bliki: Tell Dont Ask
Tell-Don't-Ask is a principle that helps people remember that object-orientation is about bundling data with the functions that operate on that data. It reminds us that rather than asking an object for data and acting on that data, we should instead tell an object what to do. This encourages to move behavior into an object to go with the data. Let's clarify with an example. Let's imagine we need t
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C++ãŒä»–ã®ã‚ªãƒ–ジェクト指å‘言語ã¨æ¯”ã¹ã¦é›£ã—ã„ã®ã¯ã€ã‚„ã¯ã‚Šãƒ¡ãƒ¢ãƒªç®¡ç†ã‚’プãƒã‚°ãƒ©ãƒžãŒè‡ªåˆ†ã§ã—ãªã‘ã‚Œã°ã„ã‘ãªã„点ã ã¨æ€ã„ã¾ã™ã€‚よãよã注æ„ã—ãªã„ã¨ã€å‰Šé™¤ã—忘れãŸã‚Šã€åŒã˜ã‚ªãƒ–ジェクトを2度削除ã—ã¦ã—ã¾ã†ã¨ã„ã†ã‚¨ãƒ©ãƒ¼ãŒç™ºç”Ÿã—ã¾ã™ã€‚ã“ã®ãƒŽãƒ¼ãƒˆã§ã¯ã€ã‚ªãƒ–ジェクトを「値オブジェクトã€ã¨ã€Œå‚照オブジェクトã€ã¨ã„ã†ã‚«ãƒ†ã‚´ãƒªã«åˆ†ã‘ã€è©³ç´°è¨è¨ˆã®æ®µéšŽã§æ³¨æ„ã™ã¹ã点を整ç†ã—ã¦ãŠããŸã„ã¨æ€ã„ã¾ã™ã€‚ 0. ã¯ã˜ã‚ã« ç§è‡ªèº«ä»Šã¾ã§ã„ãã¤ã‹ã®ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžã‚’使ã£ã¦ãã¾ã—ãŸãŒã€C++ ãŒä»–ã®ã‚ªãƒ–ジェクト指å‘言語ã¨æ¯”ã¹ã¦é›£ã—ã„ã®ã¯ã€ã‚„ã¯ã‚Šãƒ¡ãƒ¢ãƒªç®¡ç†ã‚’プãƒã‚°ãƒ©ãƒžãŒè‡ªåˆ†ã§ã—ãªã‘ã‚Œã°ã„ã‘ãªã„点ã ã¨æ€ã„ã¾ã™ã€‚例ãˆã°ã€ Person* person = new Person(); ã¨ç”Ÿæˆã—ãŸã‚ªãƒ–ジェクトã¯ã€ä½¿ã„終ã‚ã£ãŸã‚‰æ¬¡ã®ã‚ˆã†ã«å‰Šé™¤ã—ãªã‘ã‚Œã°ãªã‚Šã¾ã›ã‚“。 delete person; 生æˆã—ã¦ã™ã削除ã™ã‚‹ãªã‚‰ç°¡å˜ãªã®ã§ã™ãŒã€å®Ÿéš›ã«
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