{"id":1177,"date":"2018-04-28T15:00:29","date_gmt":"2018-04-28T07:00:29","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=1177"},"modified":"2018-04-28T15:00:29","modified_gmt":"2018-04-28T07:00:29","slug":"c-lambda%e5%87%bd%e6%95%b0%e5%ad%a6%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/1177","title":{"rendered":"c++ Lambda\u51fd\u6570\u5b66\u4e60"},"content":{"rendered":"

c++ Lambda\u51fd\u6570\u5b66\u4e60<\/a><\/h1>\n
<\/div>\n
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\u6216\u8bb8\uff0cLambda \u8868\u8fbe\u5f0f\u7b97\u5f97\u4e0a\u662f C++ 11 \u65b0\u589e\u7279\u6027\u4e2d\u6700\u6fc0\u52a8\u4eba\u5fc3\u7684\u4e00\u4e2a\u3002\u8fd9\u4e2a\u5168\u65b0\u7684\u7279\u6027\u542c\u8d77\u6765\u5f88\u6df1\u5965\uff0c\u4f46\u5374\u662f\u5f88\u591a\u5176\u4ed6\u8bed\u8a00\u65e9\u5df2\u63d0\u4f9b\uff08\u6bd4\u5982 C#\uff09\u6216\u8005\u5373\u5c06\u63d0\u4f9b\uff08\u6bd4\u5982 Java\uff09\u7684\u3002\u7b80\u800c\u8a00\u4e4b\uff0cLambda \u8868\u8fbe\u5f0f\u5c31\u662f\u7528\u4e8e\u521b\u5efa\u533f\u540d\u51fd\u6570\u7684\u3002GCC 4.5.x \u548c Microsoft Visual Studio \u65e9\u5df2\u63d0\u4f9b\u4e86\u5bf9 lambda \u8868\u8fbe\u5f0f\u7684\u652f\u6301\u3002\u5728 GCC 4.7 \u4e2d\uff0c\u9ed8\u8ba4\u662f\u4e0d\u5f00\u542f C++ 11 \u7279\u6027\u7684\uff0c\u9700\u8981\u6dfb\u52a0 -std=c++11 \u7f16\u8bd1\u53c2\u6570\u3002\u800c VS2010 \u5219\u9ed8\u8ba4\u5f00\u542f\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u8bf4 lambda \u8868\u8fbe\u5f0f\u5982\u6b64\u6fc0\u52a8\u4eba\u5fc3\u5462\uff1f\u4e3e\u4e00\u4e2a\u4f8b\u5b50\u3002\u6807\u51c6 C++ \u5e93\u4e2d\u6709\u4e00\u4e2a\u5e38\u7528\u7b97\u6cd5\u7684\u5e93\uff0c\u5176\u4e2d\u63d0\u4f9b\u4e86\u5f88\u591a\u7b97\u6cd5\u51fd\u6570\uff0c\u6bd4\u5982 sort() \u548c find()\u3002\u8fd9\u4e9b\u51fd\u6570\u901a\u5e38\u9700\u8981\u63d0\u4f9b\u4e00\u4e2a\u201c\u8c13\u8bcd\u51fd\u6570 predicate function\u201d\u3002\u6240\u8c13\u8c13\u8bcd\u51fd\u6570\uff0c\u5c31\u662f\u8fdb\u884c\u4e00\u4e2a\u64cd\u4f5c\u7528\u7684\u4e34\u65f6\u51fd\u6570\u3002\u6bd4\u5982 find() \u9700\u8981\u4e00\u4e2a\u8c13\u8bcd\uff0c\u7528\u4e8e\u67e5\u627e\u5143\u7d20\u6ee1\u8db3\u7684\u6761\u4ef6\uff1b\u80fd\u591f\u6ee1\u8db3\u8c13\u8bcd\u51fd\u6570\u7684\u5143\u7d20\u624d\u4f1a\u88ab\u67e5\u627e\u51fa\u6765\u3002\u8fd9\u6837\u7684\u8c13\u8bcd\u51fd\u6570\uff0c\u4f7f\u7528\u4e34\u65f6\u7684\u533f\u540d\u51fd\u6570\uff0c\u65e2\u53ef\u4ee5\u51cf\u5c11\u51fd\u6570\u6570\u91cf\uff0c\u53c8\u4f1a\u8ba9\u4ee3\u7801\u53d8\u5f97\u6e05\u6670\u6613\u8bfb\u3002<\/p>\n

\u4e0b\u9762\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n

#include<\/span> <algorithm><\/span><\/span>\r\n#include<\/span> <cmath><\/span><\/span>\r\n\r\nvoid<\/span> abssort<\/span>(float<\/span> *x, unsigned<\/span> N)<\/span>\r\n<\/span>{\r\n  std<\/span>::sort(x,\r\n            x + N,\r\n            [](float<\/span> a, float<\/span> b) { return<\/span> std<\/span>::abs<\/span>(a) < std<\/span>::abs<\/span>(b); });\r\n}<\/code><\/pre>\n
\u4ece\u4e0a\u9762\u7684\u4f8b\u5b50\u6765\u770b\uff0c\u5c3d\u7ba1\u652f\u6301 lambda \u8868\u8fbe\u5f0f\uff0c\u4f46 C++ \u7684\u8bed\u6cd5\u770b\u8d77\u6765\u5374\u5f88\u201c\u795e\u5947\u201d\u3002lambda \u8868\u8fbe\u5f0f\u4f7f\u7528\u4e00\u5bf9\u65b9\u62ec\u53f7\u4f5c\u4e3a\u5f00\u59cb\u7684\u6807\u8bc6\uff0c\u7c7b\u4f3c\u4e8e\u58f0\u660e\u4e00\u4e2a\u51fd\u6570\uff0c\u53ea\u4e0d\u8fc7\u8fd9\u4e2a\u51fd\u6570\u6ca1\u6709\u540d\u5b57\uff0c\u4e5f\u5c31\u662f\u4e00\u4e2a\u533f\u540d\u51fd\u6570\u3002\u8fd9\u4e2a\u533f\u540d\u51fd\u6570\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff0ca\u548cb\uff1b\u5176\u8fd4\u56de\u503c\u662f\u4e00\u4e2a bool \u7c7b\u578b\u7684\u503c\uff0c\u6ce8\u610f\uff0c\u8fd4\u56de\u503c\u662f\u81ea\u52a8\u63a8\u65ad\u7684\uff0c\u4e0d\u9700\u8981\u663e\u5f0f\u58f0\u660e\uff0c\u4e0d\u8fc7\u8fd9\u662f\u6709\u6761\u4ef6\u7684\uff01\u6761\u4ef6\u5c31\u662f\uff0clambda \u8868\u8fbe\u5f0f\u7684\u8bed\u53e5\u53ea\u6709\u4e00\u4e2a return\u3002\u51fd\u6570\u7684\u4f5c\u7528\u662f\u6bd4\u8f83 a\u3001b \u7684\u7edd\u5bf9\u503c\u7684\u5927\u5c0f\u3002\u7136\u540e\uff0c\u5728\u6b64\u4f8b\u4e2d\uff0c\u8fd9\u4e2a lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u4e00\u4e2a\u95ed\u5305\u88ab\u4f20\u9012\u7ed9 std::sort() \u51fd\u6570\u3002<\/p>\n
\u4e0b\u9762\uff0c\u6211\u4eec\u6765\u8be6\u7ec6\u89e3\u91ca\u4e0b\u8fd9\u4e2a\u795e\u5947\u7684\u8bed\u6cd5\u5230\u5e95\u4ee3\u8868\u7740\u4ec0\u4e48\u3002<\/p>\n
\u6211\u4eec\u4ece\u53e6\u5916\u4e00\u4e2a\u4f8b\u5b50\u5f00\u59cb\uff1a<\/p>\n
std<\/span>::cout<\/span> << [](float<\/span> f) { return<\/span> std<\/span>::abs<\/span>(f); } (-3.5<\/span>);<\/code><\/pre>\n
\u8f93\u51fa\u503c\u662f\u4ec0\u4e48\uff1f3.5\uff01\u6ce8\u610f\uff0c\u8fd9\u662f\u4e00\u4e2a\u51fd\u6570\u5bf9\u8c61\uff08\u7531 lambda \u8868\u8fbe\u5f0f\u751f\u6210\uff09\uff0c\u5176\u5b9e\u53c2\u662f -3.5\uff0c\u8fd4\u56de\u503c\u662f\u53c2\u6570\u7684\u7edd\u5bf9\u503c\u3002lambda \u8868\u8fbe\u5f0f\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u662f\u8bed\u8a00\u81ea\u52a8\u63a8\u65ad\u7684\uff0c\u56e0\u4e3astd::abs()\u7684\u8fd4\u56de\u503c\u5c31\u662f float\u3002\u6ce8\u610f\uff0c\u524d\u9762\u6211\u4eec\u4e5f\u63d0\u5230\u4e86\uff0c\u53ea\u6709\u5f53 lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u8bed\u53e5\u201c\u8db3\u591f\u7b80\u5355\u201d\uff0c\u624d\u80fd\u81ea\u52a8\u63a8\u65ad\u8fd4\u56de\u503c\u7c7b\u578b\u3002<\/p>\n
C++ 11 \u7684\u8fd9\u79cd\u8bed\u6cd5\uff0c\u5176\u5b9e\u5c31\u662f\u533f\u540d\u51fd\u6570\u58f0\u660e\u4e4b\u540e\u9a6c\u4e0a\u8c03\u7528\uff08\u5426\u5219\u7684\u8bdd\uff0c\u5982\u679c\u8fd9\u4e2a\u533f\u540d\u51fd\u6570\u65e2\u4e0d\u8c03\u7528\uff0c\u53c8\u4e0d\u4f5c\u4e3a\u95ed\u5305\u4f20\u9012\u7ed9\u5176\u5b83\u51fd\u6570\uff0c\u90a3\u4e48\u8fd9\u4e2a\u533f\u540d\u51fd\u6570\u5c31\u6ca1\u6709\u4ec0\u4e48\u7528\u5904\uff09\u3002\u5982\u679c\u4f60\u89c9\u5f97\u5947\u602a\uff0c\u90a3\u4e48\u6765\u770b\u770b JavaScript \u7684\u8fd9\u79cd\u5199\u6cd5\uff1a<\/p>\n
function<\/span>()<\/span> {}<\/span> ()<\/span>;<\/span>\r\nfunction<\/span>(a)<\/span> {}<\/span> (-3.5)<\/span>;<\/span><\/code><\/pre>\n
C++ 11 \u7684\u5199\u6cd5\u5b8c\u5168\u7c7b\u4f3c JavaScript \u7684\u8bed\u6cd5\u3002<\/p>\n
\u5982\u679c\u6211\u4e0d\u60f3\u8ba9 lambda \u8868\u8fbe\u5f0f\u81ea\u52a8\u63a8\u65ad\u7c7b\u578b\uff0c\u6216\u8005\u662f lambda \u8868\u8fbe\u5f0f\u7684\u5185\u5bb9\u5f88\u590d\u6742\uff0c\u4e0d\u80fd\u81ea\u52a8\u63a8\u65ad\u600e\u4e48\u529e\uff1f\u6bd4\u5982\uff0cstd::abs(float)\u7684\u8fd4\u56de\u503c\u662f float\uff0c\u6211\u60f3\u628a\u5b83\u5f3a\u5236\u8f6c\u578b\u4e3a int\u3002\u90a3\u4e48\uff0c\u6b64\u65f6\uff0c\u6211\u4eec\u5c31\u5fc5\u987b\u663e\u5f0f\u6307\u5b9a lambda \u8868\u8fbe\u5f0f\u8fd4\u56de\u503c\u7684\u7c7b\u578b\uff1a<\/p>\n
std<\/span>::cout<\/span> << [](float<\/span> f) -> int<\/span> { return<\/span> std<\/span>::abs<\/span>(f); } (-3.5<\/span>);\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u8bed\u53e5\u4e0e\u524d\u9762\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0clambda \u8868\u8fbe\u5f0f\u7684\u8fd4\u56de\u65f6\u4e0d\u662f float \u800c\u662f int\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e0a\u9762\u8bed\u53e5\u7684\u8f93\u51fa\u503c\u662f 3\u3002\u8fd4\u56de\u503c\u7c7b\u578b\u7684\u6982\u5ff5\u540c\u666e\u901a\u7684\u51fd\u6570\u8fd4\u56de\u503c\u7c7b\u578b\u662f\u5b8c\u5168\u4e00\u6837\u7684\u3002<\/p>\n
\u5f53\u6211\u4eec\u60f3\u5f15\u7528\u4e00\u4e2a lambda \u8868\u8fbe\u5f0f\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528auto\u5173\u952e\u5b57\uff0c\u4f8b\u5982\uff1a<\/p>\n
auto<\/span> lambda = [] () -> int<\/span> { return<\/span> val * 100<\/span>; };<\/code><\/pre>\n
auto\u5173\u952e\u5b57\u5b9e\u9645\u4f1a\u5c06 lambda \u8868\u8fbe\u5f0f\u8f6c\u6362\u6210\u4e00\u79cd\u7c7b\u4f3c\u4e8estd::function\u7684\u5185\u90e8\u7c7b\u578b\uff08\u4f46\u5e76\u4e0d\u662fstd::function\u7c7b\u578b\uff0c\u867d\u7136\u4e0estd::function\u201c\u517c\u5bb9\u201d\uff09\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u8fd9\u4e48\u5199\uff1a<\/p>\n
std<\/span>::function<int<\/span>()> lambda = [] () -> int<\/span> { return<\/span> val * 100<\/span>; };<\/code><\/pre>\n
\u5982\u679c\u4f60\u5bf9std::function<int()>\u8fd9\u79cd\u5199\u6cd5\u611f\u5230\u5f88\u795e\u5947\uff0c\u53ef\u4ee5\u67e5\u770b C++ 11 \u7684\u6709\u5173std::function\u7684\u7528\u6cd5\u3002\u7b80\u5355\u6765\u8bf4\uff0cstd::function<int()>\u5c31\u662f\u4e00\u4e2a\u53ef\u8c03\u7528\u5bf9\u8c61\u6a21\u677f\u7c7b\uff0c\u4ee3\u8868\u4e00\u4e2a\u53ef\u8c03\u7528\u5bf9\u8c61\uff0c\u63a5\u53d7 0 \u4e2a\u53c2\u6570\uff0c\u8fd4\u56de\u503c\u662fint\u3002\u6240\u4ee5\uff0c\u5f53\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u63a5\u53d7\u4e00\u4e2adouble\u4f5c\u4e3a\u53c2\u6570\uff0c\u8fd4\u56deint\u7684\u5bf9\u8c61\u65f6\uff0c\u5c31\u53ef\u4ee5\u5199\u4f5c\uff1astd::function<int(double)>\u3002<\/int(double)><\/int()><\/int()><\/p>\n
\u5f15\u5165 lambda \u8868\u8fbe\u5f0f\u7684\u524d\u5bfc\u7b26\u662f\u4e00\u5bf9\u65b9\u62ec\u53f7\uff0c\u79f0\u4e3a lambda \u5f15\u5165\u7b26\uff08lambda-introducer\uff09\u3002lambda \u5f15\u5165\u7b26\u662f\u6709\u5176\u81ea\u5df1\u7684\u4f5c\u7528\u7684\uff0c\u4e0d\u4ec5\u4ec5\u662f\u8868\u660e\u4e00\u4e2a lambda \u8868\u8fbe\u5f0f\u7684\u5f00\u59cb\u90a3\u4e48\u7b80\u5355\u3002lambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u4f7f\u7528\u4e0e\u5176\u76f8\u540c\u8303\u56f4 scope \u5185\u7684\u53d8\u91cf\u3002\u8fd9\u4e2a\u5f15\u5165\u7b26\u7684\u4f5c\u7528\u5c31\u662f\u8868\u660e\uff0c\u5176\u540e\u7684 lambda \u8868\u8fbe\u5f0f\u4ee5\u4f55\u79cd\u65b9\u5f0f\u4f7f\u7528\uff08\u6b63\u5f0f\u7684\u672f\u8bed\u662f\u201c\u6355\u83b7\u201d\uff09\u8fd9\u4e9b\u53d8\u91cf\uff08\u8fd9\u4e9b\u53d8\u91cf\u80fd\u591f\u5728 lambda \u8868\u8fbe\u5f0f\u4e2d\u88ab\u6355\u83b7\uff0c\u5176\u5b9e\u5c31\u662f\u6784\u6210\u4e86\u4e00\u4e2a\u95ed\u5305\uff09\u3002\u76ee\u524d\u4e3a\u6b62\uff0c\u6211\u4eec\u770b\u5230\u7684\u4ec5\u4ec5\u662f\u4e00\u4e2a\u7a7a\u7684\u65b9\u62ec\u53f7\uff0c\u5176\u5b9e\uff0c\u8fd9\u4e2a\u5f15\u5165\u7b26\u662f\u76f8\u5f53\u7075\u6d3b\u7684\u3002\u4f8b\u5982\uff1a<\/p>\n
float<\/span> f0 = 1.0<\/span>;\r\nstd<\/span>::cout<\/span> << [=](float<\/span> f) { return<\/span> f0 + std<\/span>::abs<\/span>(f); } (-3.5<\/span>);<\/code><\/pre>\n
\u5176\u8f93\u51fa\u503c\u662f 4.5\u3002[=] \u610f\u5473\u7740\uff0clambda \u8868\u8fbe\u5f0f\u4ee5\u4f20\u503c\u7684\u5f62\u5f0f\u6355\u83b7\u540c\u8303\u56f4\u5185\u7684\u53d8\u91cf\u3002\u53e6\u5916\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
float<\/span> f0 = 1.0<\/span>;\r\nstd<\/span>::cout<\/span> << [&](float<\/span> f) { return<\/span> f0 += std<\/span>::abs<\/span>(f); } (-3.5<\/span>);\r\nstd<\/span>::cout<\/span> << '\\n'<\/span> << f0 << '\\n'<\/span>;<\/code><\/pre>\n
\u8f93\u51fa\u503c\u662f 4.5 \u548c 4.5\u3002[&] \u8868\u660e\uff0clambda \u8868\u8fbe\u5f0f\u4ee5\u4f20\u5f15\u7528\u7684\u65b9\u5f0f\u6355\u83b7\u5916\u90e8\u53d8\u91cf\u3002\u90a3\u4e48\uff0c\u4e0b\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
float<\/span> f0 = 1.0<\/span>;\r\nstd<\/span>::cout<\/span> << [=](float<\/span> f) mutable<\/span> { return<\/span> f0 += std<\/span>::abs<\/span>(f); } (-3.5<\/span>);\r\nstd<\/span>::cout<\/span> << '\\n'<\/span> << f0 << '\\n'<\/span>;<\/code><\/pre>\n
\u8fd9\u4e2a\u4f8b\u5b50\u5f88\u6709\u8da3\u3002\u9996\u5148\uff0c[=]\u610f\u5473\u7740\uff0clambda \u8868\u8fbe\u5f0f\u4ee5\u4f20\u503c\u7684\u5f62\u5f0f\u6355\u83b7\u5916\u90e8\u53d8\u91cf\u3002C++ 11 \u6807\u51c6\u8bf4\uff0c\u5982\u679c\u4ee5\u4f20\u503c\u7684\u5f62\u5f0f\u6355\u83b7\u5916\u90e8\u53d8\u91cf\uff0c\u90a3\u4e48\uff0clambda \u4f53\u4e0d\u5141\u8bb8\u4fee\u6539\u5916\u90e8\u53d8\u91cf\uff0c\u5bf9 f0 \u7684\u4efb\u4f55\u4fee\u6539\u90fd\u4f1a\u5f15\u53d1\u7f16\u8bd1\u9519\u8bef\u3002\u4f46\u662f\uff0c\u6ce8\u610f\uff0c\u6211\u4eec\u5728 lambda \u8868\u8fbe\u5f0f\u524d\u58f0\u660e\u4e86mutable\u5173\u952e\u5b57\uff0c\u8fd9\u5c31\u5141\u8bb8\u4e86 lambda \u8868\u8fbe\u5f0f\u4f53\u4fee\u6539 f0 \u7684\u503c\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u7684\u4f8b\u5b50\u672c\u5e94\u62a5\u9519\uff0c\u4f46\u662f\u7531\u4e8e\u6709 mutable \u5173\u952e\u5b57\uff0c\u5219\u4e0d\u4f1a\u62a5\u9519\u3002\u90a3\u4e48\uff0c\u4f60\u4f1a\u89c9\u5f97\u8f93\u51fa\u503c\u662f\u4ec0\u4e48\u5462\uff1f\u7b54\u6848\u662f\uff0c4.5 \u548c 1.0\u3002\u4e3a\u4ec0\u4e48 f0 \u8fd8\u662f 1.0\uff1f\u56e0\u4e3a\u6211\u4eec\u662f\u4f20\u503c\u7684\uff0c\u867d\u7136\u5728 lambda \u8868\u8fbe\u5f0f\u4e2d\u5bf9 f0 \u6709\u4e86\u4fee\u6539\uff0c\u4f46\u7531\u4e8e\u662f\u4f20\u503c\u7684\uff0c\u5916\u90e8\u7684 f0 \u4f9d\u7136\u4e0d\u4f1a\u88ab\u4fee\u6539\u3002<\/p>\n
\u4e0a\u9762\u7684\u4f8b\u5b50\u662f\uff0c\u6240\u6709\u7684\u53d8\u91cf\u8981\u4e48\u4f20\u503c\uff0c\u8981\u4e48\u4f20\u5f15\u7528\u3002\u90a3\u4e48\uff0c\u662f\u4e0d\u662f\u6709\u6df7\u5408\u673a\u5236\u5462\uff1f\u5f53\u7136\u4e5f\u6709\uff01\u6bd4\u5982\u4e0b\u9762\u7684\u4f8b\u5b50\uff1a<\/p>\n
float<\/span> f0 = 1.0f<\/span>;\r\nfloat<\/span> f1 = 10.0f<\/span>;\r\nstd<\/span>::cout<\/span> << [=, &f0](float<\/span> a) { return<\/span> f0 += f1 + std<\/span>::abs<\/span>(a); } (-3.5<\/span>);\r\nstd<\/span>::cout<\/span> << '\\n'<\/span> << f0 << '\\n'<\/span>;<\/code><\/pre>\n
\u8fd9\u4e2a\u4f8b\u5b50\u7684\u8f93\u51fa\u662f 14.5 \u548c 14.5\u3002\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cf0 \u901a\u8fc7\u5f15\u7528\u88ab\u6355\u83b7\uff0c\u800c\u5176\u5b83\u53d8\u91cf\uff0c\u6bd4\u5982 f1 \u5219\u662f\u901a\u8fc7\u503c\u88ab\u6355\u83b7\u3002<\/p>\n
\u4e0b\u9762\u6211\u4eec\u6765\u603b\u7ed3\u4e0b\u6240\u6709\u51fa\u73b0\u7684 lambda \u5f15\u5165\u7b26\uff1a<\/p>\n
[]        \/\/ \u4e0d\u6355\u83b7\u4efb\u4f55\u5916\u90e8\u53d8\u91cf<\/span>\r\n[=]      \/\/ \u4ee5\u503c\u7684\u5f62\u5f0f\u6355\u83b7\u6240\u6709\u5916\u90e8\u53d8\u91cf<\/span>\r\n[&]      \/\/ \u4ee5\u5f15\u7528\u5f62\u5f0f\u6355\u83b7\u6240\u6709\u5916\u90e8\u53d8\u91cf<\/span>\r\n[x, &y<\/span>] \/\/ x \u4ee5\u4f20\u503c\u5f62\u5f0f\u6355\u83b7\uff0cy \u4ee5\u5f15\u7528\u5f62\u5f0f\u6355\u83b7<\/span>\r\n[=, &z<\/span>]\/\/ z \u4ee5\u5f15\u7528\u5f62\u5f0f\u6355\u83b7\uff0c\u5176\u4f59\u53d8\u91cf\u4ee5\u4f20\u503c\u5f62\u5f0f\u6355\u83b7<\/span>\r\n[&, x]  \/\/ x \u4ee5\u503c\u7684\u5f62\u5f0f\u6355\u83b7\uff0c\u5176\u4f59\u53d8\u91cf\u4ee5\u5f15\u7528\u5f62\u5f0f\u6355\u83b7<\/span><\/code><\/pre>\n
\u53e6\u5916\u6709\u4e00\u70b9\u9700\u8981\u6ce8\u610f\u3002\u5bf9\u4e8e[=]\u6216[&]\u7684\u5f62\u5f0f\uff0clambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 this \u6307\u9488\u3002\u4f46\u662f\uff0c\u5bf9\u4e8e[]\u7684\u5f62\u5f0f\uff0c\u5982\u679c\u8981\u4f7f\u7528 this \u6307\u9488\uff0c\u5fc5\u987b\u663e\u5f0f\u4f20\u5165\uff1a<\/p>\n
[this<\/span>]() { this->someFunc(); }();<\/code><\/pre>\n
\u81f3\u6b64\uff0c\u6211\u4eec\u5df2\u7ecf\u5927\u81f4\u4e86\u89e3\u4e86 C++ 11 \u63d0\u4f9b\u7684 lambda \u8868\u8fbe\u5f0f\u7684\u6982\u5ff5\u3002\u5efa\u8bae\u901a\u8fc7\u7ed3\u5408 lambda \u8868\u8fbe\u5f0f\u4e0estd::sort()\u6216std::for_each()\u8fd9\u6837\u7684\u6807\u51c6\u51fd\u6570\u6765\u5c1d\u8bd5\u4f7f\u7528\u4e00\u4e0b\u5427\uff01<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
c++ Lambda\u51fd\u6570\u5b66\u4e60 \u6216\u8bb8\uff0cLa<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[118],"class_list":["post-1177","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1177","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=1177"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/1177\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=1177"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=1177"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=1177"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}