{"id":3592,"date":"2012-07-19T09:10:08","date_gmt":"2012-07-19T00:10:08","guid":{"rendered":"http:\/\/www.moonmile.net\/blog\/archives\/3592"},"modified":"2014-06-12T10:47:53","modified_gmt":"2014-06-12T01:47:53","slug":"c-%e3%83%a9%e3%83%a0%e3%83%80%e5%bc%8f%e3%81%af-stdfounction-%e3%81%a7%e4%bf%9d%e5%ad%98%e3%81%9b%e3%82%88","status":"publish","type":"post","link":"http:\/\/www.moonmile.net\/blog\/archives\/3592","title":{"rendered":"[c++] \u30e9\u30e0\u30c0\u5f0f\u306f std::function \u3067\u4fdd\u5b58\u305b\u3088"},"content":{"rendered":"

\n\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3092\u7121\u7406\u77e2\u7406\u53d6\u5f97\u3057\u3066\u3001\u5225\u306e\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u306b\u5165\u308c\u308b\u65b9\u6cd5 | Moonmile Solutions Blog
\nhttp:\/\/www.moonmile.net\/blog\/archives\/3580<\/a>\n<\/p>\n

\n\u306a\u3068\u3053\u308d\u3067\u3001\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3092\u7121\u7406\u77e2\u7406 void * \u306b\u5165\u308c\u3066\u4fdd\u5b58\u3059\u308c\u3070 ok ? \u3068\u5984\u60f3\u3057\u3066\u3044\u305f\u306e\u3067\u3059\u304c\u3001\u3044\u3084\u3044\u3084\u3001std::function \u3092\u4f7f\u3048\u3070 lambda \u5f0f\u3092\u4fdd\u5b58\u3067\u304d\u308b\u3088\u3001\u3068\u3044\u3046\u8a71\u3067\u3059\u3002
\n\u8981\u306f\u3001for_each \u3084 remove_if \u306e\u3088\u3046\u306a algorithm \u7cfb\u306e\u95a2\u6570\u306b\u8a2d\u5b9a\u3059\u308b\u95a2\u6570\u3092\u3069\u3046\u3057\u305f\u3089 class \u306b\u62bc\u3057\u8fbc\u3081\u308b\u304b\uff1f\u3068\u3044\u3046\u554f\u984c\u3060\u3063\u305f\u306e\u3067\u3002\n<\/p>\n

\n\u25a0\u5b9f\u9a13\u7528\u306e\u30bd\u30fc\u30b9\n<\/p>\n

\n\u5b9f\u9a13\u3057\u305f\u30b3\u30fc\u30c9\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u3059\u3002\n<\/p>\n

\r\n#include <string>\r\n#include <iostream>\r\n#include <vector>\r\n#include <algorithm>\r\n#include <functional>\r\nusing namespace std;\r\n\r\nclass Alice \r\n{\r\nprotected:\r\n\tvector<string> _lst;\r\npublic:\r\n\tAlice() {\r\n\t\t_lst.push_back(&quot;alice&quot;);\r\n\t\t_lst.push_back(&quot;luwis&quot;);\r\n\t\t_lst.push_back(&quot;lolita&quot;);\r\n\t}\r\n\tvoid disp1() {\r\n\t\t\/\/ lambda \u5f0f\u3092\u76f4\u63a5\u6271\u3046\r\n\t\tfor_each( _lst.begin(), _lst.end(),\r\n\t\t\t[](string &s){ cout << &quot;name: &quot; << s << endl; });\r\n\t}\r\n\tvoid disp2() {\r\n\t\t\/\/ lambda \u5f0f\u3092\u4e00\u5ea6 auto \u5909\u6570\u306b\u5165\u308c\u308b\r\n\t\tauto func = [](string &s){ cout << &quot;name: &quot; << s << endl; };\r\n\t\tfor_each( _lst.begin(), _lst.end(), func );\r\n\t}\r\n\t\r\n\t\/\/ \u3053\u3093\u306a\u98a8\u306b\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u3067\u6271\u3046\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u306e\u304b\uff1f\r\n\tvoid func(string s) {\r\n\t\tcout << &quot;name: &quot; << s << endl; \r\n\t}\r\n\tvoid disp3() {\r\n\t\t\/\/ \u3053\u308c\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\r\n\t\t\/\/ for_each( _lst.begin(), _lst.end(), func );\r\n\t\t\/\/ \u3053\u308c\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\r\n\t\t\/\/ for_each( _lst.begin(), _lst.end(), mem_fun(&Alice::func));\r\n\t\t\/\/ \u4ee3\u66ff\u6848\u3068\u3057\u3066 lambda \u3067\u304f\u308b\u3080\r\n\t\tfor_each( _lst.begin(), _lst.end(),\r\n\t\t\t[this](string s){ this->func(s); });\r\n\t}\r\n\t\r\n\r\n\t\/\/ std::function \u3067\u5b9a\u7fa9\t\r\n\tfunction<void(string)> func1 ;\r\n\tvoid disp4() {\r\n\t\t\/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u7b49\u3067\u5b9a\u7fa9\u3057\u3066\u304a\u304f\r\n\t\tthis->func1 = [](string s){ cout << &quot;name: &quot; << s << endl; };\r\n\t\t\/\/ \u30af\u30e9\u30b9\u306e\u5185\u90e8\u95a2\u6570\u98a8\u306b\u547c\u3073\u51fa\u3059\r\n\t\tfor_each( _lst.begin(), _lst.end(), func1 );\r\n\t}\r\n};\r\n\r\nint main( void )\r\n{\r\n\tAlice alice;\r\n\t\r\n\talice.disp1();\r\n\talice.disp2();\r\n\talice.disp3();\r\n\talice.disp4();\r\n\t\r\n\treturn 0;\r\n}\r\n<\/pre>\n
\nAlice::disp3 \u306e\u3088\u3046\u306b\u3001Alice::func \u3092\u8868\u793a\u7528\u306e\u95a2\u6570\u3068\u3057\u3066 for_each \u304b\u3089\u547c\u3073\u51fa\u3057\u305f\u3044\u308f\u3051\u3067\u3059\u3002
\n\u666e\u901a\u306b lambda \u5f0f\u3092\u4f7f\u3046\u306e\u304c\u826f\u3044\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u3092 Alice \u30af\u30e9\u30b9\u306e\u5185\u90e8\u95a2\u6570\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3066\u304a\u304d\u305f\u3044\u308f\u3051\u3067\u3059\u3002\u3053\u308c\u306f\u3001lambda \u5f0f\u306e\u4e2d\u8eab\u304c\u8907\u96d1\u5316\u3057\u305f\u308a\u8907\u6570\u306e\u5834\u6240\u3067\u4f7f\u308f\u308c\u308b\u3068\u304d\u306b\u3001\u4e00\u62ec\u7ba1\u7406\u3057\u3066\u304a\u304d\u305f\u3044\u3068\u3044\u3046\u60f3\u5b9a\u3067\u3059\u3002lambda \u5f0f\u81ea\u4f53\u306f auto \u5909\u6570\u306b\u4ee3\u5165\u3057\u3066\u304a\u304f\u3068\u3001\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u306f\u5229\u7528\u3067\u304d\u308b\u306e\u3067\u3059\u304c\u3001\u4ed6\u3067\u306f\u518d\u5229\u7528\u3067\u304d\u306a\u3044\u306e\u3067\u3001\u30af\u30e9\u30b9\u5185\u306e\u30e1\u30f3\u30d0\u95a2\u6570\u3068\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u8a33\u3067\u3059\u3002\n<\/p>\n
\n\u3067\u3001\u901a\u5e38\u306e\u30e1\u30f3\u30d0\u95a2\u6570\u306e\u5834\u5408\u306f &Alice::func \u306e\u3088\u3046\u306b\u53d6\u308c\u308b\u306e\u3067\u3059\u304c\u3001for_each \u306b\u6e21\u3055\u306a\u3044\u3044\u3051\u306a\u3044\u306e\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u95a2\u6570\u304b\u3001\u8981\u7d20\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u306a\u306e\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001vector \u3068\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u8981\u7d20\u306e\u578b\u3067\u3042\u308b string \u306b\u95a2\u6570\u3092\u4ed5\u8fbc\u3080\u306e\u306f\u7121\u7406\u304c\u3042\u308a\u307e\u3059\u3002avoid \u306a\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001string \u3092\u4e00\u65e6\u304f\u308b\u3080\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u304b\u306a\u308a\u5197\u9577\u3067\u3059\u3002\n<\/p>\n
\n\u305d\u3053\u3067\u51fa\u305f\u4ee3\u6848\u3068\u3057\u3066\u306f\u3001\n<\/p>\n
\r\n\t\t\/\/ \u4ee3\u66ff\u6848\u3068\u3057\u3066 lambda \u3067\u304f\u308b\u3080\r\n\t\tfor_each( _lst.begin(), _lst.end(),\r\n\t\t\t[this](string s){ this->func(s); });\r\n<\/pre>\n
\n\u306a\u65b9\u6cd5\u3067\u3059\u3002\u975e\u5e38\u306b\u30c0\u30b5\u3044\u3067\u3059\u304c\u3001\u4e00\u5ea6 lambda \u5f0f\u3067\u304f\u308b\u3093\u3067\u30e1\u30f3\u30d0\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002\u307e\u3042\u3001\u30c0\u30b5\u3044\u3067\u3059\u304c\u5b9f\u7528\u306b\u306f\u8010\u3048\u3089\u308c\u307e\u3059\u306d\u3002\n<\/p>\n
\n\u3058\u3083\u3042\u3001\u3072\u3087\u3063\u3068\u3059\u308b\u3068\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3092\u306a\u3093\u3089\u304b\u306e\u5f62\u3067 void * \u3068\u3057\u3066\u4fdd\u5b58\u3057\u3066\u304a\u3044\u3066\u3001\u5229\u7528\u3059\u308b\u6642\u306b\u3082\u3046\u4e00\u5ea6\u5143\u306e\u95a2\u6570\u578b\u306b\u76f4\u3057\u3066\u3084\u308c\u3070\u3001\u52d5\u304f\u306e\u3067\u306f\u306a\u3044\u304b\uff1f\u3068\u601d\u3063\u305f\u306e\u304c\u3001\u300c\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3092\u7121\u7406\u77e2\u7406\u53d6\u5f97\u3057\u3066\uff5e\u300d\u306e\u65b9\u6cd5\u306a\u306e\u3067\u3059\u304c\u3001\u3044\u3084\u3044\u3084\u3001\u305d\u3053\u307e\u3067\u3084\u308b\u5fc5\u8981\u306f\u306a\u304b\u3063\u305f\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\n<\/p>\n
\r\n\t\/\/ std::function \u3067\u5b9a\u7fa9\t\r\n\tfunction<void(string)> func1 ;\r\n\tvoid disp4() {\r\n\t\t\/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u7b49\u3067\u5b9a\u7fa9\u3057\u3066\u304a\u304f\r\n\t\tthis->func1 = [](string s){ cout << &quot;name: &quot; << s << endl; };\r\n\t\t\/\/ \u30af\u30e9\u30b9\u306e\u5185\u90e8\u95a2\u6570\u98a8\u306b\u547c\u3073\u51fa\u3059\r\n\t\tfor_each( _lst.begin(), _lst.end(), func1 );\r\n\t}\r\n<\/pre>\n
\nstd::function \u578b\u3068\u3057\u3066\u30e1\u30f3\u30d0\u5909\u6570\u3092\u5b9a\u7fa9\u3057\u3066\u304a\u304d\u3001\u305d\u306e\u5909\u6570\u306b lambda \u5f0f\u3092\u4ee3\u5165\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u672c\u6765\u306f\u3001\u3053\u3053\u3092\u672c\u5f53\u306e\u30e1\u30f3\u30d0\u95a2\u6570\u306b\u3057\u305f\u3044\u3068\u3053\u308d\u3067\u3059\u304c\u3001\u8d05\u6ca2\u306f\u8a00\u3044\u307e\u305b\u3093\uff08\u82e6\u7b11\uff09\u3002\u3053\u308c\u3067\u5b9f\u7528\u306b\u8010\u3048\u3089\u308c\u308b\u306e\u3067\u3002
\n\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304b\u306a\u3093\u3089\u304b\u306e initialize \u95a2\u6570\u3092\u4f5c\u3063\u3066\u304a\u3044\u3066\u3001lambda \u5f0f\u3092\u5909\u6570\u306b\u5165\u308c\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u3053\u308c\u306f\u5909\u6570\u306a\u306e\u3067\u3001\u578b\u3055\u3048\u3042\u3063\u3066\u3044\u308c\u3070\u3001lambda \u5f0f\u3092\u5165\u308c\u66ff\u3048\u308b\u3053\u3068\u304c\u53ef\u80fd\u306a\u3093\u3067\u3059\u306d\u3002\u3053\u3046\u306a\u308b\u3068\u300cfor_each( _lst.begin(), _lst.end(), func1 );\u300d\u306e\u90e8\u5206\u306f\u307e\u3063\u305f\u304f\u5909\u3048\u305a\u306b\u3001func1 \u306e\u4e2d\u8eab\u3060\u3051\u3059\u308a\u304b\u3048\u3057\u3066\u307e\u3048\u3070\u8868\u793a\u304c\u5909\u308f\u308b\u3068\u3044\u3046\u4ed5\u7d44\u307f\u304c\u3067\u304d\u3042\u304c\u308a\u307e\u3059\u3002\n<\/p>\n
\n\u3053\u308c\u3067\u3001\u3072\u3068\u307e\u305a\u76ee\u7684\u306f\u9054\u6210\u3068\u3044\u3046\u3053\u3068\u3067\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3092\u7121\u7406\u77e2\u7406\u53d6\u5f97\u3057\u3066\u3001\u5225\u306e\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u306b\u5165\u308c\u308b\u65b9\u6cd5 | Moonmile Solutions Blog http:\/\/www.moonmile.net\/blog\/archives\/3580 \u306a\u3068\u3053\u308d\u3067\u3001\u95a2\u6570\u30dd\u30a4 … \u7d9a\u304d\u3092\u8aad\u3080 →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[22],"tags":[],"class_list":["post-3592","post","type-post","status-publish","format-standard","hentry","category-c"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts\/3592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/comments?post=3592"}],"version-history":[{"count":3,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts\/3592\/revisions"}],"predecessor-version":[{"id":5896,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts\/3592\/revisions\/5896"}],"wp:attachment":[{"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/media?parent=3592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/categories?post=3592"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/tags?post=3592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}