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.

7.6.17 Yielding a value [expr.yield] C++N4910:2022 (66) p146.cpp

算譜(source code)

p146.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 * msg="7.6.17 Yielding a value [expr.yield] C++N4910:2022 (66) p146.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 <cstdlib> 
#include <cstring>
#include <cassert>
#include <coroutine>

using namespace std;

// Example 1 
template <typename T>
struct my_generator {
struct promise_type {
T current_value;
/* ... */
auto yield_value(T v) {
current_value = std::move(v);
return std::suspend_always{};
}
};
struct iterator { /* ... */ };
iterator begin();
iterator end();
};
my_generator<pair<int,int>> g1() {
for (int i = i; i < 10; ++i) co_yield {i,i};
}
my_generator<pair<int,int>> g2() {
for (int i = i; i < 10; ++i) co_yield make_pair(i,i);
}
auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
int a[] = { co_yield 1 }; // error: yield-expression outside of function suspension context
int main() {
auto r1 = g1();
auto r2 = g2();
assert(std::equal(r1.begin(), r1.end(), r2.begin(), r2.end()));
// int main() {
  cout  <<  msg << 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  p146
rm: cannot remove 'p146l': No such file or directory
rm: cannot remove 'p146g': No such file or directory
$ clang++ p146.cpp -std=03 -o p146l -I. -Wall
p146.cpp:24:1: warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
auto yield_value(T v) {
^
p146.cpp:24:1: error: 'auto' not allowed in function return type
auto yield_value(T v) {
^~~~
p146.cpp:25:22: error: no member named 'move' in namespace 'std'
current_value = std::move(v);
                ~~~~~^
p146.cpp:26:13: error: no member named 'suspend_always' in namespace 'std'
return std::suspend_always{};
       ~~~~~^
p146.cpp:26:27: error: expected ';' after return statement
return std::suspend_always{};
                          ^
                          ;
p146.cpp:33:26: error: a space is required between consecutive right angle brackets (use '> >')
my_generator<pair<int,int>> g1() {
                         ^~
                         > >
p146.cpp:34:30: error: use of undeclared identifier 'co_yield'
for (int i = i; i < 10; ++i) co_yield {i,i};
                             ^
p146.cpp:36:26: error: a space is required between consecutive right angle brackets (use '> >')
my_generator<pair<int,int>> g2() {
                         ^~
                         > >
p146.cpp:37:30: error: unknown type name 'co_yield'
for (int i = i; i < 10; ++i) co_yield make_pair(i,i);
                             ^
p146.cpp:39:1: warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
^
p146.cpp:39:16: error: use of undeclared identifier 'co_yield'
auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
               ^
p146.cpp:39:1: error: 'auto' not allowed in function return type
auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
^~~~
p146.cpp:40:13: error: use of undeclared identifier 'co_yield'
int a[] = { co_yield 1 }; // error: yield-expression outside of function suspension context
            ^
p146.cpp:42:1: warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
auto r1 = g1();
^
p146.cpp:43:1: warning: 'auto' type specifier is a C++11 extension [-Wc++11-extensions]
auto r2 = g2();
^
In file included from p146.cpp:10:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/iostream:39:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/ostream:38:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/ios:40:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/char_traits.h:39:
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/stl_algobase.h:1443:23: error: invalid operands to binary expression ('my_generator<std::pair<int, int> >::iterator' and 'my_generator<std::pair<int, int> >::iterator')
      for (; __first1 != __last1; ++__first1, (void)++__first2)
             ~~~~~~~~ ^  ~~~~~~~
p146.cpp:44:13: note: in instantiation of function template specialization 'std::equal<my_generator<std::pair<int, int> >::iterator, my_generator<std::pair<int, int> >::iterator, my_generator<std::pair<int, int> >::iterator>' requested here
assert(std::equal(r1.begin(), r1.end(), r2.begin(), r2.end()));
            ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/postypes.h:227:5: note: candidate template ignored: could not match 'fpos<_StateT>' against 'my_generator<std::pair<int, int> >::iterator'
    operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
    ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/stl_pair.h:496:5: note: candidate template ignored: could not match 'pair<_T1, _T2>' against 'my_generator<std::pair<int, int> >::iterator'
    operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
    ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/stl_iterator.h:397:5: note: candidate template ignored: could not match 'reverse_iterator<_Iterator>' against 'my_generator<std::pair<int, int> >::iterator'
    operator!=(const reverse_iterator<_Iterator>& __x,
    ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/stl_iterator.h:435:5: note: candidate template ignored: could not match 'reverse_iterator<_IteratorL>' against 'my_generator<std::pair<int, int> >::iterator'
    operator!=(const reverse_iterator<_IteratorL>& __x,
    ^
4 warnings and 12 errors generated.
rm: cannot remove 'p146l': No such file or directory
$ clang++ p146.cpp -std=2b -o p146l -I. -Wall
p146.cpp:33:29: error: no member named 'initial_suspend' in 'my_generator<std::pair<int, int>>::promise_type'
my_generator<pair<int,int>> g1() {
                            ^~
p146.cpp:36:29: error: no member named 'initial_suspend' in 'my_generator<std::pair<int, int>>::promise_type'
my_generator<pair<int,int>> g2() {
                            ^~
p146.cpp:39:16: error: 'co_yield' cannot be used outside a function
auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
               ^
p146.cpp:40:13: error: 'co_yield' cannot be used outside a function
int a[] = { co_yield 1 }; // error: yield-expression outside of function suspension context
            ^
4 errors generated.

$ g++ p146.cpp -std=03 -o p146g -I. -Wall
p146.cpp:24:1: warning: 'auto' changes meaning in C++11; please remove it [-Wc++11-compat]
   24 | auto yield_value(T v) {
      | ^~~~
      | ----
p146.cpp:24:6: error: ISO C++ forbids declaration of 'yield_value' with no type [-fpermissive]
   24 | auto yield_value(T v) {
      |      ^~~~~~~~~~~
p146.cpp:24:1: error: storage class specified for 'yield_value'
   24 | auto yield_value(T v) {
      | ^~~~
p146.cpp: In member function 'int my_generator<T>::promise_type::yield_value(T)':
p146.cpp:25:22: error: 'move' is not a member of 'std'
   25 | current_value = std::move(v);
      |                      ^~~~
p146.cpp:25:22: note: 'std::move' is only available from C++11 onwards
p146.cpp:26:13: error: 'suspend_always' is not a member of 'std'
   26 | return std::suspend_always{};
      |             ^~~~~~~~~~~~~~
p146.cpp:26:27: error: expected ';' before '{' token
   26 | return std::suspend_always{};
      |                           ^
p146.cpp: At global scope:
p146.cpp:33:26: error: '>>' should be '> >' within a nested template argument list
   33 | my_generator<pair<int,int>> g1() {
      |                          ^~
      |                          > >
p146.cpp: In function 'my_generator<std::pair<int, int> > g1()':
p146.cpp:34:30: error: 'co_yield' was not declared in this scope; did you mean 'sched_yield'?
   34 | for (int i = i; i < 10; ++i) co_yield {i,i};
      |                              ^~~~~~~~
      |                              sched_yield
p146.cpp:35:1: warning: no return statement in function returning non-void [-Wreturn-type]
   35 | }
      | ^
p146.cpp: At global scope:
p146.cpp:36:26: error: '>>' should be '> >' within a nested template argument list
   36 | my_generator<pair<int,int>> g2() {
      |                          ^~
      |                          > >
p146.cpp: In function 'my_generator<std::pair<int, int> > g2()':
p146.cpp:37:30: error: 'co_yield' was not declared in this scope; did you mean 'sched_yield'?
   37 | for (int i = i; i < 10; ++i) co_yield make_pair(i,i);
      |                              ^~~~~~~~
      |                              sched_yield
p146.cpp:38:1: warning: no return statement in function returning non-void [-Wreturn-type]
   38 | }
      | ^
p146.cpp: At global scope:
p146.cpp:39:1: warning: 'auto' changes meaning in C++11; please remove it [-Wc++11-compat]
   39 | auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
      | ^~~~
      | ----
p146.cpp:39:16: error: 'co_yield' was not declared in this scope; did you mean 'sched_yield'?
   39 | auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
      |                ^~~~~~~~
      |                sched_yield
p146.cpp:39:25: error: expected ',' or '...' before numeric constant
   39 | auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
      |                         ^
p146.cpp:39:6: error: ISO C++ forbids declaration of 'f' with no type [-fpermissive]
   39 | auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
      |      ^
p146.cpp:39:1: error: top-level declaration of 'f' specifies 'auto'
   39 | auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
      | ^~~~
p146.cpp:39:1: error: storage class 'auto' invalid for function 'f'
p146.cpp:40:13: error: 'co_yield' was not declared in this scope; did you mean 'sched_yield'?
   40 | int a[] = { co_yield 1 }; // error: yield-expression outside of function suspension context
      |             ^~~~~~~~
      |             sched_yield
p146.cpp:40:22: error: expected '}' before numeric constant
   40 | int a[] = { co_yield 1 }; // error: yield-expression outside of function suspension context
      |           ~          ^
p146.cpp:40:24: error: expected declaration before '}' token
   40 | int a[] = { co_yield 1 }; // error: yield-expression outside of function suspension context
      |                        ^
p146.cpp: In function 'int main()':
p146.cpp:42:1: warning: 'auto' changes meaning in C++11; please remove it [-Wc++11-compat]
   42 | auto r1 = g1();
      | ^~~~
      | ----
p146.cpp:42:6: error: 'r1' does not name a type
   42 | auto r1 = g1();
      |      ^~
p146.cpp:43:1: warning: 'auto' changes meaning in C++11; please remove it [-Wc++11-compat]
   43 | auto r2 = g2();
      | ^~~~
      | ----
p146.cpp:43:6: error: 'r2' does not name a type
   43 | auto r2 = g2();
      |      ^~
In file included from /usr/local/include/c++/12.1.0/cassert:44,
                 from p146.cpp:13:
p146.cpp:44:19: error: 'r1' was not declared in this scope; did you mean 'g1'?
   44 | assert(std::equal(r1.begin(), r1.end(), r2.begin(), r2.end()));
      |                   ^~
p146.cpp:44:41: error: 'r2' was not declared in this scope; did you mean 'g2'?
   44 | assert(std::equal(r1.begin(), r1.end(), r2.begin(), r2.end()));
      |                                         ^~
rm: cannot remove 'p146g': No such file or directory

$ g++ p146.cpp -std=2b -o p146g -I. -Wall
p146.cpp: In function 'my_generator<std::pair<int, int> > g1()':
p146.cpp:33:29: error: no member named 'initial_suspend' in 'std::__n4861::__coroutine_traits_impl<my_generator<std::pair<int, int> >, void>::promise_type' {aka 'my_generator<std::pair<int, int> >::promise_type'}
   33 | my_generator<pair<int,int>> g1() {
      |                             ^~
p146.cpp:33:29: error: no member named 'unhandled_exception' in 'std::__n4861::__coroutine_traits_impl<my_generator<std::pair<int, int> >, void>::promise_type' {aka 'my_generator<std::pair<int, int> >::promise_type'}
p146.cpp:33:29: error: no member named 'final_suspend' in 'std::__n4861::__coroutine_traits_impl<my_generator<std::pair<int, int> >, void>::promise_type' {aka 'my_generator<std::pair<int, int> >::promise_type'}
p146.cpp:33:29: error: no member named 'get_return_object' in 'std::__n4861::__coroutine_traits_impl<my_generator<std::pair<int, int> >, void>::promise_type' {aka 'my_generator<std::pair<int, int> >::promise_type'}
p146.cpp: In function 'my_generator<std::pair<int, int> > g2()':
p146.cpp:36:29: error: no member named 'initial_suspend' in 'std::__n4861::__coroutine_traits_impl<my_generator<std::pair<int, int> >, void>::promise_type' {aka 'my_generator<std::pair<int, int> >::promise_type'}
   36 | my_generator<pair<int,int>> g2() {
      |                             ^~
p146.cpp:36:29: error: no member named 'unhandled_exception' in 'std::__n4861::__coroutine_traits_impl<my_generator<std::pair<int, int> >, void>::promise_type' {aka 'my_generator<std::pair<int, int> >::promise_type'}
p146.cpp:36:29: error: no member named 'final_suspend' in 'std::__n4861::__coroutine_traits_impl<my_generator<std::pair<int, int> >, void>::promise_type' {aka 'my_generator<std::pair<int, int> >::promise_type'}
p146.cpp:36:29: error: no member named 'get_return_object' in 'std::__n4861::__coroutine_traits_impl<my_generator<std::pair<int, int> >, void>::promise_type' {aka 'my_generator<std::pair<int, int> >::promise_type'}
p146.cpp: At global scope:
p146.cpp:39:16: error: 'co_yield' cannot be used outside a function
   39 | auto f(int x = co_yield 5); // error: yield-expression outside of function suspension context
      |                ^~~~~~~~
p146.cpp:40:13: error: 'co_yield' cannot be used outside a function
   40 | int a[] = { co_yield 1 }; // error: yield-expression outside of function suspension context
      |             ^~~~~~~~
In file included from /usr/local/include/c++/12.1.0/string:50,
                 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 p146.cpp:10:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h: In instantiation of 'constexpr bool std::__equal4(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]':
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1677:38:   required from 'constexpr bool std::equal(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]'
p146.cpp:44:1:   required from here
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1598:13: error: no type named 'iterator_category' in 'struct std::iterator_traits<my_generator<std::pair<int, int> >::iterator>'
 1598 |       using _Cat1 = typename iterator_traits<_II1>::iterator_category;
      |             ^~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1599:13: error: no type named 'iterator_category' in 'struct std::iterator_traits<my_generator<std::pair<int, int> >::iterator>'
 1599 |       using _Cat2 = typename iterator_traits<_II2>::iterator_category;
      |             ^~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1600:13: error: no type named 'iterator_category' in 'struct std::iterator_traits<my_generator<std::pair<int, int> >::iterator>'
 1600 |       using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
      |             ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1603:36: error: no matching function for call to 'distance(my_generator<std::pair<int, int> >::iterator&, my_generator<std::pair<int, int> >::iterator&)'
 1603 |           auto __d1 = std::distance(__first1, __last1);
      |                       ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/bits/stl_construct.h:62,
                 from /usr/local/include/c++/12.1.0/bits/char_traits.h:46,
                 from /usr/local/include/c++/12.1.0/ios:40:
/usr/local/include/c++/12.1.0/bits/stl_iterator_base_funcs.h:146:5: note: candidate: 'template<class _InputIterator> constexpr typename std::iterator_traits<_Iterator>::difference_type std::distance(_InputIterator, _InputIterator)'
  146 |     distance(_InputIterator __first, _InputIterator __last)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator_base_funcs.h:146:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_iterator_base_funcs.h: In substitution of 'template<class _InputIterator> constexpr typename std::iterator_traits<_Iterator>::difference_type std::distance(_InputIterator, _InputIterator) [with _InputIterator = my_generator<std::pair<int, int> >::iterator]':
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1603:29:   required from 'constexpr bool std::__equal4(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]'
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1677:38:   required from 'constexpr bool std::equal(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]'
p146.cpp:44:1:   required from here
/usr/local/include/c++/12.1.0/bits/stl_iterator_base_funcs.h:146:5: error: no type named 'difference_type' in 'struct std::iterator_traits<my_generator<std::pair<int, int> >::iterator>'
/usr/local/include/c++/12.1.0/bits/stl_algobase.h: In instantiation of 'constexpr bool std::__equal4(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]':
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1677:38:   required from 'constexpr bool std::equal(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]'
p146.cpp:44:1:   required from here
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1604:36: error: no matching function for call to 'distance(my_generator<std::pair<int, int> >::iterator&, my_generator<std::pair<int, int> >::iterator&)'
 1604 |           auto __d2 = std::distance(__first2, __last2);
      |                       ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator_base_funcs.h:146:5: note: candidate: 'template<class _InputIterator> constexpr typename std::iterator_traits<_Iterator>::difference_type std::distance(_InputIterator, _InputIterator)'
  146 |     distance(_InputIterator __first, _InputIterator __last)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator_base_funcs.h:146:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_iterator_base_funcs.h: In substitution of 'template<class _InputIterator> constexpr typename std::iterator_traits<_Iterator>::difference_type std::distance(_InputIterator, _InputIterator) [with _InputIterator = my_generator<std::pair<int, int> >::iterator]':
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1604:29:   required from 'constexpr bool std::__equal4(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]'
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1677:38:   required from 'constexpr bool std::equal(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]'
p146.cpp:44:1:   required from here
/usr/local/include/c++/12.1.0/bits/stl_iterator_base_funcs.h:146:5: error: no type named 'difference_type' in 'struct std::iterator_traits<my_generator<std::pair<int, int> >::iterator>'
/usr/local/include/c++/12.1.0/bits/stl_algobase.h: In instantiation of 'constexpr bool std::__equal4(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]':
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1677:38:   required from 'constexpr bool std::equal(_II1, _II1, _II2, _II2) [with _II1 = my_generator<pair<int, int> >::iterator; _II2 = my_generator<pair<int, int> >::iterator]'
p146.cpp:44:1:   required from here
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: error: no match for 'operator!=' (operand types are 'my_generator<std::pair<int, int> >::iterator' and 'my_generator<std::pair<int, int> >::iterator')
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/string:41:
/usr/local/include/c++/12.1.0/bits/allocator.h:214:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)' (reversed)
  214 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/allocator.h:214:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::allocator<_CharT>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/string:47:
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:530:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed)
  530 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:530:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1656:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed)
 1656 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1656:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/iosfwd:40,
                 from /usr/local/include/c++/12.1.0/ios:38:
/usr/local/include/c++/12.1.0/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)' (rewritten)
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::fpos<_StateT>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:589:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorL>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (rewritten)
  589 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:589:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1726:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)' (rewritten)
 1726 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1726:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
In file included from /usr/local/include/c++/12.1.0/bits/stl_algobase.h:64:
/usr/local/include/c++/12.1.0/bits/stl_pair.h:640:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)' (rewritten)
  640 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_pair.h:640:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::pair<_T1, _T2>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:197:5: note: candidate: 'template<class _StateT> bool std::operator!=(const fpos<_StateT>&, const fpos<_StateT>&)'
  197 |     operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:197:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::fpos<_StateT>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:538:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&) requires requires{{std::operator!=::__x->base() != std::operator!=::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}'
  538 |     operator!=(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:538:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: error: no match for 'operator!=' (operand types are 'my_generator<std::pair<int, int> >::iterator' and 'my_generator<std::pair<int, int> >::iterator')
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/allocator.h:214:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)' (reversed)
  214 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/allocator.h:214:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::allocator<_CharT>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:530:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed)
  530 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:530:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1656:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed)
 1656 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1656:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)' (rewritten)
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::fpos<_StateT>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:589:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorL>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (rewritten)
  589 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:589:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1726:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)' (rewritten)
 1726 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1726:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_pair.h:640:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)' (rewritten)
  640 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_pair.h:640:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::pair<_T1, _T2>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:197:5: note: candidate: 'template<class _StateT> bool std::operator!=(const fpos<_StateT>&, const fpos<_StateT>&)'
  197 |     operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:197:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::fpos<_StateT>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:538:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&) requires requires{{std::operator!=::__x->base() != std::operator!=::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}'
  538 |     operator!=(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:538:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1610:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1610 |       for (; __first1 != __last1 && __first2 != __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1611:11: error: no match for 'operator++' (operand type is 'my_generator<std::pair<int, int> >::iterator')
 1611 |           ++__first1, (void)++__first2)
      |           ^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1611:29: error: no match for 'operator++' (operand type is 'my_generator<std::pair<int, int> >::iterator')
 1611 |           ++__first1, (void)++__first2)
      |                             ^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1612:15: error: no match for 'operator*' (operand type is 'my_generator<std::pair<int, int> >::iterator')
 1612 |         if (!(*__first1 == *__first2))
      |               ^~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1612:28: error: no match for 'operator*' (operand type is 'my_generator<std::pair<int, int> >::iterator')
 1612 |         if (!(*__first1 == *__first2))
      |                            ^~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:23: error: no match for 'operator==' (operand types are 'my_generator<std::pair<int, int> >::iterator' and 'my_generator<std::pair<int, int> >::iterator')
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/allocator.h:214:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)' (reversed)
  214 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/allocator.h:214:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::allocator<_CharT>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:530:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed)
  530 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:530:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1656:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed)
 1656 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1656:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::fpos<_StateT>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:589:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorL>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}'
  589 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:589:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1726:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1726 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1726:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_pair.h:640:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
  640 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_pair.h:640:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:23: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::pair<_T1, _T2>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |              ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:46: error: no match for 'operator==' (operand types are 'my_generator<std::pair<int, int> >::iterator' and 'my_generator<std::pair<int, int> >::iterator')
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/allocator.h:214:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)' (reversed)
  214 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/allocator.h:214:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::allocator<_CharT>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:530:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed)
  530 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:530:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1656:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}' (reversed)
 1656 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1656:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::fpos<_StateT>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:589:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorL>&) requires requires{{std::operator==::__x->base() == std::operator==::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}'
  589 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:589:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::reverse_iterator<_IteratorL>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1726:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1726 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_iterator.h:1726:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_pair.h:640:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
  640 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/local/include/c++/12.1.0/bits/stl_pair.h:640:5: note:   template argument deduction/substitution failed:
/usr/local/include/c++/12.1.0/bits/stl_algobase.h:1614:46: note:   'my_generator<std::pair<int, int> >::iterator' is not derived from 'const std::pair<_T1, _T2>'
 1614 |       return __first1 == __last1 && __first2 == __last2;
      |                                     ~~~~~~~~~^~~~~~~~~~

検討事項(agenda)

リンクエラーの理由を解説する。

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＜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　20220623