{"id":134840,"date":"2024-03-26T09:22:15","date_gmt":"2024-03-26T00:22:15","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/%e5%8b%95%e7%9a%84%e3%82%ad%e3%83%a3%e3%82%b9%e3%83%88\/"},"modified":"2024-04-06T00:43:20","modified_gmt":"2024-04-05T15:43:20","slug":"%e5%8b%95%e7%9a%84%e3%82%ad%e3%83%a3%e3%82%b9%e3%83%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e5%8b%95%e7%9a%84%e3%82%ad%e3%83%a3%e3%82%b9%e3%83%88\/","title":{"rendered":"\u52d5\u7684\u30ad\u30e3\u30b9\u30c8"},"content":{"rendered":"

\u5b9f\u884c\u6642\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u578b\u30c1\u30a7\u30c3\u30af\u3068\u5909\u63db\u3092\u884c\u3046\u3001C++ \u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u3067\u3001\u591a\u614b\u6027\u306e\u3042\u308b\u30af\u30e9\u30b9\u968e\u5c64\u306b\u5bfe\u3057\u3066\u3001\u6d3e\u751f\u30af\u30e9\u30b9\u306e\u30dd\u30a4\u30f3\u30bf\u30fc\u304b\u53c2\u7167\u3092\u3001\u57fa\u5e95\u30af\u30e9\u30b9\u306e\u30dd\u30a4\u30f3\u30bf\u30fc\u304b\u53c2\u7167\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u7528\u3044\u3089\u308c\u307e\u3059\u3002<\/p>\n

\u52d5\u7684\u5f37\u5236\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n

\u52d5\u7684\u30ad\u30e3\u30b9\u30c8<\u65b0\u3057\u3044\u578b>(\u5f0f)<\/p>\n

new_type\u304c\u5909\u63db\u5f8c\u306e\u578b\u3067\u3001expression\u304c\u5909\u63db\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30dd\u30a4\u30f3\u30bf\u3084\u53c2\u7167\u3067\u3059\u3002<\/p>\n

\u52d5\u7684\u5f37\u5236\u9069\u7528\u306b\u306f\u4e0b\u8a18\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

    \n
  1. \u30af\u30e9\u30b9\u968e\u5c64\u306b\u304a\u3044\u3066\u3001\u89aa\u30af\u30e9\u30b9\u306b\u306f\u5c11\u306a\u304f\u3068\u3082\u4e00\u3064\u306f\u4eee\u60f3\u95a2\u6570\u304c\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/li>\n
  2. \u5909\u63db\u5bfe\u8c61\u306f\u6709\u52b9\u306a\u30dd\u30a4\u30f3\u30bf\u307e\u305f\u306f\u53c2\u7167\u3067\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002<\/li>\n
  3. \u5909\u63db\u5148\u306e\u578b\u306f\u6709\u52b9\u306a\u30dd\u30a4\u30f3\u30bf\u307e\u305f\u306f\u53c2\u7167\u578b\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/li>\n
  4. \u5909\u63db\u5bfe\u8c61\u306e\u5b9f\u969b\u306e\u578b\u306f\u3001\u5909\u63db\u5148\u306e\u578b\u3068\u4e92\u63db\u6027\u304c\u3042\u308b\u3001\u3064\u307e\u308a\u3001\u5909\u63db\u5bfe\u8c61\u306e\u578b\u306f\u3001\u5909\u63db\u5148\u306e\u578b\u304b\u3001\u5909\u63db\u5148\u306e\u578b\u306e\u6d3e\u751f\u578b\u3067\u306a\u304f\u3066\u306f\u306a\u3089\u306a\u3044\u3002<\/li>\n<\/ol>\n

    \u5909\u63db\u304c\u6210\u529f\u3057\u305f\u5834\u5408\u3001dynamic_cast \u306f\u5909\u63db\u5f8c\u306e\u30dd\u30a4\u30f3\u30bf\u307e\u305f\u306f\u53c2\u7167\u3092\u8fd4\u3057\u307e\u3059\u3002\u5909\u63db\u304c\u5931\u6557\u3057\u305f\u5834\u5408\u3001dynamic_cast \u306f\u30cc\u30eb\u30dd\u30a4\u30f3\u30bf (nullptr) \u3092\u8fd4\u3057\u305f\u308a\u3001(\u53c2\u7167\u306e\u5909\u63db\u306e\u5834\u5408) std::bad_cast \u4f8b\u5916\u3092\u9001\u51fa\u3057\u307e\u3059\u3002<\/p>\n

    \u30c0\u30a4\u30ca\u30df\u30c3\u30af\u30ad\u30e3\u30b9\u30c8\u306f\u3001\u591a\u614b\u6027\u3092\u6301\u3064\u30af\u30e9\u30b9\u968e\u5c64\u3067\u306e\u307f\u5229\u7528\u3067\u304d\u3001\u591a\u614b\u6027\u3092\u6301\u305f\u306a\u3044\u30af\u30e9\u30b9\u3067\u306f\u5229\u7528\u3067\u304d\u307e\u305b\u3093\u3002\u307e\u305f\u3001\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u30ad\u30e3\u30b9\u30c8\u306f\u3001\u5b9f\u884c\u6642\u306b\u578b\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u305f\u3081\u5b9f\u884c\u6642\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u6bd4\u8f03\u7684\u5927\u304d\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8981\u4ef6\u306e\u9ad8\u3044\u5834\u9762\u3067\u306f\u3001\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u30ad\u30e3\u30b9\u30c8\u3092\u591a\u7528\u3057\u306a\u3044\u3088\u3046\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u5b9f\u884c\u6642\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u578b\u30c1\u30a7\u30c3\u30af\u3068\u5909\u63db\u3092\u884c\u3046\u3001C++ \u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u3067\u3001\u591a\u614b\u6027\u306e\u3042\u308b\u30af\u30e9\u30b9\u968e\u5c64\u306b\u5bfe\u3057\u3066\u3001\u6d3e\u751f\u30af\u30e9\u30b9\u306e\u30dd\u30a4\u30f3\u30bf\u30fc\u304b\u53c2\u7167\u3092\u3001\u57fa\u5e95\u30af\u30e9\u30b9\u306e\u30dd\u30a4\u30f3\u30bf\u30fc\u304b\u53c2\u7167\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u7528\u3044\u3089\u308c\u307e\u3059\u3002 \u52d5\u7684\u5f37\u5236\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067 […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-134840","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u52d5\u7684\u30ad\u30e3\u30b9\u30c8 - 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