{"id":3588,"date":"2012-07-18T11:57:31","date_gmt":"2012-07-18T02:57:31","guid":{"rendered":"http:\/\/www.moonmile.net\/blog\/archives\/3588"},"modified":"2012-07-22T23:44:13","modified_gmt":"2012-07-22T14:44:13","slug":"c-for_each-%e3%81%a8-mem_fun-%e3%81%ae%e9%96%a2%e4%bf%82%e3%82%92%e3%83%a1%e3%83%a2%e6%9b%b8%e3%81%8d","status":"publish","type":"post","link":"http:\/\/www.moonmile.net\/blog\/archives\/3588","title":{"rendered":"[c++] for_each \u3068 mem_fun \u306e\u95a2\u4fc2\u3092\u30e1\u30e2\u66f8\u304d"},"content":{"rendered":"

c++ \u3067 lambda \u5f0f\u3092\u4f7f\u3046\u3068 for_each \u3092\u4f7f\u3046\u306e\u304c\u697d\u306b\u306a\u308b…\u306e\u3067\u3059\u304c\u3001\u4e00\u5fdc\u3001\u4ee5\u524d\u306e\u66f8\u304d\u65b9\u3092\u30e1\u30e2\u3002<\/p>\n

\r\n#include <string>\r\n#include <iostream>\r\n#include <vector>\r\n#include <algorithm>\r\nusing namespace std;\r\n\r\nstatic void f1( string s ) {\r\n\tcout << s << endl;\r\n}\r\n\r\nint main( void )\r\n{\r\n\tvector<string> lines;\r\n\tlines.push_back(&quot;masuda&quot;);\r\n\tlines.push_back(&quot;tomoaki&quot;);\r\n\tlines.push_back(&quot;alice&quot;);\r\n\r\n\t\/\/ \u666e\u901a\u306bfor\u3092\u4f7f\u3046\r\n\tfor( auto it=lines.begin(); it!=lines.end(); ++it ) {\r\n\t\tcout << (*it) << endl;\r\n\t}\r\n\r\n\t\/\/ for_each \u3068 lambda \u3092\u4f7f\u3046\r\n\tfor_each( lines.begin(), lines.end(),\r\n\t\t[](string s){ cout << s << endl; });\r\n\r\n\t\/\/ for_each \u3068 static \u95a2\u6570\u3092\u4f7f\u3046\r\n\tfor_each( lines.begin(), lines.end(), f1 );\r\n\r\n\t\/\/ for_each \u3068 auto \u95a2\u6570\u3092\u4f7f\u3046\r\n\tauto f2 = [](string s){ cout << s << endl; };\r\n\tfor_each( lines.begin(), lines.end(), f2 );\r\n\r\n\treturn 0;\r\n}\r\n<\/pre>\n
\u30ce\u30fc\u30de\u30eb\u306b for \u6587\u3092\u4f7f\u3063\u3066\u66f8\u304f\u3068\u4e00\u6642\u5909\u6570\u304c\u5fc5\u8981\u306b\u306a\u308b\u3002auto \u304c\u7121\u304b\u3063\u305f\u6642\u4ee3\u306b\u306f\u300cvector::iterator it = lines.begin()\u300d\u3068\u66f8\u304b\u306a\u3044\u3068\u99c4\u76ee\u3060\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u3053\u306e\u3042\u305f\u308a\u306f auto \u3092\u4f7f\u3048\u3070\u5341\u5206\u3002\u3053\u306e\u9577\u3044\u66f8\u304d\u65b9\u304c\u5acc\u3067 typedef \u3057\u305f\u308a\u3059\u308b\u306e\u3067\u3059\u304c\u3001\u4eca\u306f\u4e0d\u8981\u3067\u3059\u3002<\/p>\n
\r\n\t\/\/ \u666e\u901a\u306bfor\u3092\u4f7f\u3046\r\n\tfor( auto it=lines.begin(); it!=lines.end(); ++it ) {\r\n\t\tcout << (*it) << endl;\r\n\t}\r\n<\/pre>\n
for_each \u3068 lambda \u5f0f\u3092\u4f7f\u3046\u3068\u3053\u3093\u306a\u611f\u3058\u3002iterator \u304c\u305d\u306e\u307e\u307e\u30e9\u30e0\u30c0\u5f0f\u306e\u5f15\u6570\u306b\u5165\u308b\u306e\u3067\u305d\u308c\u3092\u4f7f\u3048\u3070OK\u3067\u3059\u3002
\n\u3053\u306e\u3042\u305f\u308a\u304c LINQ \u3063\u307d\u304f\u66f8\u3051\u308b\u3063\u3066\u3053\u3068\u306a\u306e\u3067\u3059\u304c\u3001\u3053\u306e\u307e\u307e\u3067\u306f\u307b\u3069\u9060\u3044\u304b\u306a\u3068\u3002\u307e\u3042\u3001\u6163\u308c\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u3092 lambda \u5f0f\u306e\u5f15\u6570\u3068\u3057\u3066\u53d7\u3051\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u306e\u304c\u3044\u307e\u3044\u3061\u3067\u3059\u3002<\/p>\n
\r\n\t\/\/ for_each \u3068 lambda \u3092\u4f7f\u3046\r\n\tfor_each( lines.begin(), lines.end(),\r\n\t\t[](string s){ cout << s << endl; });\r\n<\/pre>\n
lambda \u5f0f\u3092 auto \u3067\u53d7\u3051\u3066\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3068\u3057\u3066\u4f7f\u3046\u65b9\u6cd5\u3067\u3059\u3002lambda \u5f0f\u90e8\u5206\u304c\u9577\u3044\u5834\u5408\u3084\u3001\u52d5\u7684\u306b\u5207\u308a\u66ff\u3048\u305f\u3044\u5834\u5408\u306b\u4f7f\u3048\u308b…\u3068\u601d\u3046\u306e\u3067\u3059\u304c\u3088\u304f\u308f\u304b\u3089\u305a\u3002
\n\u672c\u6765\u306f\u3001\u3053\u306e auto \u3092\u95a2\u6570\u306e\u5916\u5074\u306b\u51fa\u3057\u305f\u3044\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u3092\u771f\u9762\u76ee\u306b\u51fa\u3059\u3068…<\/p>\n
\r\n\t\/\/ for_each \u3068 auto \u95a2\u6570\u3092\u4f7f\u3046\r\n\tauto f2 = [](string s){ cout << s << endl; };\r\n\tfor_each( lines.begin(), lines.end(), f2 );\r\n<\/pre>\n
\u4e0b\u8a18\u306e\u3088\u3046\u306b\u3001\u51e6\u7406\u95a2\u6570\u3092\u5916\u5074\u306b\u51fa\u3057\u307e\u3059\u3002\u3053\u308c\u3060\u3068\u666e\u901a\u3067\u3059\u306d\u3002\u3068\u3044\u3046\u304b\u3001\u3053\u308c\u304c\u6700\u521d\u306e for_each \u306e\u4f7f\u3044\u65b9\u3067\u3059\u3002<\/p>\n
\r\nstatic void f1( string s ) {\r\n\tcout << s << endl;\r\n}\r\n\r\n...\r\n\t\/\/ for_each \u3068 static \u95a2\u6570\u3092\u4f7f\u3046\r\n\tfor_each( lines.begin(), lines.end(), f1 );\r\n<\/pre>\n
\u25a0\u30af\u30e9\u30b9\u5185\u3067 for_each \u3092\u4f7f\u3046<\/p>\n
\u5148\u306e\u4f8b\u3067\u306f\u3001main \u95a2\u6570\u5185\u3067\u4f7f\u3063\u3066\u3044\u305f\u306e\u3067\u3059\u304c\u3001\u4eca\u5ea6\u306f\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u4f7f\u3063\u3066\u307f\u307e\u3059\u3002
\n\u4f7f\u3044\u65b9\u306f\u3001\u307e\u3042\u3001main \u95a2\u6570\u3068\u4e00\u7dd2\u3067\u3059\u3002\u5185\u90e8\u7684\u306b vector \u3067\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u6301\u3063\u3066\u3044\u3066 disp_for \u30e1\u30bd\u30c3\u30c9\u306a\u308a\u3001\u4e00\u62ec\u3067\u8868\u793a\u3055\u305b\u308b\u95a2\u6570\u3092\u60f3\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\r\nclass Alice\r\n{\r\npublic:\r\n\tvector<string> lines;\r\n\r\n\tAlice() {\r\n\t\tlines.push_back(&quot;masuda&quot;);\r\n\t\tlines.push_back(&quot;tomoaki&quot;);\r\n\t\tlines.push_back(&quot;alice&quot;);\r\n\t}\r\n\r\n\tvoid disp_for()\r\n\t{\r\n\t\t\/\/ \u666e\u901a\u306efor\u6587\r\n\t\tfor( auto it=lines.begin(); it!=lines.end(); ++it ) {\r\n\t\t\tcout << (*it) << endl;\r\n\t\t}\r\n\t}\r\n\tvoid disp_for_lambda() {\r\n\t\t\/\/ lambda \u5f0f\u3092\u4f7f\u3046\r\n\t\tfor_each( lines.begin(), lines.end(),\r\n\t\t\t[](string s){ cout << s << endl; });\r\n\t}\r\n\tvoid disp_for_auto() {\r\n\t\t\/\/ auto \u306b\u4ee3\u5165\u3057\u3066\u4f7f\u30461\r\n\t\tauto f2 = [](string s){ cout << s << endl; };\r\n\t\tfor_each( lines.begin(), lines.end(), f2 );\r\n\t}\r\n\r\n\tvoid f1(string s)\r\n\t{\r\n\t\tcout << s << endl;\r\n\t}\r\n\tvoid disp_for_inner_func()\r\n\t{\r\n\t\t\/\/ \u51fa\u6765\u305d\u3046\u3067\u3001\u3067\u304d\u306a\u3044\uff1f\uff1f\uff1f\r\n\t\t\/\/ for_each( lines.begin(), lines.end(), &Alice::f1 );\r\n\t\t\/\/ \u7d20\u76f4\u306b lambda \u5f0f\u304b\u3089\u547c\u3073\u51fa\u3059\r\n\t\tfor_each( lines.begin(), lines.end(),\r\n\t\t\t[this](string s){ this->f1(s); });\r\n\t}\r\n};\r\n<\/pre>\n
main \u95a2\u6570\u3068\u3061\u3087\u3063\u3068\u9055\u3046\u306e\u306f\u3001\u4ee5\u4e0b\u306e disp_for_inner_func \u30e1\u30bd\u30c3\u30c9\u306e\u3068\u3053\u308d\u3067\u3059\u3002
\n\u66f8\u304d\u65b9\u3068\u3057\u3066\u306f\u3001for_each \u3067 Alice \u30af\u30e9\u30b9\u306e\u5185\u90e8\u95a2\u6570 f1 \u3092\u4f7f\u3044\u305f\u3044\u3068\u3053\u308d\u306a\u306e\u3067\u3059\u304c…\u3053\u308c\u306f\u51fa\u6765\u307e\u305b\u3093\u3002
\n\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u300c&Alice::f1\u300d\u3092\u4f7f\u3063\u3066\u3001lambda \u5f0f\u306e\u3088\u3046\u306b\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u3092\u5f15\u6570\u306b\u3057\u3066\u3001\u3068\u601d\u3063\u3066\u4f7f\u3063\u3066\u307f\u308b\u3068\u3001\u3069\u3046\u3084\u3063\u3066\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308a\u307e\u305b\u3093\u3002<\/p>\n
\r\n\tvoid f1(string s)\r\n\t{\r\n\t\tcout << s << endl;\r\n\t}\r\n\tvoid disp_for_inner_func()\r\n\t{\r\n\t\t\/\/ \u51fa\u6765\u305d\u3046\u3067\u3001\u3067\u304d\u306a\u3044\uff1f\uff1f\uff1f\r\n\t\tfor_each( lines.begin(), lines.end(), &Alice::f1 );\r\n\t\t\/\/ \u7d20\u76f4\u306b lambda \u5f0f\u304b\u3089\u547c\u3073\u51fa\u3059\r\n\t\tfor_each( lines.begin(), lines.end(),\r\n\t\t\t[this](string s){ this->f1(s); });\r\n\t}\r\n<\/pre>\n
VC++ \u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\r\nC:\\Program Files\\Microsoft Visual Studio 10.0\\VC\\INCLUDE\\algorithm(22) : error C\r\n2064: 1 \u5f15\u6570\u3092\u53d6\u308a\u8fbc\u3080\u95a2\u6570\u306b\u306f\u8a55\u4fa1\u3055\u308c\u307e\u305b\u3093\u3002\r\n        C:\\Program Files\\Microsoft Visual Studio 10.0\\VC\\INCLUDE\\algorithm(32) :\r\n \u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305f\u30af\u30e9\u30b9\u306e \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8 \u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316 '_Fn1 std::_For_each<std\r\n::basic_string<_Elem,_Traits,_Ax>*,_Fn1>(_InIt,_InIt,_Fn1)' \u306e\u53c2\u7167\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\r\n\u3055\u3044\r\n        with\r\n        [\r\n            _Fn1=void (__thiscall Alice::* )(std::string),\r\n            _Elem=char,\r\n            _Traits=std::char_traits<char>,\r\n            _Ax=std::allocator<char>,\r\n            _InIt=std::basic_string<char,std::char_traits<char>,std::allocator<c\r\nhar>> *\r\n        ]\r\n        alice029.cpp(66) : \u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u305f\u30af\u30e9\u30b9\u306e \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8 \u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\r\n\u5316 '_Fn1 std::for_each<std::_Vector_iterator<_Myvec>,void(__thiscall Alice::* )(\r\nstd::string)>(_InIt,_InIt,_Fn1)' \u306e\u53c2\u7167\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\r\n        with\r\n        [\r\n            _Fn1=void (__thiscall Alice::* )(std::string),\r\n            _Myvec=std::_Vector_val<std::string,std::allocator<std::string>>,\r\n            _InIt=std::_Vector_iterator<std::_Vector_val<std::string,std::alloca\r\ntor<std::string>>>\r\n        ]\r\n<\/pre>\n
\u5b9f\u306f\u3001\u3053\u308c\u306f for_each \u306e\u4f7f\u3044\u65b9\u304c\u9593\u9055\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u306e\u3067\u3059\u3002<\/p>\n
\u25a0\u30e1\u30f3\u30d0\u95a2\u6570\u306f mem_func \u3092\u4f7f\u3046\u3002\u305f\u3060\u3057\u8981\u7d20\u306e\u30e1\u30f3\u30d0\u95a2\u6570\u306b\u9650\u308b<\/p>\n
for_each \u3067\u8a2d\u5b9a\u3059\u308b\u30eb\u30fc\u30d7\u95a2\u6570\u306f\u3001\u5b9f\u306f\u300c\u8981\u7d20\u300d\u306b\u5bfe\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306b\u306a\u308a\u307e\u3059\u3002lambda \u5f0f\u3092\u4f7f\u3046\u3068\u5206\u304b\u308a\u3065\u3089\u3044\u306e\u3067\u3059\u304c\u3001\u5148\u306e for_each \u3067\u306f\u3001vector \u306e string \u306b\u5bfe\u3057\u3066\u95a2\u6570\u304c\u9069\u7528\u3055\u308c\u308b\u3001\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002
\n\u306a\u306e\u3067\u3001\u30e1\u30f3\u30d0\u95a2\u6570\u3092 for_each \u306b\u6307\u5b9a\u3059\u308b\u5834\u5408\u306f\u3001\u305d\u306e\u30e1\u30f3\u30d0\u95a2\u6570\u3092\u6301\u3064\u8981\u7d20\u30af\u30e9\u30b9\u3092\u3064\u304f\u3089\u306a\u3044\u3068\u99c4\u76ee\u306a\u308f\u3051\u3067\u3059\u3088\u3002\u306a\u308b\u307b\u3069\u3002<\/p>\n
\r\nclass Point {\r\npublic:\r\n\tint x, y, z;\r\npublic:\r\n\tPoint(int x, int y, int z ) {\r\n\t\tthis->x = x;\r\n\t\tthis->y = y;\r\n\t\tthis->z = z;\r\n\t}\r\n\tvoid disp() {\r\n\t\tcout << x << &quot;,&quot; << y << &quot;,&quot; << z << endl;\r\n\t}\r\n};\r\n\r\nint main( void )\r\n{\r\n\t\/\/ mem_fun \u306f\u3053\u3046\u4f7f\u3046\r\n\tvector<Point*> ps;\r\n\tps.push_back( new Point(1,1,1));\r\n\tps.push_back( new Point(2,2,2));\r\n\tps.push_back( new Point(3,3,3));\r\n\tfor_each( ps.begin(), ps.end(), mem_fun(&Point::disp));\r\n}\r\n<\/pre>\n
\u3053\u3093\u306a\u98a8\u306b\u3001Point \u30af\u30e9\u30b9\u3092\u4f5c\u3063\u3066\u304a\u3044\u3066\u3001disp \u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u3068\u3044\u3046\u5834\u5408\u3092\u60f3\u5b9a\u3057\u307e\u3059\u3002
\nvector \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u5bfe\u3057\u3066\u3001for_each \u3092\u9069\u7528\u3059\u308b\u3068\u3001\u3053\u306e disp \u30e1\u30bd\u30c3\u30c9\u3092\u9069\u7528\u3059\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u3059\u3002
\n\u3067\u3001\u30e1\u30bd\u30c3\u30c9\u95a2\u6570\u306e\u5834\u5408\u306b\u306f\u305d\u306e\u307e\u307e\u9069\u7528\u3067\u304d\u306a\u3044\u306e\u3067\u3001\u4e0a\u8a18\u306e\u3088\u3046\u306b mem_fun \u3068\u3044\u3046\u88dc\u52a9\u95a2\u6570\u3092\u4f7f\u3044\u307e\u3059\u3002\u5185\u90e8\u7684\u306b\u306f\u3001vecotr::iterator \u306b\u5bfe\u3057\u3066 disp \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3068\u3044\u3046\u3001\u95a2\u6570\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u3046\u3068\u3044\u3046\u4f5c\u308a\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u78ba\u304b\u306b\u3001for_each \u3060\u3051\u3067\u306a\u304f\u3001remove_if \u3084 find_if \u306e\u3088\u3046\u306a\u6bd4\u8f03\u95a2\u6570\u3092\u8a2d\u5b9a\u3059\u308b\u5834\u5408\u3001\u8981\u7d20\u306b\u5bfe\u3057\u3066 comp \u95a2\u6570\u304c\u3042\u308b\u8a33\u3067\u3001\u7d0d\u5f97\u3067\u304d\u308b\u4ed5\u69d8\u3067\u3059\u3088\u306d\u3002<\/p>\n
\u3061\u306a\u307f\u306b\u3001find_if \u306b\u6bd4\u8f03\u95a2\u6570 comp \u3092\u8ffd\u52a0\u3057\u3066\u8868\u793a\u3055\u305b\u308b\u3068\u3053\u3093\u306a\u98a8\u306b\u306a\u308b\u3002<\/p>\n
\r\nclass Point {\r\npublic:\r\n\tint x, y, z;\r\npublic:\r\n\tPoint(int x, int y, int z ) {\r\n\t\tthis->x = x;\r\n\t\tthis->y = y;\r\n\t\tthis->z = z;\r\n\t}\r\n\tvoid disp() {\r\n\t\tcout << x << &quot;,&quot; << y << &quot;,&quot; << z << endl;\r\n\t}\r\n\tbool comp( Point *pt ) {\r\n\t\tif ( this->x == pt->x &&\r\n\t\t     this->y == pt->y &&\r\n\t\t     this->z == pt->z ) {\r\n\t\t\treturn true;\r\n\t\t} else {\r\n\t\t\treturn false;\r\n\t\t}\r\n\t}\r\n};\r\n\r\nint main( void )\r\n{\r\n\tPoint *p1 = new Point(2,2,2);\r\n\tauto it = find_if( ps.begin(), ps.end(),\r\n\t\tbind2nd(mem_fun(&Point::comp),p1));\r\n\tif ( it != ps.end() ) {\r\n\t\tcout << &quot;found.&quot; << endl;\r\n\t} else {\r\n\t\tcout << &quot;no found.&quot; << endl;\r\n\t}\r\n\treturn 0;\r\n}\r\n<\/pre>\n
\u6bd4\u8f03\u3059\u308b Point \u30dd\u30a4\u30f3\u30bf\u3092\u6e21\u3059\u305f\u3081\u306b\u3001bind2nd \u95a2\u6570\u3092\u4f7f\u3046\u3068\u3053\u308d\u304c\u300c\u30a2\u30ec\u300d\u3067\u3059\u304c\u3001\u307e\u3041\u3001\u3067\u304d\u307e\u3059\u3002
\n\u3046\u30fc\u3093\u3001C++ template \u30d1\u30ba\u30eb\u3092\u4f5c\u308a\u305f\u3044\u5834\u5408\u306f\u3053\u308c\u3067\u3082\u3044\u3044\u306e\u3067\u3059\u304c\u3001\u5b9f\u904b\u7528\u3068\u3057\u3066\uff08\u7279\u306b\u53ef\u8aad\u6027\u3068\u3057\u3066\u306f\uff09\u306f\u3053\u308c\u306f\u3044\u307e\u3044\u3061\u304b\u306a\u3041\u3068\u5e38\u3005\u601d\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u306e comp \u3068\u3044\u3046\u6bd4\u8f03\u95a2\u6570\u3067\u3059\u304c\u3001Point \u30af\u30e9\u30b9\u306b\u5c5e\u3055\u306a\u3044\u3068\u99c4\u76ee\u306a\u3068\u3053\u308d\u304c\u6b20\u70b9\u3067\u3059\u3088\u306d\u3002vector \u306e\u5834\u5408\u306f\u3088\u3044\u306e\u3067\u3059\u304c\u3001\u3055\u3066\u3001vector\u3068\u304b\u3001vector\u306e\u5834\u5408\u306f\u3069\u3046\u3059\u308c\u3070\u826f\u3044\u306e\u304b\uff1f\u3063\u3066\u3053\u3068\u3067\u3059\u3002\u6bd4\u8f03\u95a2\u6570\u3068\u3057\u3066 equal_to() \u3068\u304b\u4f7f\u3048\u3070\u3044\u3044\u3093\u3067\u3059\u304b\u306d\uff1f<\/p>\n
\r\n\tauto b = find_if( lines.begin(), lines.end(),\r\n\t\tbind2nd( equal_to<string>(), &quot;tomoaki&quot; ));\r\n\tif ( b != lines.end() ) {\r\n\t\tcout << &quot;found.&quot; << endl;\r\n\t} else {\r\n\t\tcout << &quot;no found.&quot; << endl;\r\n\t}\r\n<\/pre>\n
\u307e\u3042\u3001\u6163\u308c\u308b\u3068\u305d\u308c\u3067\u3082\u3044\u3044\u306e\u3067\u3059\u304c\u3001lambda \u5f0f\u304c\u3042\u3063\u305f\u308a LINQ \u304c\u3042\u3063\u305f\u308a\u3059\u308b\u6642\u4ee3\u306a\u306e\u3067\u3001\u3061\u3087\u3063\u3068\u30d1\u30ba\u30eb\u306f\u5acc\u3060\u306a\u3041\u3068\u3002
\n\u4eca\u3060\u3063\u305f\u3089\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306b lambda \u5f0f\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\r\n\t\/\/ lambda \u3092\u4f7f\u3046\r\n\tauto b2 = find_if( lines.begin(), lines.end(),\r\n\t\t[](string s)->bool{ return s == &quot;tomoaki&quot;; });\r\n\tif ( b2 != lines.end() ) {\r\n\t\tcout << &quot;found.&quot; << endl;\r\n\t} else {\r\n\t\tcout << &quot;no found.&quot; << endl;\r\n\t}\r\n<\/pre>\n
\u3053\u306e\u307b\u3046\u304c\u53ef\u8aad\u6027\u304c\u9ad8\u3044\u3067\u3059\u3001\u3068\u79c1\u306f\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u25a0\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u306a\u30af\u30e9\u30b9\u306b\u6bd4\u8f03\u95a2\u6570\u3092\u3064\u3051\u308b\u306e\u304b\uff1f<\/p>\n
\u3067\u3001\u8a71\u3092\u623b\u3059\u3068\u3001<\/p>\n
\r\n\tvoid disp_for_inner_func()\r\n\t{\r\n\t\t\/\/ \u51fa\u6765\u305d\u3046\u3067\u3001\u3067\u304d\u306a\u3044\uff1f\uff1f\uff1f\r\n\t\t\/\/ for_each( lines.begin(), lines.end(), &Alice::f1 );\r\n\t\t\/\/ \u7d20\u76f4\u306b lambda \u5f0f\u304b\u3089\u547c\u3073\u51fa\u3059\r\n\t\tfor_each( lines.begin(), lines.end(),\r\n\t\t\t[this](string s){ this->f1(s); });\r\n\t}\r\n<\/pre>\n
\u306e\u3068\u3053\u308d\u3067\u3001\u5185\u90e8\u95a2\u6570\u3092\u6e21\u305b\u308b\u307b\u3046\u304c\u8aad\u307f\u65b9\u3068\u3057\u3066\u306f\u79c1\u306b\u306f\u306a\u3093\u3068\u306a\u304f\u81ea\u7136\u306a\u8a33\u3067\u3059\u3002remove_if \u3084 find_if \u306b\u306f equal_to \u306e\u3088\u3046\u306a\u95a2\u6570\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u30ab\u30b9\u30bf\u30e0\u8868\u793a\u306e\u3088\u3046\u306a disp \u95a2\u6570\u306e\u5834\u5408\u306f\u7121\u7406\u3067\u3059\u3088\u306d\u3002
\n\u9003\u308c\u308b\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001\u30e9\u30e0\u30c0\u5f0f\u304b\u3089\u30e1\u30f3\u30d0\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u306e\u3067\u3001\u3053\u308c\u3067\u5341\u5206\u7528\u9014\u306f\u8db3\u308a\u308b\u306e\u3067\u3059\u304c\u306a\u3093\u304b\u30c0\u30b5\u3044\u3002\u3002\u3002<\/p>\n
\r\nclass Point {\r\npublic:\r\n\tint x, y, z;\r\npublic:\r\n\tPoint(int x, int y, int z ) {\r\n\t\tthis->x = x;\r\n\t\tthis->y = y;\r\n\t\tthis->z = z;\r\n\t}\r\n\tvoid disp() {\r\n\t\tcout << x << &quot;,&quot; << y << &quot;,&quot; << z << endl;\r\n\t}\r\n\tbool comp( Point *pt ) {\r\n\t\tif ( this->x == pt->x &&\r\n\t\t     this->y == pt->y &&\r\n\t\t     this->z == pt->z ) {\r\n\t\t\treturn true;\r\n\t\t} else {\r\n\t\t\treturn false;\r\n\t\t}\r\n\t}\r\n};\r\n<\/pre>\n
\u3042\u3068\u3001\u767a\u60f3\u3068\u3057\u3066 Point \u30af\u30e9\u30b9\u306b\u6bd4\u8f03\u95a2\u6570\u306a\u3069\u306a\u3069\u304c\u4ed8\u3051\u52a0\u308f\u308b\u306e\u3082\u3044\u307e\u3044\u3061\u306a\u306e\u3067\u3059\u3002Point \u30af\u30e9\u30b9\u306f\u30c7\u30fc\u30bf\u30af\u30e9\u30b9\u3068\u3057\u3066\u5fc5\u8981\u6700\u4f4e\u9650\u306b\u3068\u3069\u3081\u3066\u304a\u304d\u305f\u3044\u3057\u3001\u306e\u3061\u306e\u3061\u306b\u62e1\u5f35\u3055\u305b\u306a\u3044\u3088\u3046\u306b\u3057\u305f\u3044\u3002C++ \u7684\u306b\u306f include \u5148\u304c\u5909\u66f4\u3055\u308c\u308b\u306e\u306f\u907f\u3051\u305f\u3044\u308f\u3051\u3067\u3001\u305d\u3046\u306a\u308b\u3068\u300c\u5c06\u6765\u8ffd\u52a0\u3055\u308c\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u300dcomp \u95a2\u6570\u306a\u3069\u3092\u8ffd\u52a0\u3057\u3066\u304a\u304f\u306e\u306f\u300c\u5230\u5e95\u7121\u7406\u300d\u306a\u8a33\u3067\u3059\u3002
\n\u305d\u3046\u306a\u308b\u3068\u3001comp \u95a2\u6570\u306e\u307b\u3046\u3082\u4f7f\u3046\u3068\u304d\u306b\u9069\u5b9c\u7528\u610f\u3059\u308b\u306e\u304c\u9069\u5f53\u3067\u3001<\/p>\n
\r\nAlice {\r\n\tvector<Point*> ps;\r\npublic:\r\n\tbool comp( Point *p1, Point *p2 ) {\r\n\t\tif ( p1->x == p2->x &&\r\n             p1->x == p2->y &&\r\n             p1->x == p2->z ) {\r\n\t\t\treturn true;\r\n\t\t} else {\r\n\t\t\treturn false;\r\n\t\t}\r\n\t}\r\n\tbool find( Point *p ) {\r\n\t\treturn for_each( ps.begin(), ps.end(),\r\n\t\t\t&Alice::comp, p );\r\n\t}\r\n};\r\n<\/pre>\n
\u306a\u98a8\u306b\u30012\u3064\u306e\u5f15\u6570\u3092\u6301\u3064 comp \u30e1\u30bd\u30c3\u30c9\u3092 for_each \u304b\u3089\u76f4\u63a5\u547c\u3073\u51fa\u305b\u305f\u3089\u3088\u3044\u306a\u3041\u3001\u3068\u3002comp \u30e1\u30bd\u30c3\u30c9\u306e\u4e2d\u8eab\u306f\u3053\u3053\u3067\u306f x,y,z \u306e\u5168\u3066\u3092\u6bd4\u8f03\u3057\u3066\u3044\u307e\u3059\u304c\u3001workarea \u306a\u3069\u3092\u542b\u3081\u308b\u3068\u72ec\u81ea\u306b comp \u3092\u4f5c\u3063\u305f\u307b\u3046\u304c\u826f\u3044\u5834\u5408\u304c\u591a\u3044\u306e\u3067\u3059\u3002\u9ad8\u901f\u5316\u306e\u305f\u3081\u306b\u5185\u90e8\u7684\u306b\u306f id \u3092\u6bd4\u8f03\u3059\u308b\u3060\u3051\u3068\u304b\u3002<\/p>\n
\u3042\u3068\u306f\u3001LINQ \u98a8\u306b<\/p>\n
\r\nbool find( Point *p ) {\r\n\treturn ps.from( it ).where(it == *p );\r\n}\r\n\r\n\u3042\u308b\u3044\u306f\r\n\r\nbool find( Point *p ) {\r\n\tauto result = ps.from(it).where(it==*p);\r\n\treturn result != ps.end();\r\n}\r\n<\/pre>\n
\u3068\u3057\u3066\u3057\u307e\u3046\u3068\u304b\u3002\u307e\u3042\u3001\u3053\u3063\u3061\u306e\u306f\u8a71\u306f\u307e\u305f\u5225\u306e\u6a5f\u4f1a\u306b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
c++ \u3067 lambda \u5f0f\u3092\u4f7f\u3046\u3068 for_each \u3092\u4f7f\u3046\u306e\u304c\u697d\u306b\u306a\u308b…\u306e\u3067\u3059\u304c\u3001\u4e00\u5fdc\u3001\u4ee5\u524d\u306e\u66f8\u304d\u65b9\u3092\u30e1\u30e2\u3002 #include <string> #include <iostream&g … \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-3588","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\/3588","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=3588"}],"version-history":[{"count":4,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts\/3588\/revisions"}],"predecessor-version":[{"id":3591,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/posts\/3588\/revisions\/3591"}],"wp:attachment":[{"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/media?parent=3588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/categories?post=3588"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.moonmile.net\/blog\/wp-json\/wp\/v2\/tags?post=3588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}