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<header data-kunai-mdinfo="{"meta": {"header": ["filesystem"], "namespace": ["std::filesystem"], "id-type": ["function"], "cpp": ["cpp17"]}, "sources": [{"id": "a734007709283255c98e0043eb4302d0bdb03957", "source": "#include <cassert>\n#include <filesystem>\n#include <fstream>\n\nnamespace fs = std::filesystem;\n\nint main()\n{\n // \u5358\u7d14\u306a\u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30d4\u30fc\u3002\n // \u30b3\u30d4\u30fc\u5148\u306b\u306f\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3057\u3066\u3044\u306a\u3044\n // (\u30b3\u30d4\u30fc\u5148\u306b\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3057\u3066\u3044\u305f\u3089\u30a8\u30e9\u30fc)\n {\n std::ofstream{\"regular1.txt\"};\n\n // \u30d5\u30a1\u30a4\u30eb\"regular1.txt\"\u3092\u3001\"copy1.txt\"\u306b\u30b3\u30d4\u30fc\u3059\u308b\n fs::copy(\"regular1.txt\", \"copy1.txt\");\n\n assert(fs::exists(\"regular1.txt\"));\n assert(fs::exists(\"copy1.txt\"));\n }\n\n // \u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30d4\u30fc\u3002\n // \u30b3\u30d4\u30fc\u5148\u306b\u3059\u3067\u306b\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u4e0a\u66f8\u304d\u3059\u308b\n {\n std::ofstream{\"regular2.txt\"};\n\n // \u30d5\u30a1\u30a4\u30eb\"regular2.txt\"\u3092\u3001\"copy2.txt\"\u306b\u30b3\u30d4\u30fc\u3059\u308b\n fs::copy(\"regular2.txt\", \"copy2.txt\", fs::copy_options::overwrite_existing);\n\n assert(fs::exists(\"regular2.txt\"));\n assert(fs::exists(\"copy2.txt\"));\n }\n\n // \u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30d4\u30fc\u3092\u3001\u30b7\u30f3\u30dc\u30ea\u30c3\u30af\u30ea\u30f3\u30af\u306e\u4f5c\u6210\u3068\u3057\u3066\u884c\u3046\n {\n std::ofstream{\"regular3.txt\"};\n\n // \u30d5\u30a1\u30a4\u30eb\"regular3.txt\"\u3078\u306e\u30b7\u30f3\u30dc\u30ea\u30c3\u30af\u30ea\u30f3\u30af\u3068\u3057\u3066\u3001\"copy3.txt\"\u3092\u4f5c\u6210\u3059\u308b\n fs::copy(\"regular3.txt\", \"copy3.txt\", fs::copy_options::create_symlinks);\n\n assert(fs::exists(\"regular3.txt\"));\n assert(fs::exists(\"copy3.txt\"));\n assert(fs::is_symlink(\"copy3.txt\"));\n }\n\n // \u30b7\u30f3\u30dc\u30ea\u30c3\u30af\u30ea\u30f3\u30af\u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30d4\u30fc\n {\n fs::create_symlink(\"regular3.txt\", \"regular4.symlink\");\n\n // \u30b7\u30f3\u30dc\u30ea\u30c3\u30af\u30ea\u30f3\u30af\u30d5\u30a1\u30a4\u30eb\"regular4.symlink\"\u3092\u3001\"copy4.symlink\"\u306b\u30b3\u30d4\u30fc\u3059\u308b\n fs::copy(\"regular4.symlink\", \"copy4.symlink\");\n\n assert(fs::exists(\"regular4.symlink\"));\n assert(fs::exists(\"copy4.symlink\"));\n }\n\n // \u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u30b3\u30d4\u30fc\n {\n fs::create_directory(\"dir\");\n fs::create_directory(\"dir/sub_dir\");\n std::ofstream{\"dir/a.txt\"};\n std::ofstream{\"dir/sub_dir/b.txt\"};\n\n fs::copy(\"dir\", \"copy_dir\", fs::copy_options::recursive);\n\n assert(fs::exists(\"copy_dir\"));\n assert(fs::exists(\"copy_dir/sub_dir\"));\n assert(fs::exists(\"copy_dir/a.txt\"));\n assert(fs::exists(\"copy_dir/sub_dir/b.txt\"));\n }\n}\n"}], "page_id": ["reference", "filesystem", "copy"]}">
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最終更新日時:
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2024年06月11日 22時45分38秒 (JST)
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<div class="identifier-type">function</div><div class="header"><filesystem></div><h1 itemprop="name"><span class="namespace" title="namespace std::filesystem">std::filesystem::</span><span class="token">copy</span><span class="cpp cpp17" title="C++17で追加">(C++17)</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="o">::</span><span class="nn">filesystem</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">copy</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n"><a href="path.html">path</a></span><span class="o">&</span><span class="w"> </span><span class="n">from</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="path.html">path</a></span><span class="o">&</span><span class="w"> </span><span class="n">to</span><span class="p">);</span><span class="w"> </span><span class="c1">// (1)</span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">copy</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n"><a href="path.html">path</a></span><span class="o">&</span><span class="w"> </span><span class="n">from</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="path.html">path</a></span><span class="o">&</span><span class="w"> </span><span class="n">to</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../system_error/error_code.html">std::error_code</a></span><span class="o">&</span><span class="w"> </span><span class="n">ec</span><span class="p">);</span><span class="w"> </span><span class="c1">// (2)</span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">copy</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n"><a href="path.html">path</a></span><span class="o">&</span><span class="w"> </span><span class="n">from</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="path.html">path</a></span><span class="o">&</span><span class="w"> </span><span class="n">to</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="copy_options.html">copy_options</a></span><span class="w"> </span><span class="n">options</span><span class="p">);</span><span class="w"> </span><span class="c1">// (3)</span>
<span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">copy</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n"><a href="path.html">path</a></span><span class="o">&</span><span class="w"> </span><span class="n">from</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n"><a href="path.html">path</a></span><span class="o">&</span><span class="w"> </span><span class="n">to</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="copy_options.html">copy_options</a></span><span class="w"> </span><span class="n">options</span><span class="p">,</span>
<span class="w"> </span><span class="n"><a href="../system_error/error_code.html">std::error_code</a></span><span class="o">&</span><span class="w"> </span><span class="n">ec</span><span class="p">);</span><span class="w"> </span><span class="c1">// (4)</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p>ファイル・ディレクトリ・シンボリックリンクをコピーする。</p>
<h2>要件</h2>
<ul>
<li><code>options</code>は、各グループのオプションが最大ひとつまで設定されていること</li>
</ul>
<h2>効果</h2>
<ul>
<li>(1) : <code>return copy(from, to, <a href="copy_options.html">copy_options::none</a>);</code></li>
<li>(2) : <code>return copy(from, to, <a href="copy_options.html">copy_options::none</a>, ec);</code></li>
<li>
<p>(3), (4) :</p>
<ul>
<li>
<p>まず、コピー元のファイル状態<code>f</code>とコピー先のファイル状態<code>t</code>を、以下のように取得する：
<br />
<div class="codehilite"><pre><span></span><code><span class="n"><a href="file_status.html">file_status</a></span><span class="w"> </span><span class="n">f</span><span class="p">;</span>
<span class="n"><a href="file_status.html">file_status</a></span><span class="w"> </span><span class="n">t</span><span class="p">;</span>
<span class="k">if</span><span class="w"> </span><span class="p">((</span><span class="n">options</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="n"><a href="copy_options.html">copy_options</a></span><span class="o">::</span><span class="n">create_symlinks</span><span class="p">)</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n"><a href="copy_options.html">copy_options</a></span><span class="o">::</span><span class="n">none</span><span class="w"> </span><span class="o">||</span>
<span class="w"> </span><span class="p">(</span><span class="n">options</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="n"><a href="copy_options.html">copy_options</a></span><span class="o">::</span><span class="n">skip_symlinks</span><span class="p">)</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n"><a href="copy_options.html">copy_options</a></span><span class="o">::</span><span class="n">none</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="symlink_status.html">symlink_status</a></span><span class="p">(</span><span class="n">from</span><span class="p">);</span>
<span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="symlink_status.html">symlink_status</a></span><span class="p">(</span><span class="n">to</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">else</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">((</span><span class="n">options</span><span class="w"> </span><span class="o">&</span><span class="w"> </span><span class="n"><a href="copy_options.html">copy_options</a></span><span class="o">::</span><span class="n">copy_symlinks</span><span class="p">)</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n"><a href="copy_options.html">copy_options</a></span><span class="o">::</span><span class="n">none</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="symlink_status.html">symlink_status</a></span><span class="p">(</span><span class="n">from</span><span class="p">);</span>
<span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="status.html">status</a></span><span class="p">(</span><span class="n">to</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">else</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">f</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="status.html">status</a></span><span class="p">(</span><span class="n">from</span><span class="p">);</span>
<span class="w"> </span><span class="n">t</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="status.html">status</a></span><span class="p">(</span><span class="n">to</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
</p>
</li>
<li>
<p><code>f.<a href="file_status/type.html">type()</a></code>もしくは<code>t.<a href="file_status/type.html">type()</a></code>が<a class="cpprefjp-defined-word" data-desc="処理系定義の動作。処理系によって事前に定めた動作をする" href="../../implementation-compliance.html#dfn-implementation-defined-behavior">実装定義</a>のファイル種別であった場合、その効果は<a class="cpprefjp-defined-word" data-desc="処理系定義の動作。処理系によって事前に定めた動作をする" href="../../implementation-compliance.html#dfn-implementation-defined-behavior">実装定義</a>となる</p>
</li>
<li>以下のいずれかの場合、エラーを報告する。(3)の場合は<a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>、(4)の場合は<code>ec</code>にエラー情報を設定することでエラー報告とする：<ul>
<li><code>!<a href="exists.html">exists</a>(f)</code></li>
<li><code><a href="equivalent.html">equivalent</a>(from, to)</code></li>
<li><code><a href="is_other.html">is_other</a>(f) || <a href="is_other.html">is_other</a>(t)</code></li>
<li><code><a href="is_directory.html">is_directory</a>(f) && <a href="is_regular_file.html">is_regular_file</a>(t)</code></li>
<li>また、それ以外に、ファイルコピー、シンボリックリンクのコピー、ディレクトリ作成などにおいてエラーが報告される可能性がある</li>
</ul>
</li>
<li>コピー元がシンボリックリンクである場合、<ul>
<li><code>(options & copy_options::skip_symlinks) != copy_options::none</code>であれば、なにもしないで終了する</li>
<li><code>!exists(t) && (options & copy_options::copy_symlinks) != copy_options::none</code>であれば、<code><a href="copy_symlink.html">copy_symlink</a>(from, to)</code>を実行する</li>
<li>いずれの条件にも合致しない場合は、エラーを報告する</li>
</ul>
</li>
<li>コピー元が通常ファイルである場合、<ul>
<li><code>(options & copy_options::directories_only) != copy_options::none</code>であれば、なにもしないで終了する</li>
<li><code>(options & copy_options::create_symlinks) != copy_options::none</code>であれば、コピー元ファイルのシンボリックリンクを、コピー先に作成する</li>
<li><code>(options & copy_options::create_hard_links) != copy_options::none</code>であれば、コピー元ファイルのハードリンクを、コピー先に作成する</li>
<li>コピー先がディレクトリである場合、<code><a href="copy_file.html">copy_file</a>(from, to/<a href="path/filename.html">from.filename()</a>, options)</code>を実行する</li>
<li>いずれの条件にも合致しない場合は、<code><a href="copy_file.html">copy_file</a>(from, to, options)</code>を実行する</li>
</ul>
</li>
<li>コピー元がディレクトリであり、<code>(options & copy_options::create_symlinks) != copy_options::none</code>である場合、<code><a href="../system_error/make_error_code.html">make_error_code</a>(<a href="../system_error/errc.html">errc::is_a_directory</a>)</code>と等値な<code><a href="../system_error/error_code.html">error_code</a></code>オブジェクトをエラーとして報告する</li>
<li>
<p>コピー元がディレクトリであり、<code>((options & copy_options::recursive) != copy_options::none || options == copy_options::none)</code>である場合、</p>
<ul>
<li>コピー先にディレクトリが存在しない場合は、<code><a href="create_directory.html">create_directory</a>(to, from)</code>を実行する</li>
<li>その後、コピー元ディレクトリの全ての要素を、以下のようにコピーする (<code>in-recursive-copy</code>は、<code><a href="copy_options.html">copy_options</a></code>には含まれないビットマスク要素)：</li>
</ul>
<p><div class="codehilite"><pre><span></span><code><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"><a href="directory_entry.html">directory_entry</a></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"><a href="directory_iterator.html">directory_iterator</a></span><span class="p">(</span><span class="n">from</span><span class="p">))</span>
<span class="w"> </span><span class="n">copy</span><span class="p">(</span><span class="n"><a href="directory_entry/path.html">x.path()</a></span><span class="p">,</span><span class="w"> </span><span class="n">to</span><span class="o">/</span><span class="n"><a href="directory_entry/path.html">x.path()</a></span><span class="p">.</span><span class="n"><a href="path/filename.html">filename()</a></span><span class="p">,</span><span class="w"> </span><span class="n">options</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n"><a href="copy_options.html">copy_options</a></span><span class="o">::</span><span class="n"><i>in-recursive-copy</i></span><span class="p">)</span>
</code></pre></div>
</p>
</li>
<li>
<p>いずれでもない場合、</p>
<ul>
<li>(3) であれば、なにもしない</li>
<li>(4) であれば<code><a href="../system_error/error_code/clear.html">ec.clear()</a></code>を呼び出し、エラー情報をクリアする</li>
</ul>
</li>
</ul>
</li>
</ul>
<h2><a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a></h2>
<ul>
<li>(1), (3) : ファイルシステムがエラーを報告する場合がある。エラーが発生した場合は、<code><a href="filesystem_error.html">std::filesystem::filesystem_error</a></code><a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>を送出する</li>
<li>(2), (4) : OSがファイルコピーの直接のAPIを定義していない場合、この関数の実装として動的なバッファを確保する可能性がある。その際、メモリ確保で<a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>が発生する可能性がある</li>
</ul>
<h2>例</h2>
<p><div class="yata" id="a734007709283255c98e0043eb4302d0bdb03957"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../cassert.html"><cassert></a></span>
<span class="cp">#include <a href="../filesystem.html"><filesystem></a></span>
<span class="cp">#include <a href="../fstream.html"><fstream></a></span>
<span class="k">namespace</span><span class="w"> </span><span class="nn">fs</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nn">std</span><span class="o">::</span><span class="nn">filesystem</span><span class="p">;</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="c1">// 単純なファイルのコピー。</span>
<span class="w"> </span><span class="c1">// コピー先にはファイルが存在していない</span>
<span class="w"> </span><span class="c1">// (コピー先にファイルが存在していたらエラー)</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">ofstream</span><span class="p">{</span><span class="s">"regular1.txt"</span><span class="p">};</span>
<span class="w"> </span><span class="c1">// ファイル"regular1.txt"を、"copy1.txt"にコピーする</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">fs::copy</span></span><span class="p">(</span><span class="s">"regular1.txt"</span><span class="p">,</span><span class="w"> </span><span class="s">"copy1.txt"</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"regular1.txt"</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"copy1.txt"</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">// ファイルのコピー。</span>
<span class="w"> </span><span class="c1">// コピー先にすでにファイルがある場合は、上書きする</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">ofstream</span><span class="p">{</span><span class="s">"regular2.txt"</span><span class="p">};</span>
<span class="w"> </span><span class="c1">// ファイル"regular2.txt"を、"copy2.txt"にコピーする</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">fs::copy</span></span><span class="p">(</span><span class="s">"regular2.txt"</span><span class="p">,</span><span class="w"> </span><span class="s">"copy2.txt"</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="copy_options.html">fs::copy_options</a></span><span class="o">::</span><span class="n">overwrite_existing</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"regular2.txt"</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"copy2.txt"</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">// ファイルのコピーを、シンボリックリンクの作成として行う</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">ofstream</span><span class="p">{</span><span class="s">"regular3.txt"</span><span class="p">};</span>
<span class="w"> </span><span class="c1">// ファイル"regular3.txt"へのシンボリックリンクとして、"copy3.txt"を作成する</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">fs::copy</span></span><span class="p">(</span><span class="s">"regular3.txt"</span><span class="p">,</span><span class="w"> </span><span class="s">"copy3.txt"</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="copy_options.html">fs::copy_options</a></span><span class="o">::</span><span class="n">create_symlinks</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"regular3.txt"</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"copy3.txt"</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="is_symlink.html">fs::is_symlink</a></span><span class="p">(</span><span class="s">"copy3.txt"</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">// シンボリックリンクファイルのコピー</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="create_symlink.html">fs::create_symlink</a></span><span class="p">(</span><span class="s">"regular3.txt"</span><span class="p">,</span><span class="w"> </span><span class="s">"regular4.symlink"</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// シンボリックリンクファイル"regular4.symlink"を、"copy4.symlink"にコピーする</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">fs::copy</span></span><span class="p">(</span><span class="s">"regular4.symlink"</span><span class="p">,</span><span class="w"> </span><span class="s">"copy4.symlink"</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"regular4.symlink"</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"copy4.symlink"</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">// ディレクトリのコピー</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="create_directory.html">fs::create_directory</a></span><span class="p">(</span><span class="s">"dir"</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="create_directory.html">fs::create_directory</a></span><span class="p">(</span><span class="s">"dir/sub_dir"</span><span class="p">);</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">ofstream</span><span class="p">{</span><span class="s">"dir/a.txt"</span><span class="p">};</span>
<span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">ofstream</span><span class="p">{</span><span class="s">"dir/sub_dir/b.txt"</span><span class="p">};</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">fs::copy</span></span><span class="p">(</span><span class="s">"dir"</span><span class="p">,</span><span class="w"> </span><span class="s">"copy_dir"</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="copy_options.html">fs::copy_options</a></span><span class="o">::</span><span class="n">recursive</span><span class="p">);</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"copy_dir"</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"copy_dir/sub_dir"</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"copy_dir/a.txt"</span><span class="p">));</span>
<span class="w"> </span><span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><a href="exists.html">fs::exists</a></span><span class="p">(</span><span class="s">"copy_dir/sub_dir/b.txt"</span><span class="p">));</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code></code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++17</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 7.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 8.1 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>:</li>
</ul>
<h2>参照</h2>
<ul>
<li><a href="https://wg21.cmeerw.net/lwg/issue3015" target="_blank">LWG Issue 3015. <code>copy_options::unspecified</code> underspecified</a></li>
<li><a href="https://wg21.cmeerw.net/lwg/issue2682" target="_blank">LWG Issue 2682. <code>filesystem::copy()</code> won't create a symlink to a directory</a><ul>
<li>C++17策定同時の仕様では、<code>copy("/", "root", copy_options::create_symlinks);</code>のような状況 (コピー元がディレクトリで、<code>create_symlinks</code>オプション付き) でコピー先ディレクトリにシンボリックリンクが作られない問題があった。GNUの<code>cp -s</code>コマンドでは「ディレクトリ<code>"/"</code>の処理は省略された」と表示されてエラー終了する。この問題に対する仕様変更ではその動作に合わせて、コピー元がディレクトリで<code>create_symlinks</code>オプションが指定された場合、エラーを報告するようになった</li>
<li>この問題は2016年4月に報告された。仕様としてはC++20に含まれるが、過去に遡ってC++17のコンパイラでもこの仕様に対応している可能性がある</li>
</ul>
</li>
<li><a href="https://wg21.cmeerw.net/lwg/issue3013" target="_blank">LWG Issue 3013. <code>(recursive_)directory_iterator</code> construction and traversal should not be <code>noexcept</code></a></li>
</ul></div>
</div>
</div>
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