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<header data-kunai-mdinfo="{"meta": {"header": ["format"], "id-type": ["class template"], "namespace": ["std"], "cpp": ["cpp23"]}, "sources": [{"id": "ba43ff747e7dbd9df98ace5e1eb36bb66305ba5e", "source": "#include <iostream>\n#include <format>\n#include <vector>\n\ntemplate <class T>\nclass MyVector {\n std::vector<T> v_;\npublic:\n using base_type = std::vector<T>;\n using iterator = typename base_type::iterator;\n using const_iterator = typename base_type::const_iterator;\n using value_type = typename base_type::value_type;\n using reference = typename base_type::reference;\n using const_reference = typename base_type::const_reference;\n\n MyVector() = default;\n MyVector(std::initializer_list<T> init)\n : v_(init.begin(), init.end()) {}\n\n iterator begin() { return v_.begin(); }\n const_iterator begin() const { return v_.begin(); }\n\n iterator end() { return v_.end(); }\n const_iterator end() const { return v_.end(); }\n\n const std::vector<T>& base() const { return v_; }\n};\n\ntemplate <class T>\nconstexpr std::range_format std::format_kind<MyVector<T>> = std::range_format::sequence;\n\ntemplate <class T>\nclass std::formatter<MyVector<T>> : public std::range_formatter<T> {\n bool is_colon = false;\n using base_type = std::range_formatter<T>;\npublic:\n\n // \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u66f8\u5f0f\u6587\u5b57\u5217\u306e\u89e3\u6790\u304c\u3042\u308b\u305f\u3081\u3001\n // constexpr\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\n // \u3053\u306e\u95a2\u6570\u306b\u6e21\u3055\u308c\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u3001{:c:02x}\u306ec\u4ee5\u964d\u3002\n // \u89e3\u6790\u304c\u304a\u308f\u3063\u305f\u5834\u6240\u3092\u6307\u3059\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u8fd4\u3059\u3002\n constexpr auto parse(std::format_parse_context& pctx) {\n auto it = pctx.begin();\n if (*it == 'c') {\n is_colon = true;\n ++it;\n }\n pctx.advance_to(it);\n return base_type::parse(pctx);\n }\n\n // format()\u95a2\u6570\u306f\u66f8\u5f0f\u306e\u60c5\u5831\u3092\u3082\u305f\u306a\u3044\u3002\n // parse()\u95a2\u6570\u3067\u89e3\u6790\u3057\u305f\u66f8\u5f0f\u3092\u30e1\u30f3\u30d0\u5909\u6570\u3067\u4fdd\u6301\u3057\u3066\u304a\u3044\u3066\u3001\n // \u305d\u308c\u3092\u3082\u3068\u306b\u66f8\u5f0f\u5316\u3059\u308b\n auto format(const MyVector<T>& v, std::format_context& fctx) const {\n if (is_colon) {\n auto out = fctx.out();\n bool is_first = true;\n for (const T& x : v) {\n if (is_first) {\n is_first = false;\n }\n else {\n *out = ':';\n ++out;\n }\n fctx.advance_to(out);\n out = this->underlying().format(x, fctx);\n }\n return out;\n }\n return base_type::format(v.base(), fctx);\n }\n};\n\n#include <cstdint>\n\nint main()\n{\n MyVector<std::uint8_t> v = {0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};\n std::cout << std::format(\"{:c:02x}\", v) << std::endl;\n}\n"}, {"id": "20275de998df0cf57c429cd8526ec1e0da27e233", "source": "#include <iostream>\n#include <format>\n#include <vector>\n\ntemplate <class T>\nstruct MyVector : std::vector<T> {\n using std::vector<T>::vector;\n};\n\ntemplate <class T>\nconstexpr std::range_format std::format_kind<MyVector<T>> = std::range_format::sequence;\n\ntemplate <class T>\nclass std::formatter<MyVector<T>> : public std::range_formatter<T> {\n using base_type = std::range_formatter<T>;\npublic:\n constexpr auto parse(std::format_parse_context& pctx) {\n auto it = pctx.begin();\n if (*it == 'c') {\n this->set_separator(\":\"); // \u533a\u5207\u308a\u6587\u5b57\u3092\u300c:\u300d\u306b\u8a2d\u5b9a\n this->set_brackets(\"\", \"\"); // \u56f2\u307f\u6587\u5b57\u3092\u7a7a\u6587\u5b57\u5217\u306b\u8a2d\u5b9a\n ++it;\n }\n pctx.advance_to(it);\n return base_type::parse(pctx);\n }\n};\n\n#include <cstdint>\n\nint main()\n{\n MyVector<std::uint8_t> v = {0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};\n std::cout << std::format(\"{:c:02x}\", v) << std::endl;\n}\n"}], "page_id": ["reference", "format", "range_formatter"]}">
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<div class="identifier-type">class template</div><div class="header"><format></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">range_formatter</span><span class="cpp cpp23" title="C++23で追加">(C++23)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="p">,</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">charT</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kt">char</span><span class="o">></span>
<span class="w"> </span><span class="k">requires</span><span class="w"> </span><span class="n"><a href="../concepts/same_as.html">same_as</a></span><span class="o"><</span><span class="n"><a href="../type_traits/remove_cvref.html">remove_cvref_t</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">,</span><span class="w"> </span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="o">&&</span><span class="w"> </span><span class="n"><a href="formattable.html">formattable</a></span><span class="o"><</span><span class="n">T</span><span class="p">,</span><span class="w"> </span><span class="n">charT</span><span class="o">></span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">range_formatter</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>range_formatter</code>は、Range・コンテナに対する<code><a href="formatter.html">formatter</a></code>クラスの特殊化を実装するためのユーティリティクラスである。</p>
<p>このクラスは、説明専用クラス<code><a href="range-default-formatter.html">range-default-formatter</a></code>の内部実装として使用される。</p>
<p><a class="cpprefjp-defined-word" data-desc="プログラム定義。ユーザー（プログラマ）によって定義されること（標準ライブラリで定義されるものを除く）">ユーザー定義</a>のコンテナ・RangeをRange書式に対応する場合は、以下のようにする：</p>
<ul>
<li>オリジナル書式を定義しないのであれば、このクラスではなく、<code><a href="format_kind.html">format_kind</a></code>を特殊化する</li>
<li>オリジナル書式を定義するのであれば、このクラスおよび<code><a href="format_kind.html">format_kind</a></code>を特殊化して<code><a href="range_formatter/parse.html">parse()</a></code>メンバ関数と<code><a href="range_formatter/format.html">format()</a></code>メンバ関数を実装する</li>
</ul>
<h2>メンバ関数</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>メンバ関数</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="range_formatter/set_separator.html">set_separator</a></code></td>
<td>要素の区切り文字を設定する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="range_formatter/set_brackets.html">set_brackets</a></code></td>
<td>全体の囲み文字を設定する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="range_formatter/underlying.html">underlying</a></code></td>
<td>要素型の<code>formatter</code>を取得する</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="range_formatter/parse.html">parse</a></code></td>
<td>書式の解析を行う</td>
<td>C++23</td>
</tr>
<tr>
<td><code><a href="range_formatter/format.html">format</a></code></td>
<td>書式化を行う</td>
<td>C++23</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<h3>オリジナル書式を定義する例</h3>
<p><div class="yata" id="ba43ff747e7dbd9df98ace5e1eb36bb66305ba5e"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../format.html"><format></a></span>
<span class="cp">#include <a href="../vector.html"><vector></a></span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="k">class</span><span class="w"> </span><span class="nc">MyVector</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">v_</span><span class="p">;</span>
<span class="k">public</span><span class="o">:</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">base_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">iterator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">base_type</span><span class="o">::</span><span class="n">iterator</span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">const_iterator</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">base_type</span><span class="o">::</span><span class="n">const_iterator</span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">value_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">base_type</span><span class="o">::</span><span class="n">value_type</span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">reference</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">base_type</span><span class="o">::</span><span class="n">reference</span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">const_reference</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">typename</span><span class="w"> </span><span class="nc">base_type</span><span class="o">::</span><span class="n">const_reference</span><span class="p">;</span>
<span class="w"> </span><span class="n">MyVector</span><span class="p">()</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">default</span><span class="p">;</span>
<span class="w"> </span><span class="n">MyVector</span><span class="p">(</span><span class="n"><a href="../initializer_list/initializer_list.html">std::initializer_list</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">init</span><span class="p">)</span>
<span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">v_</span><span class="p">(</span><span class="n">init</span><span class="p">.</span><span class="n">begin</span><span class="p">(),</span><span class="w"> </span><span class="n">init</span><span class="p">.</span><span class="n">end</span><span class="p">())</span><span class="w"> </span><span class="p">{}</span>
<span class="w"> </span><span class="n">iterator</span><span class="w"> </span><span class="n">begin</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">v_</span><span class="p">.</span><span class="n">begin</span><span class="p">();</span><span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n">const_iterator</span><span class="w"> </span><span class="n">begin</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">v_</span><span class="p">.</span><span class="n">begin</span><span class="p">();</span><span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n">iterator</span><span class="w"> </span><span class="n">end</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">v_</span><span class="p">.</span><span class="n">end</span><span class="p">();</span><span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n">const_iterator</span><span class="w"> </span><span class="n">end</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">v_</span><span class="p">.</span><span class="n">end</span><span class="p">();</span><span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="n">T</span><span class="o">>&</span><span class="w"> </span><span class="n">base</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">v_</span><span class="p">;</span><span class="w"> </span><span class="p">}</span>
<span class="p">};</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="k">constexpr</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">range_format</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">format_kind</span><span class="o"><</span><span class="n">MyVector</span><span class="o"><</span><span class="n">T</span><span class="o">>></span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">range_format</span><span class="o">::</span><span class="n">sequence</span><span class="p">;</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="k">class</span><span class="w"> </span><span class="nc">std</span><span class="o">::</span><span class="n">formatter</span><span class="o"><</span><span class="n">MyVector</span><span class="o"><</span><span class="n">T</span><span class="o">>></span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">range_formatter</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">is_colon</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">base_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">range_formatter</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">;</span>
<span class="k">public</span><span class="o">:</span>
<span class="w"> </span><span class="c1">// コンパイル時の書式文字列の解析があるため、</span>
<span class="w"> </span><span class="c1">// constexprにする必要がある。</span>
<span class="w"> </span><span class="c1">// この関数に渡されるパラメータは、{:c:02x}のc以降。</span>
<span class="w"> </span><span class="c1">// 解析がおわった場所を指すイテレータを返す。</span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">parse</span><span class="p">(</span><span class="n"><a href="basic_format_parse_context.html">std::format_parse_context</a></span><span class="o">&</span><span class="w"> </span><span class="n">pctx</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">it</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="basic_format_parse_context/begin.html">pctx.begin()</a></span><span class="p">;</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">*</span><span class="n">it</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="sc">'c'</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">is_colon</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
<span class="w"> </span><span class="o">++</span><span class="n">it</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="basic_format_parse_context/advance_to.html">pctx.advance_to</a></span><span class="p">(</span><span class="n">it</span><span class="p">);</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">base_type</span><span class="o">::</span><span class="n">parse</span><span class="p">(</span><span class="n">pctx</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">// format()関数は書式の情報をもたない。</span>
<span class="w"> </span><span class="c1">// parse()関数で解析した書式をメンバ変数で保持しておいて、</span>
<span class="w"> </span><span class="c1">// それをもとに書式化する</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">format</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">MyVector</span><span class="o"><</span><span class="n">T</span><span class="o">>&</span><span class="w"> </span><span class="n">v</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="basic_format_context.html">std::format_context</a></span><span class="o">&</span><span class="w"> </span><span class="n">fctx</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">is_colon</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">out</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="basic_format_context/out.html">fctx.out()</a></span><span class="p">;</span>
<span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">is_first</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">v</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">is_first</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">is_first</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="o">*</span><span class="n">out</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="sc">':'</span><span class="p">;</span>
<span class="w"> </span><span class="o">++</span><span class="n">out</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="basic_format_context/advance_to.html">fctx.advance_to</a></span><span class="p">(</span><span class="n">out</span><span class="p">);</span>
<span class="w"> </span><span class="n">out</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">this</span><span class="o">-></span><span class="n"><a href="range_formatter/underlying.html">underlying()</a></span><span class="p">.</span><span class="n">format</span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">fctx</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">out</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">base_type</span><span class="o">::</span><span class="n">format</span><span class="p">(</span><span class="n">v</span><span class="p">.</span><span class="n">base</span><span class="p">(),</span><span class="w"> </span><span class="n">fctx</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">};</span>
<span class="cp">#include <a href="../cstdint.html"><cstdint></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="n">MyVector</span><span class="o"><</span><span class="n"><a href="../cstdint/uint8_t.html">std::uint8_t</a></span><span class="o">></span><span class="w"> </span><span class="n">v</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mh">0xaa</span><span class="p">,</span><span class="w"> </span><span class="mh">0xbb</span><span class="p">,</span><span class="w"> </span><span class="mh">0xcc</span><span class="p">,</span><span class="w"> </span><span class="mh">0xdd</span><span class="p">,</span><span class="w"> </span><span class="mh">0xee</span><span class="p">,</span><span class="w"> </span><span class="mh">0xff</span><span class="p">};</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="format.html">std::format</a></span><span class="p">(</span><span class="s">"{:c:02x}"</span><span class="p">,</span><span class="w"> </span><span class="n">v</span><span class="p">)</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>aa:bb:cc:dd:ee:ff
</code></pre></p>
<h3>オリジナル書式を定義する例（<code>set_separator</code>と<code>set_brackets</code>を使う場合）</h3>
<p><div class="yata" id="20275de998df0cf57c429cd8526ec1e0da27e233"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../format.html"><format></a></span>
<span class="cp">#include <a href="../vector.html"><vector></a></span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="k">struct</span><span class="w"> </span><span class="nc">MyVector</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n"><a href="../vector/vector.html">std::vector</a></span><span class="o"><</span><span class="n">T</span><span class="o">>::</span><span class="n">vector</span><span class="p">;</span>
<span class="p">};</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="k">constexpr</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">range_format</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">format_kind</span><span class="o"><</span><span class="n">MyVector</span><span class="o"><</span><span class="n">T</span><span class="o">>></span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">range_format</span><span class="o">::</span><span class="n">sequence</span><span class="p">;</span>
<span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">T</span><span class="o">></span>
<span class="k">class</span><span class="w"> </span><span class="nc">std</span><span class="o">::</span><span class="n">formatter</span><span class="o"><</span><span class="n">MyVector</span><span class="o"><</span><span class="n">T</span><span class="o">>></span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">range_formatter</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">base_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">range_formatter</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">;</span>
<span class="k">public</span><span class="o">:</span>
<span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">parse</span><span class="p">(</span><span class="n"><a href="basic_format_parse_context.html">std::format_parse_context</a></span><span class="o">&</span><span class="w"> </span><span class="n">pctx</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">it</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="basic_format_parse_context/begin.html">pctx.begin()</a></span><span class="p">;</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="o">*</span><span class="n">it</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="sc">'c'</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">this</span><span class="o">-></span><span class="n">set_separator</span><span class="p">(</span><span class="s">":"</span><span class="p">);</span><span class="w"> </span><span class="c1">// 区切り文字を「:」に設定</span>
<span class="w"> </span><span class="k">this</span><span class="o">-></span><span class="n">set_brackets</span><span class="p">(</span><span class="s">""</span><span class="p">,</span><span class="w"> </span><span class="s">""</span><span class="p">);</span><span class="w"> </span><span class="c1">// 囲み文字を空文字列に設定</span>
<span class="w"> </span><span class="o">++</span><span class="n">it</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n"><a href="basic_format_parse_context/advance_to.html">pctx.advance_to</a></span><span class="p">(</span><span class="n">it</span><span class="p">);</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">base_type</span><span class="o">::</span><span class="n">parse</span><span class="p">(</span><span class="n">pctx</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">};</span>
<span class="cp">#include <a href="../cstdint.html"><cstdint></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="n">MyVector</span><span class="o"><</span><span class="n"><a href="../cstdint/uint8_t.html">std::uint8_t</a></span><span class="o">></span><span class="w"> </span><span class="n">v</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="mh">0xaa</span><span class="p">,</span><span class="w"> </span><span class="mh">0xbb</span><span class="p">,</span><span class="w"> </span><span class="mh">0xcc</span><span class="p">,</span><span class="w"> </span><span class="mh">0xdd</span><span class="p">,</span><span class="w"> </span><span class="mh">0xee</span><span class="p">,</span><span class="w"> </span><span class="mh">0xff</span><span class="p">};</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="format.html">std::format</a></span><span class="p">(</span><span class="s">"{:c:02x}"</span><span class="p">,</span><span class="w"> </span><span class="n">v</span><span class="p">)</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h4>出力</h4>
<p><pre><code>aa:bb:cc:dd:ee:ff
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++23</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
<li><a href="../../implementation.html#gcc">GCC</a>: 15.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#icc">ICC</a>: ??</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
</ul>
<h2>関連項目</h2>
<ul>
<li><code><a href="range-default-formatter.html">range-default-formatter</a></code></li>
<li><code><a href="formatter.html">formatter</a></code></li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2286r8.html" target="_blank">P2286R8 Formatting Ranges</a></li>
<li><a href="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2585r1.html" target="_blank">P2585R1 Improve default container formatting</a><ul>
<li>C++23から、Range・コンテナ、<code>pair</code>、<code>tuple</code>のフォーマット出力、および文字・文字列のデバッグ指定 (<code>"?"</code>) が追加された</li>
</ul>
</li>
</ul></div>
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