2019-03-31 11:00:21 +00:00
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---
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title: クラスのインスタンスを作成するとき (@shibuyalisp Hackathon)
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author: kazu634
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date: 2010-10-24
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wordtwit_post_info:
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- 'O:8:"stdClass":13:{s:6:"manual";b:0;s:11:"tweet_times";i:1;s:5:"delay";i:0;s:7:"enabled";i:1;s:10:"separation";s:2:"60";s:7:"version";s:3:"3.7";s:14:"tweet_template";b:0;s:6:"status";i:2;s:6:"result";a:0:{}s:13:"tweet_counter";i:2;s:13:"tweet_log_ids";a:1:{i:0;i:5369;}s:9:"hash_tags";a:0:{}s:8:"accounts";a:1:{i:0;s:7:"kazu634";}}'
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categories:
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- gauche
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---
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<div class="section">
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<p>
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値が束縛されているときだけ、スロットに束縛するにはどうすればいいのかな？やりたいことはこういうことなんだけど、「malformed if」と怒られた:
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</p>
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<pre class="syntax-highlight">
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<span class="synSpecial">(</span>define-class <photo-data> <span class="synSpecial">()</span>
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<span class="synSpecial">((</span>width :init-keyword :width :init-value <span class="synConstant"></span><span class="synSpecial">)</span>
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<span class="synSpecial">(</span>url-with-slug :init-keyword :url-with-slug :init-value <span class="synConstant">""</span><span class="synSpecial">)))</span>
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<span class="synSpecial">(</span>define <span class="synSpecial">(</span>make-photo-data-list sxml<span class="synSpecial">)</span>
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<span class="synSpecial">(</span>make <photo-data>
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<span class="synComment">;; 与えられたSXMLにwidth要素が存在するとき、スロットに値をセットしたい</span>
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<span class="synComment">;; でも、これだとエラーになる</span>
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<span class="synSpecial">(</span><span class="synStatement">if</span> <span class="synSpecial">((</span>if-car-sxpath <span class="synSpecial">'(</span><span class="synStatement">//</span> width<span class="synSpecial">))</span> sxml<span class="synSpecial">)</span>
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:width <span class="synSpecial">(</span><span class="synStatement">cadr</span> <span class="synSpecial">((</span>car-sxpath <span class="synSpecial">'(</span><span class="synStatement">//</span> width<span class="synSpecial">))</span> sxml<span class="synSpecial">))</span>
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:width <span class="synConstant"></span><span class="synSpecial">)</span>
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:url-with-slug <span class="synSpecial">(</span><span class="synStatement">cadr</span> <span class="synSpecial">((</span>car-sxpath <span class="synSpecial">'(</span><span class="synStatement">//</span> url-with-slug<span class="synSpecial">))</span>
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sxml<span class="synSpecial">))))</span>
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</pre>
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2019-04-02 16:06:15 +00:00
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</div>
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