rss.xml

<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
  <title>cpprefjp - C++日本語リファレンス</title>
  <link href="https://cpprefjp.github.io" />
  <updated>2026-06-01T19:31:20.697112</updated>
  <id>10e43d77-081b-4cab-a536-3006336b649a</id>

  
    <entry>
      <title>concat_view -- views::concat : Clang 23で実装されたので動作確認した</title>
      <link href="https://cpprefjp.github.io/reference/ranges/concat_view.html"/>
      <id>c41fb937271566602f01b35d4f6c34931f9c44ad:reference/ranges/concat_view.md</id>
      <updated>2026-06-01T18:02:12+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/ranges/concat_view.md b/reference/ranges/concat_view.md
index 69bb43888..a7848b13c 100644
--- a/reference/ranges/concat_view.md
+++ b/reference/ranges/concat_view.md
@@ -133,7 +133,10 @@ namespace std::ranges {
 
 ## 例
 ```cpp example
-import std;
+#include &amp;lt;vector&amp;gt;
+#include &amp;lt;array&amp;gt;
+#include &amp;lt;ranges&amp;gt;
+#include &amp;lt;print&amp;gt;
 
 int main() {
   std::vector&amp;lt;int&amp;gt; v1{1, 2, 3}, v2{4, 5}, v3{};
@@ -155,7 +158,7 @@ int main() {
 - C++26
 
 ### 処理系
-- [Clang](/implementation.md#clang): 20 [mark noimpl]
+- [Clang](/implementation.md#clang): 23 [mark verified]
 - [GCC](/implementation.md#gcc): 15 [mark verified]
 - [Visual C++](/implementation.md#visual_cpp): 2022 Update 14 [mark noimpl]
 
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Akira Takahashi</name>
        <email>faithandbrave@gmail.com</email>
      </author>
    </entry>
  
    <entry>
      <title>begin -- views::concat : Clang 23で実装されたので動作確認した</title>
      <link href="https://cpprefjp.github.io/reference/ranges/concat_view/begin.html"/>
      <id>c41fb937271566602f01b35d4f6c34931f9c44ad:reference/ranges/concat_view/begin.md</id>
      <updated>2026-06-01T18:02:12+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/ranges/concat_view/begin.md b/reference/ranges/concat_view/begin.md
index 01986d7ae..23ee0487a 100644
--- a/reference/ranges/concat_view/begin.md
+++ b/reference/ranges/concat_view/begin.md
@@ -54,6 +54,6 @@ int main() {
 - C++26
 
 ### 処理系
-- [Clang](/implementation.md#clang): 20 [mark noimpl]
+- [Clang](/implementation.md#clang): 23 [mark verified]
 - [GCC](/implementation.md#gcc): 15 [mark verified]
 - [Visual C++](/implementation.md#visual_cpp): 2022 Update 14 [mark noimpl]
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Akira Takahashi</name>
        <email>faithandbrave@gmail.com</email>
      </author>
    </entry>
  
    <entry>
      <title>end -- views::concat : Clang 23で実装されたので動作確認した</title>
      <link href="https://cpprefjp.github.io/reference/ranges/concat_view/end.html"/>
      <id>c41fb937271566602f01b35d4f6c34931f9c44ad:reference/ranges/concat_view/end.md</id>
      <updated>2026-06-01T18:02:12+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/ranges/concat_view/end.md b/reference/ranges/concat_view/end.md
index 992c02a50..df17e204b 100644
--- a/reference/ranges/concat_view/end.md
+++ b/reference/ranges/concat_view/end.md
@@ -57,6 +57,6 @@ int main() {
 - C++26
 
 ### 処理系
-- [Clang](/implementation.md#clang): 20 [mark noimpl]
+- [Clang](/implementation.md#clang): 23 [mark verified]
 - [GCC](/implementation.md#gcc): 15 [mark verified]
 - [Visual C++](/implementation.md#visual_cpp): 2022 Update 14 [mark noimpl]
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Akira Takahashi</name>
        <email>faithandbrave@gmail.com</email>
      </author>
    </entry>
  
    <entry>
      <title>コンストラクタ -- views::concat : Clang 23で実装されたので動作確認した</title>
      <link href="https://cpprefjp.github.io/reference/ranges/concat_view/op_constructor.html"/>
      <id>c41fb937271566602f01b35d4f6c34931f9c44ad:reference/ranges/concat_view/op_constructor.md</id>
      <updated>2026-06-01T18:02:12+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/ranges/concat_view/op_constructor.md b/reference/ranges/concat_view/op_constructor.md
index 0d1be8934..78f6057a1 100644
--- a/reference/ranges/concat_view/op_constructor.md
+++ b/reference/ranges/concat_view/op_constructor.md
@@ -56,6 +56,6 @@ int main() {
 - C++26
 
 ### 処理系
-- [Clang](/implementation.md#clang): 20 [mark noimpl]
+- [Clang](/implementation.md#clang): 23 [mark verified]
 - [GCC](/implementation.md#gcc): 15 [mark verified]
 - [Visual C++](/implementation.md#visual_cpp): 2022 Update 14 [mark noimpl]
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Akira Takahashi</name>
        <email>faithandbrave@gmail.com</email>
      </author>
    </entry>
  
    <entry>
      <title>推論補助 -- views::concat : Clang 23で実装されたので動作確認した</title>
      <link href="https://cpprefjp.github.io/reference/ranges/concat_view/op_deduction_guide.html"/>
      <id>c41fb937271566602f01b35d4f6c34931f9c44ad:reference/ranges/concat_view/op_deduction_guide.md</id>
      <updated>2026-06-01T18:02:12+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/ranges/concat_view/op_deduction_guide.md b/reference/ranges/concat_view/op_deduction_guide.md
index 0f91c5166..fbedf37ac 100644
--- a/reference/ranges/concat_view/op_deduction_guide.md
+++ b/reference/ranges/concat_view/op_deduction_guide.md
@@ -65,6 +65,6 @@ int main() {
 - C++26
 
 ### 処理系
-- [Clang](/implementation.md#clang): 20 [mark noimpl]
+- [Clang](/implementation.md#clang): 23 [mark verified]
 - [GCC](/implementation.md#gcc): 15 [mark verified]
 - [Visual C++](/implementation.md#visual_cpp): 2022 Update 14 [mark noimpl]
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Akira Takahashi</name>
        <email>faithandbrave@gmail.com</email>
      </author>
    </entry>
  
    <entry>
      <title>size -- views::concat : Clang 23で実装されたので動作確認した</title>
      <link href="https://cpprefjp.github.io/reference/ranges/concat_view/size.html"/>
      <id>c41fb937271566602f01b35d4f6c34931f9c44ad:reference/ranges/concat_view/size.md</id>
      <updated>2026-06-01T18:02:12+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/ranges/concat_view/size.md b/reference/ranges/concat_view/size.md
index 8fd66ab5d..33e9b3caf 100644
--- a/reference/ranges/concat_view/size.md
+++ b/reference/ranges/concat_view/size.md
@@ -63,6 +63,6 @@ distance: 8
 - C++26
 
 ### 処理系
-- [Clang](/implementation.md#clang): 20 [mark noimpl]
+- [Clang](/implementation.md#clang): 23 [mark verified]
 - [GCC](/implementation.md#gcc): 15 [mark verified]
 - [Visual C++](/implementation.md#visual_cpp): 2022 Update 14 [mark noimpl]
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Akira Takahashi</name>
        <email>faithandbrave@gmail.com</email>
      </author>
    </entry>
  
    <entry>
      <title>handle -- Update handle.md</title>
      <link href="https://cpprefjp.github.io/reference/format/basic_format_arg/handle.html"/>
      <id>2b9d9db61e0a59c9dd609023ab1658490d203582:reference/format/basic_format_arg/handle.md</id>
      <updated>2026-06-01T03:20:27+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/format/basic_format_arg/handle.md b/reference/format/basic_format_arg/handle.md
index c4344d873..7c7d88e1d 100644
--- a/reference/format/basic_format_arg/handle.md
+++ b/reference/format/basic_format_arg/handle.md
@@ -35,7 +35,7 @@ namespace std {
 
     template&amp;lt;class T&amp;gt; explicit handle(const T&amp;amp; val) noexcept
       :ptr_(addressof(val))
-      ,format_function(
+      ,format_(
         [](basic_format_parse_context&amp;lt;charT&amp;gt;&amp;amp; parse_ctx, Context&amp;amp; format_ctx, const void* ptr) {
           typename Context::template formatter_type&amp;lt;T&amp;gt; f;
           parse_ctx.advance_to(f.parse(parse_ctx));
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Tetsuro Matsumura</name>
        <email>matsumura.t.lab@gmail.com</email>
      </author>
    </entry>
  
    <entry>
      <title>コンストラクタ -- Update basic_format_arg/op_constructor.md</title>
      <link href="https://cpprefjp.github.io/reference/format/basic_format_arg/op_constructor.html"/>
      <id>82fa1accd3f9cb922a8728491ee3f2d820e267a2:reference/format/basic_format_arg/op_constructor.md</id>
      <updated>2026-06-01T03:17:56+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/format/basic_format_arg/op_constructor.md b/reference/format/basic_format_arg/op_constructor.md
index 1d1958ca8..d4b02745c 100644
--- a/reference/format/basic_format_arg/op_constructor.md
+++ b/reference/format/basic_format_arg/op_constructor.md
@@ -45,7 +45,8 @@ namespace std {
 ## テンプレートパラメーター制約
 
 - (2):
-    - `T`はフォーマットできる型であること
+    - (C++20) `T`はフォーマットできる型であること
+    - (C++23) `T`は [`formattable-with`](../formattable.md)`&amp;lt;Context&amp;gt;`を満たすこと
 
 ## 事前条件
 
@@ -91,4 +92,4 @@ namespace std {
 
 - [P0645R10 Text Formatting](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0645r10.html)
 - [P3391R2 `constexpr std::format`](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3391r2.html)
-    - C++26から`constexpr`に対応した
\ No newline at end of file
+    - C++26から`constexpr`に対応した
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Tetsuro Matsumura</name>
        <email>matsumura.t.lab@gmail.com</email>
      </author>
    </entry>
  
    <entry>
      <title>formattable -- Update formattable.md</title>
      <link href="https://cpprefjp.github.io/reference/format/formattable.html"/>
      <id>7884e2f3d9bb5a283294f0c17b4ebe930ccd0b75:reference/format/formattable.md</id>
      <updated>2026-05-30T21:10:14+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/format/formattable.md b/reference/format/formattable.md
index c71e840cf..e4ea4fb04 100644
--- a/reference/format/formattable.md
+++ b/reference/format/formattable.md
@@ -16,7 +16,7 @@ namespace std {
              const Formatter&amp;amp; cf,
              T&amp;amp;&amp;amp; t,
              Context fc,
-             basic_format_parse_context&amp;lt;charT&amp;gt; pc) {
+             basic_format_parse_context&amp;lt;typename Context::char_type&amp;gt; pc) {
       { f.parse(pc) } -&amp;gt; same_as&amp;lt;typename decltype(pc)::iterator&amp;gt;;
       { cf.format(t, fc) } -&amp;gt; same_as&amp;lt;typename Context::iterator&amp;gt;;
     };
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Tetsuro Matsumura</name>
        <email>matsumura.t.lab@gmail.com</email>
      </author>
    </entry>
  
    <entry>
      <title>formattable -- Update formattable.md</title>
      <link href="https://cpprefjp.github.io/reference/format/formattable.html"/>
      <id>641ed17ce44326bfe6ceee11ed0f9affc7f31f83:reference/format/formattable.md</id>
      <updated>2026-05-30T17:33:15+09:00</updated>
      
        <summary type="html">&lt;pre&gt;&lt;code&gt;diff --git a/reference/format/formattable.md b/reference/format/formattable.md
index e040cd16f..c71e840cf 100644
--- a/reference/format/formattable.md
+++ b/reference/format/formattable.md
@@ -9,21 +9,26 @@ namespace std {
   template &amp;lt;class charT&amp;gt;
   using fmt-iter-for = unspecified;
 
-  template &amp;lt;class T, class charT&amp;gt;
-  concept formattable =
-    semiregular&amp;lt;formatter&amp;lt;remove_cvref_t&amp;lt;T&amp;gt;, charT&amp;gt;&amp;gt; &amp;amp;&amp;amp;
-    requires(formatter&amp;lt;remove_cvref_t&amp;lt;T&amp;gt;, charT&amp;gt; f,
-             const formatter&amp;lt;remove_cvref_t&amp;lt;T&amp;gt;, charT&amp;gt; cf,
-             T t,
-             basic_format_context&amp;lt;fmt-iter-for&amp;lt;charT&amp;gt;, charT&amp;gt; fc,
+  template &amp;lt;class T, class Context, class Formatter = typename Context::template formatter_type&amp;lt;remove_const_t&amp;lt;T&amp;gt;&amp;gt;&amp;gt;&amp;gt;
+  concept formattable-with = // 説明専用
+    semiregular&amp;lt;Formatter&amp;gt; &amp;amp;&amp;amp;
+    requires(Formatter&amp;amp; f,
+             const Formatter&amp;amp; cf,
+             T&amp;amp;&amp;amp; t,
+             Context fc,
              basic_format_parse_context&amp;lt;charT&amp;gt; pc) {
-      { f.parse(pc) } -&amp;gt; same_as&amp;lt;basic_format_parse_context&amp;lt;charT&amp;gt;::iterator&amp;gt;;
-      { cf.format(t, fc) } -&amp;gt; same_as&amp;lt;fmt-iter-for&amp;lt;charT&amp;gt;&amp;gt;;
+      { f.parse(pc) } -&amp;gt; same_as&amp;lt;typename decltype(pc)::iterator&amp;gt;;
+      { cf.format(t, fc) } -&amp;gt; same_as&amp;lt;typename Context::iterator&amp;gt;;
     };
+
+  template &amp;lt;class T, class charT&amp;gt;
+  concept formattable =
+    formattable-with&amp;lt;remove_reference_t&amp;lt;T&amp;gt;, basic_format_context&amp;lt;fmt-iter-for&amp;lt;charT&amp;gt;&amp;gt;&amp;gt;;
 }
 ```
 * fmt-iter-for[italic]
 * unspecified[italic]
+* formattable-with[italic]
 * formatter[link formatter.md]
 * semiregular[link /reference/concepts/semiregular.md]
 * basic_format_context[link basic_format_context.md]
@@ -73,3 +78,4 @@ hello
 
 ## 参照
 - [P2286R8 Formatting Ranges](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2286r8.html)
+- [N4950 22.14.6.2 Concept formattable](https://timsong-cpp.github.io/cppwp/n4950/format.formattable#concept:formattable-with)
&lt;/code&gt;&lt;/pre&gt;</summary>
      
      <author>
        <name>Tetsuro Matsumura</name>
        <email>matsumura.t.lab@gmail.com</email>
      </author>
    </entry>
  
</feed>