{"categories":["C++"],"blog_url":"https://faithandbrave.hateblo.jp/","blog_title":"Faith and Brave - C++\u3067\u904a\u307c\u3046","image_url":null,"width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ffaithandbrave.hateblo.jp%2Fentry%2F20100127%2F1264583867\" title=\" boost::optional\u3060\u3051\u3058\u3083\u306a\u304fboost::either\u304c\u307b\u3057\u3044 - Faith and Brave - C++\u3067\u904a\u307c\u3046\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2010-01-27 18:17:47","url":"https://faithandbrave.hateblo.jp/entry/20100127/1264583867","height":"190","provider_url":"https://hatena.blog","version":"1.0","author_url":"https://blog.hatena.ne.jp/faith_and_brave/","title":" boost::optional\u3060\u3051\u3058\u3083\u306a\u304fboost::either\u304c\u307b\u3057\u3044","description":"boost::optional\u306f\u6210\u529f\u304b\u5931\u6557\u304b\u3057\u304b\u308f\u304b\u3089\u306a\u3044\u306e\u3067 \u5931\u6557\u3057\u305f\u7406\u7531\u4ed8\u304d\u306eoptional\u304c\u307b\u3057\u3044\u3088\u306d\u3001\u3068\u3044\u3046\u8a71\u304cTwitter\u3067\u3042\u308a\u307e\u3057\u305f\u3002 Maybe\u30e2\u30ca\u30c9(boost::optional)\u306b\u5bfe\u3059\u308bEither\u30e2\u30ca\u30c9\u306e\u3088\u3046\u306b boost::either\u3068\u3044\u3046\u540d\u524d\u3060\u3068\u4eee\u5b9a\u3057\u3066\u3001\u3053\u3093\u306a\u611f\u3058\u3067\u4f7f\u3048\u308b\u3068\u3044\u3044\u3093\u3058\u3083\u306a\u3044\u304b\u306a\u3001\u3068\u3002 either<int> foo(int a) { typedef either<int> result_type; return a >= 0 ? a : result_type(\"invalid argument\", result_type::error_tag(\u2026","type":"rich","provider_name":"Hatena Blog","author_name":"faith_and_brave"}