530.cpp:46:8: error: 'constexpr' does not name a type
46 | friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~
p530.cpp:46:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:47:1: error: 'friend' used outside of class
47 | friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^~~~~~
| ------
p530.cpp:47:8: error: 'constexpr' does not name a type
47 | friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~
p530.cpp:47:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:48:1: error: 'friend' used outside of class
48 | friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^~~~~~
| ------
p530.cpp:48:8: error: 'constexpr' does not name a type
48 | friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~
p530.cpp:48:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:49:1: error: 'friend' used outside of class
49 | friend constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:49:8: error: 'constexpr' does not name a type
49 | friend constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:49:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:50:1: error: 'friend' used outside of class
50 | friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v)
| ^~~~~~
| ------
p530.cpp:50:8: error: 'constexpr' does not name a type
50 | friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v)
| ^~~~~~~~~
p530.cpp:50:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:53:8: error: 'constexpr' does not name a type
53 | inline constexpr weak_ordering weak_ordering::less(ord::less);
| ^~~~~~~~~
p530.cpp:53:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:54:8: error: 'constexpr' does not name a type
54 | inline constexpr weak_ordering weak_ordering::equivalent(ord::equivalent);
| ^~~~~~~~~
p530.cpp:54:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:55:8: error: 'constexpr' does not name a type
55 | inline constexpr weak_ordering weak_ordering::greater(ord::greater);
| ^~~~~~~~~
p530.cpp:55:8: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:56:1: error: 'constexpr' does not name a type
56 | constexpr operator partial_ordering() const noexcept;
| ^~~~~~~~~
p530.cpp:56:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:58:8: error: 'value' does not name a type
58 | value == 0 ? partial_ordering::equivalent :
| ^~~~~
p530.cpp:62:1: error: 'constexpr' does not name a type
62 | constexpr bool operator< (weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:62:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:63:1: error: 'constexpr' does not name a type
63 | constexpr bool operator> (weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:63:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:64:1: error: 'constexpr' does not name a type
64 | constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:64:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:65:1: error: 'constexpr' does not name a type
65 | constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:65:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:67:1: error: 'constexpr' does not name a type
67 | constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~
p530.cpp:67:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:68:1: error: 'constexpr' does not name a type
68 | constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~
p530.cpp:68:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:69:1: error: 'constexpr' does not name a type
69 | constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~
p530.cpp:69:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:70:1: error: 'constexpr' does not name a type
70 | constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~
p530.cpp:70:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:72:1: error: 'constexpr' does not name a type
72 | constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~
p530.cpp:72:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
p530.cpp:74:1: error: 'constexpr' does not name a type
74 | constexpr weak_ordering operator<=>(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~
p530.cpp:74:1: note: C++11 'constexpr' only available with '-std=c++11' or '-std=gnu++11'
rm: cannot remove 'p530g': No such file or directory
$ g++ p530.cpp -std=c++2b -o p530g -I. -Wall
p530.cpp:27:11: error: redefinition of 'class std::weak_ordering'
27 | class weak_ordering {
| ^~~~~~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/bits/char_traits.h:45,
from /usr/local/include/c++/12.1.0/ios:40,
from /usr/local/include/c++/12.1.0/ostream:38,
from /usr/local/include/c++/12.1.0/iostream:39,
from p530.cpp:10:
/usr/local/include/c++/12.1.0/compare:167:9: note: previous definition of 'class std::weak_ordering'
167 | class weak_ordering
| ^~~~~~~~~~~~~
p530.cpp:39:1: error: 'friend' used outside of class
39 | friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:39:51: error: 'unspecified' has not been declared
39 | friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:27:5: error: new types may not be defined in a return type
27 | class weak_ordering {
| ^~~~~
p530.cpp:27:5: note: (perhaps a semicolon is missing after the definition of '<type error>')
p530.cpp:27:5: error: two or more data types in declaration of 'operator=='
p530.cpp:40:1: error: 'friend' used outside of class
40 | friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
| ^~~~~~
| ------
p530.cpp:41:1: error: 'friend' used outside of class
41 | friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:41:51: error: 'unspecified' has not been declared
41 | friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:42:1: error: 'friend' used outside of class
42 | friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:42:51: error: 'unspecified' has not been declared
42 | friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:43:1: error: 'friend' used outside of class
43 | friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:43:51: error: 'unspecified' has not been declared
43 | friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:44:1: error: 'friend' used outside of class
44 | friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:44:51: error: 'unspecified' has not been declared
44 | friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:45:1: error: 'friend' used outside of class
45 | friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^~~~~~
| ------
p530.cpp:45:23: error: declaration of 'operator<' as non-function
45 | friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~
p530.cpp:45:34: error: 'unspecified' was not declared in this scope
45 | friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~~~
p530.cpp:45:61: error: expected primary-expression before 'v'
45 | friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^
p530.cpp:46:1: error: 'friend' used outside of class
46 | friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^~~~~~
| ------
p530.cpp:46:23: error: declaration of 'operator>' as non-function
46 | friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~
p530.cpp:46:34: error: 'unspecified' was not declared in this scope
46 | friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~~~
p530.cpp:46:61: error: expected primary-expression before 'v'
46 | friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^
p530.cpp:47:1: error: 'friend' used outside of class
47 | friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^~~~~~
| ------
p530.cpp:47:23: error: declaration of 'operator<=' as non-function
47 | friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~
p530.cpp:47:34: error: 'unspecified' was not declared in this scope
47 | friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~~~
p530.cpp:47:61: error: expected primary-expression before 'v'
47 | friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^
p530.cpp:48:1: error: 'friend' used outside of class
48 | friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^~~~~~
| ------
p530.cpp:48:23: error: declaration of 'operator>=' as non-function
48 | friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~
p530.cpp:48:34: error: 'unspecified' was not declared in this scope
48 | friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~~~
p530.cpp:48:61: error: expected primary-expression before 'v'
48 | friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^
p530.cpp:49:1: error: 'friend' used outside of class
49 | friend constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
| ^~~~~~
| ------
p530.cpp:49:61: error: 'unspecified' has not been declared
49 | friend constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:50:1: error: 'friend' used outside of class
50 | friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v)
| ^~~~~~
| ------
p530.cpp:50:32: error: declaration of 'operator<=>' as non-function
50 | friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v)
| ^~~~~~~~
p530.cpp:50:44: error: 'unspecified' was not declared in this scope
50 | friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v)
| ^~~~~~~~~~~
p530.cpp:50:71: error: expected primary-expression before 'v'
50 | friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v)
| ^
p530.cpp:53:52: error: 'ord' has not been declared
53 | inline constexpr weak_ordering weak_ordering::less(ord::less);
| ^~~
p530.cpp:54:58: error: 'ord' has not been declared
54 | inline constexpr weak_ordering weak_ordering::equivalent(ord::equivalent);
| ^~~
p530.cpp:55:55: error: 'ord' has not been declared
55 | inline constexpr weak_ordering weak_ordering::greater(ord::greater);
| ^~~
p530.cpp:56:45: error: non-member function 'constexpr operator std::partial_ordering()' cannot have cv-qualifier
56 | constexpr operator partial_ordering() const noexcept;
| ^~~~~~~~
p530.cpp:56:11: error: 'constexpr operator std::partial_ordering()' must be a non-static member function
56 | constexpr operator partial_ordering() const noexcept;
| ^~~~~~~~
p530.cpp:58:8: error: 'value' does not name a type
58 | value == 0 ? partial_ordering::equivalent :
| ^~~~~
p530.cpp:62:44: error: 'unspecified' has not been declared
62 | constexpr bool operator< (weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:63:44: error: 'unspecified' has not been declared
63 | constexpr bool operator> (weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:64:44: error: 'unspecified' has not been declared
64 | constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:65:44: error: 'unspecified' has not been declared
65 | constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:67:16: error: declaration of 'operator<' as non-function
67 | constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~
p530.cpp:67:27: error: 'unspecified' was not declared in this scope
67 | constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~~~
p530.cpp:67:54: error: expected primary-expression before 'v'
67 | constexpr bool operator< (unspecified, weak_ordering v) noexcept;
| ^
p530.cpp:68:16: error: declaration of 'operator>' as non-function
68 | constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~
p530.cpp:68:27: error: 'unspecified' was not declared in this scope
68 | constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~~~
p530.cpp:68:54: error: expected primary-expression before 'v'
68 | constexpr bool operator> (unspecified, weak_ordering v) noexcept;
| ^
p530.cpp:69:16: error: declaration of 'operator<=' as non-function
69 | constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~
p530.cpp:69:27: error: 'unspecified' was not declared in this scope
69 | constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~~~
p530.cpp:69:54: error: expected primary-expression before 'v'
69 | constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
| ^
p530.cpp:70:16: error: declaration of 'operator>=' as non-function
70 | constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~
p530.cpp:70:27: error: 'unspecified' was not declared in this scope
70 | constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~~~
p530.cpp:70:54: error: expected primary-expression before 'v'
70 | constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
| ^
p530.cpp:72:54: error: 'unspecified' has not been declared
72 | constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
| ^~~~~~~~~~~
p530.cpp:74:25: error: declaration of 'operator<=>' as non-function
74 | constexpr weak_ordering operator<=>(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~
p530.cpp:74:37: error: 'unspecified' was not declared in this scope
74 | constexpr weak_ordering operator<=>(unspecified, weak_ordering v) noexcept;
| ^~~~~~~~~~~
p530.cpp:74:64: error: expected primary-expression before 'v'
74 | constexpr weak_ordering operator<=>(unspecified, weak_ordering v) noexcept;
| ^
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。＞
文書履歴(document history)
ver. 0.01 初稿 20220710