Cryolite https://blog.hatena.ne.jp/Cryolite/ Cry's Blog https://blog.cryolite.net/ C++ template< class T > T f( T &x ) { return true ? x : f( x ); }上記のコード片中の3項演算子の計算結果は右辺値だが，依然としてオブジェクト x を指し続けている（つまりコピーが行われない）． 5.16 Conditional operator 3 Otherwise, if the second and third operand have different types, and either has (possibly cv-qualified) class type, an attempt is made to convert e… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog.cryolite.net%2Fentry%2F20061102%2Fp2" title="コピーを伴わずに左辺値-&gt;右辺値変換を行う - Cry&#39;s Blog" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2006-11-02 00:00:01 rich https://blog.cryolite.net/entry/20061102/p2 1.0 100%