{"id":144,"date":"2019-01-07T18:27:35","date_gmt":"2019-01-07T09:27:35","guid":{"rendered":"http:\/\/hirlab.net\/nblog\/?p=144"},"modified":"2019-01-07T18:29:54","modified_gmt":"2019-01-07T09:29:54","slug":"c%e9%80%9f%e5%ba%a6%e5%ae%9f%e9%a8%93%ef%bc%81%e3%83%a1%e3%83%b3%e3%83%90%e5%a4%89%e6%95%b0%e3%81%a8getter%e3%81%af%e3%81%a9%e3%81%a3%e3%81%a1%e3%81%8c%e9%80%9f%e3%81%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/hirlab.net\/nblog\/category\/programming\/art_144\/","title":{"rendered":"C++\u901f\u5ea6\u5b9f\u9a13\uff01\u30e1\u30f3\u30d0\u5909\u6570\u3068Getter\u306f\u3069\u3063\u3061\u304c\u901f\u3044\uff1f"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_11 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">\u30b3\u30f3\u30c6\u30f3\u30c4<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/hirlab.net\/nblog\/category\/programming\/art_144\/#%E3%81%AF%E3%81%98%E3%82%81%E3%81%AB\" title=\"\u306f\u3058\u3081\u306b\">\u306f\u3058\u3081\u306b<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/hirlab.net\/nblog\/category\/programming\/art_144\/#%E5%AE%9F%E9%A8%93%E6%9D%A1%E4%BB%B6\" title=\"\u5b9f\u9a13\u6761\u4ef6\">\u5b9f\u9a13\u6761\u4ef6<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/hirlab.net\/nblog\/category\/programming\/art_144\/#%E5%AE%9F%E8%A1%8C%E7%92%B0%E5%A2%83\" title=\"\u5b9f\u884c\u74b0\u5883\">\u5b9f\u884c\u74b0\u5883<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/hirlab.net\/nblog\/category\/programming\/art_144\/#%E3%82%B3%E3%83%BC%E3%83%89\" title=\"\u30b3\u30fc\u30c9\">\u30b3\u30fc\u30c9<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/hirlab.net\/nblog\/category\/programming\/art_144\/#%E5%AE%9F%E9%A8%93%E7%B5%90%E6%9E%9C\" title=\"\u5b9f\u9a13\u7d50\u679c\">\u5b9f\u9a13\u7d50\u679c<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/hirlab.net\/nblog\/category\/programming\/art_144\/#%E3%81%BE%E3%81%A8%E3%82%81\" title=\"\u307e\u3068\u3081\">\u307e\u3068\u3081<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%E3%81%AF%E3%81%98%E3%82%81%E3%81%AB\"><\/span>\u306f\u3058\u3081\u306b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u666e\u6bb5\u304b\u3089C++\u3067\u4e2d~\u5927\u898f\u6a21\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u3066\u3044\u308b\u3068\u3001\u3069\u3046\u3057\u3066\u3082\u6c17\u306b\u306a\u3063\u3066\u304f\u308b\u306e\u304c<strong>\u51e6\u7406\u901f\u5ea6<\/strong>\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u500b\u4eba\u7684\u306b\u6c17\u306b\u306a\u3063\u305f\u300c\u30e1\u30f3\u30d0\u5909\u6570\u30a2\u30af\u30bb\u30b9\u3068Getter\u3067\u306e\u30a2\u30af\u30bb\u30b9\u306f\u3069\u306e\u7a0b\u5ea6\u306e\u51e6\u7406\u901f\u5ea6\u5dee\u304c\u51fa\u308b\u306e\u304b\u300d\u3092\u5b9f\u9a13\u3057\u305f\u3002<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"%E5%AE%9F%E9%A8%93%E6%9D%A1%E4%BB%B6\"><\/span>\u5b9f\u9a13\u6761\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"%E5%AE%9F%E8%A1%8C%E7%92%B0%E5%A2%83\"><\/span>\u5b9f\u884c\u74b0\u5883<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5b9f\u9a13\u306f\u50d5\u306e\u30ce\u30fc\u30c8PC\u3067\u884c\u3044\u307e\u3057\u305f\u304c\u3001\u7c21\u5358\u306b\u5b9f\u884c\u74b0\u5883\u3092\u8f09\u305b\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<table class=\"table table-hover table-condensed\">\n<tr>\n<td>IDE<\/td>\n<td>CLion 2017.1.3 &copy; Jetbrains<\/td>\n<\/tr>\n<tr>\n<td>CPU<\/td>\n<td>Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz(4 CPUs)<\/td>\n<\/tr>\n<tr>\n<td>\u30e1\u30e2\u30ea<\/td>\n<td>8GB<\/td>\n<\/tr>\n<\/table>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"%E3%82%B3%E3%83%BC%E3%83%89\"><\/span>\u30b3\u30fc\u30c9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5148\u306b\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u8f09\u305b\u3066\u304a\u304d\u307e\u3059\u3002\u6642\u9593\u8a08\u6e2c\u306fC++11\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308bchrono\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u8a66\u884c\u56de\u6570\u306f10\u56de\u3067\u3001\u7d50\u679c\u306f\u305d\u306e\u5e73\u5747\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3057\u3066\u5b9f\u9a13\u306f4\u7a2e\u985e\u3067\u3001\u30e1\u30f3\u30d0\u5909\u6570\u3092\u76f4\u63a5\u53c2\u7167\u3001Getter\u3067\u53c2\u7167\u306b\u52a0\u3048\u3001\u6c17\u306b\u306a\u3063\u305f\u306e\u3067\u578b\u3092\u5909\u3048\u3066\u5b9f\u9a13\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<pre class=\"brush:cpp\">\n#include &lt;iostream>\n#include &lt;iomanip>\n#include &lt;chrono>\nusing namespace std;\n\nclass sample{\nprivate:\n    int x    = 1;\n    double y = 1.0;\n\npublic:\n    int getX(){ return this->x; }\n    double getY(){ return this->y; }\n\n    void ex1(){\n        \/\/\u5b9f\u9a131: (int)\u30e1\u30f3\u30d0\u5909\u6570\u3092\u76f4\u63a5\u53c2\u7167\n        int sum = 0;\n        for( int i = 0 ; i < 100000000; i++ ){\n            sum += x;\n        }\n    }\n    void ex2(){\n        \/\/\u5b9f\u9a132: (double)\u30e1\u30f3\u30d0\u5909\u6570\u3092\u76f4\u63a5\u53c2\u7167\n        int sum = 0;\n        for( int i = 0 ; i < 100000000; i++ ){\n            sum += y;\n        }\n    }\n    void ex3(){\n        \/\/\u5b9f\u9a133: (int)\u30e1\u30f3\u30d0\u5909\u6570\u3092Getter\u3067\u53c2\u7167\n        int sum = 0;\n        for( int i = 0 ; i < 100000000; i++ ){\n            sum += getX();\n        }\n    }\n    void ex4(){\n        \/\/\u5b9f\u9a134: (double)\u30e1\u30f3\u30d0\u5909\u6570\u3092Getter\u3067\u53c2\u7167\n        int sum = 0;\n        for( int i = 0 ; i < 100000000; i++ ){\n            sum += getY();\n        }\n    }\n};\n\n\nint main(){\n\n    sample test;\n    chrono::system_clock::time_point start, end;\n    double meanTime =0.0; \/\/ \u5e73\u5747\u5b9f\u884c\u6642\u9593\n    double trials   = 10; \/\/\u8a66\u884c\u56de\u6570\n\n    for( int i = 0; i < trials; ++i ){\n        start = chrono::system_clock::now();\n        test.ex1();\n        end = chrono::system_clock::now();\n        double elapsed = chrono::duration_cast&lt;chrono::milliseconds>(end - start).count() \/ 1000.0;\n        meanTime += elapsed;\n    }\n\n    \/\/ \u5e73\u5747\u5b9f\u884c\u6642\u9593\u3092\u51fa\u529b\n    cout << fixed << setprecision(5) << meanTime \/ trials << \"s\" << endl;\n}\n<\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"%E5%AE%9F%E9%A8%93%E7%B5%90%E6%9E%9C\"><\/span>\u5b9f\u9a13\u7d50\u679c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5b9f\u9a13\u7d50\u679c\u306f\u4ee5\u4e0b\u306e\u901a\u308a\uff01<\/p>\n\n\n\n<table class=\"table table-bordered\">\n<tr>\n<td>\u5b9f\u9a131([int]\u30e1\u30f3\u30d0\u5909\u6570\u3092\u76f4\u63a5\u53c2\u7167)<\/td><td>0.26400s<\/td>\n<\/tr>\n<tr>\n<td>\u5b9f\u9a132([double]\u30e1\u30f3\u30d0\u5909\u6570\u3092\u76f4\u63a5\u53c2\u7167)<\/td><td>0.61150s<\/td>\n<\/tr>\n<tr>\n<td>\u5b9f\u9a133([int]\u30e1\u30f3\u30d0\u5909\u6570\u3092Getter\u53c2\u7167)<\/td><td>0.33610s<\/td>\n<\/tr>\n<tr>\n<td>\u5b9f\u9a134([double]\u30e1\u30f3\u30d0\u5909\u6570\u3092Getter\u53c2\u7167)<\/td><td>0.63050s<\/td>\n<\/tr>\n<\/table>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"%E3%81%BE%E3%81%A8%E3%82%81\"><\/span>\u307e\u3068\u3081<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5b9f\u9a13\u7d50\u679c\u3088\u308a\u308f\u305a\u304b\u3067\u3042\u308b\u304c\u30e1\u30f3\u30d0\u5909\u6570\u3092\u76f4\u63a5\u53c2\u7167\u3057\u305f\u307b\u3046\u304c\u901f\u3044\u3053\u3068\u304c\u5206\u304b\u3063\u305f\u3002\u305f\u3060\u60f3\u50cf\u3057\u3066\u3044\u305f\u3088\u308a\u3082\u5927\u304d\u306a\u5dee\u306f\u306a\u304b\u3063\u305f\u3002<\/p>\n\n\n\n<p>\u3084\u3063\u3071\u308a\u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u3063\u3066\u51e6\u7406\u901f\u5ea6\u9045\u3044\u306e\u306d\u30fc\u3002<\/p>\n\n\n\n[bfcc id=\"cppex1\"]\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u666e\u6bb5\u304b\u3089C++\u3067\u4e2d~\u5927\u898f\u6a21\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u3066\u3044\u308b\u3068\u3001\u3069\u3046\u3057\u3066\u3082\u6c17\u306b\u306a\u3063\u3066\u304f\u308b\u306e\u304c\u51e6\u7406\u901f\u5ea6\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u500b\u4eba\u7684\u306b\u6c17\u306b\u306a\u3063\u305f\u300c\u30e1\u30f3\u30d0\u5909\u6570\u30a2\u30af\u30bb\u30b9\u3068Getter\u3067\u306e\u30a2\u30af\u30bb\u30b9\u306f\u3069\u306e\u7a0b\u5ea6\u306e\u51e6\u7406\u901f\u5ea6\u5dee\u304c\u51fa\u308b\u306e\u304b\u300d\u3092\u5b9f\u9a13\u3057\u305f\u3002<\/p>\n","protected":false},"author":1,"featured_media":153,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[12,23],"_links":{"self":[{"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/posts\/144"}],"collection":[{"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/comments?post=144"}],"version-history":[{"count":10,"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/posts\/144\/revisions"}],"predecessor-version":[{"id":155,"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/posts\/144\/revisions\/155"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/media\/153"}],"wp:attachment":[{"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/media?parent=144"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/categories?post=144"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hirlab.net\/nblog\/wp-json\/wp\/v2\/tags?post=144"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}