{"id":7429,"date":"2026-07-22T12:12:31","date_gmt":"2026-07-22T04:12:31","guid":{"rendered":"https:\/\/i007.cc\/wordpress\/?p=7429"},"modified":"2026-07-22T12:12:31","modified_gmt":"2026-07-22T04:12:31","slug":"lambda%e8%a1%a8%e8%be%be%e5%bc%8f%e7%9a%84%e5%ad%98%e5%9c%a8%e8%b7%9f%e5%87%bd%e6%95%b0%e7%9b%b8%e6%af%94%e6%9c%89%e4%bb%80%e4%b9%88%e5%bf%85%e8%a6%81%e6%80%a7%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/7429","title":{"rendered":"Lambda\u8868\u8fbe\u5f0f\u7684\u5b58\u5728\u8ddf\u51fd\u6570\u76f8\u6bd4\u6709\u4ec0\u4e48\u5fc5\u8981\u6027\u4e48\uff1f"},"content":{"rendered":"

\u8fd9\u662f\u4e2a\u5f88\u597d\u7684”\u5228\u6839\u95ee\u5e95”\u5f0f\u95ee\u9898\u2014\u2014\u8868\u9762\u4e0a Lambda \u80fd\u505a\u7684\u4e8b\uff0c\u666e\u901a\u51fd\u6570\u4f3c\u4e4e\u4e5f\u80fd\u505a\u3002\u4f46\u672c\u8d28\u533a\u522b\u5728\u4e8e\u51e0\u4e2a\u666e\u901a\u51fd\u6570\u505a\u4e0d\u5230\uff08\u6216\u5f88\u522b\u626d\uff09\u7684\u80fd\u529b\u3002<\/p>\n

\n

\ud83d\udd37 \u6838\u5fc3\u533a\u522b\u4e00\uff1aLambda \u80fd”\u6355\u83b7”\u4e0a\u4e0b\u6587\uff0c\u666e\u901a\u51fd\u6570\u4e0d\u80fd<\/h3>\n
\n
\n
<\/div>\n<\/div>\n
cpp<\/div>\n
\n
<\/code><\/pre>\n
int threshold = 5;\r\n\r\n\/\/ \u274c \u666e\u901a\u51fd\u6570\u505a\u4e0d\u5230\u8fd9\u6837\u76f4\u63a5\u8bbf\u95ee\u5916\u90e8\u5c40\u90e8\u53d8\u91cf\r\nbool isAboveThreshold(int x) {\r\n    return x > threshold;  \/\/ \u8fd9\u91cc\u7684 threshold \u5fc5\u987b\u662f\u5168\u5c40\u53d8\u91cf\u624d\u884c\uff01\r\n}\r\n\r\n\/\/ \u2705 Lambda \u53ef\u4ee5\u6355\u83b7\u5c40\u90e8\u53d8\u91cf\r\nauto isAbove = [threshold](int x) { return x > threshold; };<\/pre>\n
<\/code><\/pre>\n<\/div>\n<\/div>\n
\u666e\u901a\u51fd\u6570\u7684\u5c34\u5c2c<\/strong>\uff1a\u5982\u679c\u60f3\u8ba9\u51fd\u6570”\u77e5\u9053” threshold<\/code>\uff0c\u8981\u4e48\uff1a<\/p>\n
    \n
  • \u628a threshold<\/code> \u8bbe\u4e3a\u5168\u5c40\u53d8\u91cf\uff08\u6c61\u67d3\u5168\u5c40\u547d\u540d\u7a7a\u95f4\uff0c\u96be\u7ef4\u62a4\uff09<\/li>\n
  • \u591a\u4f20\u4e00\u4e2a\u53c2\u6570\uff08\u4f46 STL \u7b97\u6cd5\u7684\u56de\u8c03\u7b7e\u540d\u901a\u5e38\u662f\u56fa\u5b9a\u7684\uff0c\u6ca1\u6cd5\u591a\u4f20\uff09<\/li>\n<\/ul>\n
    \n
    \n
    <\/div>\n<\/div>\n
    cpp<\/div>\n
    \n
    std::vector<int> v = {1, 6, 3, 8, 2};\r\n\r\n\/\/ STL\u7b97\u6cd5\u8981\u6c42\u56de\u8c03\u53ea\u63a5\u6536\u4e00\u4e2a\u53c2\u6570 (int)\uff0c\u6ca1\u6cd5\u585e\u5165 threshold\r\nstd::count_if(v.begin(), v.end(), isAboveThreshold);  \/\/ \u53ea\u80fd\u7528\u5168\u5c40\u53d8\u91cf\u7248\u672c\r\n\r\n\/\/ Lambda \u5b8c\u7f8e\u89e3\u51b3\uff1a\u95ed\u5305\u81ea\u5e26\u4e0a\u4e0b\u6587\r\nint threshold = 5;\r\nstd::count_if(v.begin(), v.end(), \r\n    [threshold](int x) { return x > threshold; });  \/\/ \u2705 \u7075\u6d3b\uff01<\/pre>\n
     <\/p>\n<\/div>\n<\/div>\n
    \n
    \u8fd9\u662f Lambda \u5b58\u5728\u7684\u6700\u6838\u5fc3\u7406\u7531<\/strong>\uff1a\u5b83\u662f\u4e00\u4e2a”\u81ea\u5e26\u6570\u636e\u7684\u51fd\u6570”\uff0c\u800c\u666e\u901a\u51fd\u6570\u662f”\u65e0\u72b6\u6001\u7684\u4ee3\u7801\u5757”\u3002<\/p>\n<\/blockquote>\n
    \n
    \ud83d\udd37 \u6838\u5fc3\u533a\u522b\u4e8c\uff1a\u5c31\u5730\u5b9a\u4e49\uff0c\u907f\u514d”\u4ee3\u7801\u5730\u7406\u4f4d\u7f6e”\u5206\u79bb<\/h3>\n
    \n
    \n
    <\/div>\n<\/div>\n
    cpp<\/div>\n
    \n
    \/\/ \u4e0d\u7528 Lambda\uff1a\u903b\u8f91\u88ab\u8feb\u62c6\u5230\u5f88\u8fdc\u7684\u5730\u65b9\r\nbool myCompare(int a, int b) { return a > b; }  \/\/ \u5b9a\u4e49\u5728\u6587\u4ef6\u9876\u90e8\r\n\r\nvoid doSomething() {\r\n    std::vector<int> v = {3, 1, 4, 1, 5};\r\n    std::sort(v.begin(), v.end(), myCompare);  \/\/ \u7528\u7684\u65f6\u5019\u8981\u8dd1\u53bb\u770b myCompare \u662f\u5565\r\n}\r\n\r\n\/\/ \u2705 \u7528 Lambda\uff1a\u903b\u8f91\u5c31\u5730\u53ef\u89c1\uff0c\u9605\u8bfb\u4ee3\u7801\u4e0d\u7528\"\u8df3\u8f6c\"\r\nvoid doSomething() {\r\n    std::vector<int> v = {3, 1, 4, 1, 5};\r\n    std::sort(v.begin(), v.end(), \r\n        [](int a, int b) { return a > b; });  \/\/ \u4e00\u773c\u770b\u61c2\u6392\u5e8f\u89c4\u5219\r\n}<\/pre>\n
     <\/p>\n<\/div>\n<\/div>\n
    \u8fd9\u5bf9\u4e00\u6b21\u6027\u3001\u7b80\u77ed<\/strong>\u7684\u903b\u8f91\u7279\u522b\u91cd\u8981\u2014\u2014\u4e13\u95e8\u4e3a\u5b83\u547d\u540d\u3001\u653e\u5230\u522b\u5904\u5b9a\u4e49\uff0c\u53cd\u800c\u589e\u52a0\u9605\u8bfb\u8d1f\u62c5\u3002<\/p>\n
    \n
    \ud83d\udd37 \u6838\u5fc3\u533a\u522b\u4e09\uff1aLambda \u662f”\u5bf9\u8c61”\uff0c\u53ef\u4ee5\u6709\u72b6\u6001\u3001\u53ef\u4ee5\u88ab\u5b58\u50a8<\/h3>\n
    \n
    \n
    <\/div>\n<\/div>\n
    cpp<\/div>\n
    \n
    \/\/ \u51fd\u6570\u6307\u9488\u53ea\u80fd\u6307\u5411\u5df2\u5b58\u5728\u7684\u51fd\u6570\uff0c\u672c\u8eab\u65e0\u72b6\u6001\r\nint (*funcPtr)(int) = someFunction;\r\n\r\n\/\/ Lambda \u672c\u8d28\u662f\u4e00\u4e2a\u5bf9\u8c61\uff08\u7f16\u8bd1\u5668\u751f\u6210\u7684\u533f\u540d\u7c7b\u7684\u5b9e\u4f8b\uff09\r\nauto makeAdder = [](int base) {\r\n    return [base](int x) mutable { return base + x; };  \/\/ \u95ed\u5305\u5bf9\u8c61\uff0c\u643a\u5e26\u72b6\u6001\r\n};\r\n\r\nauto add5 = makeAdder(5);\r\nadd5(10);  \/\/ \u2192 15\uff0c\u8fd9\u4e2a\"\u52a05\u5668\"\u662f\u4e00\u4e2a\u643a\u5e26\u4e86\u72b6\u6001(5)\u7684\u53ef\u8c03\u7528\u5bf9\u8c61<\/pre>\n
     <\/p>\n<\/div>\n<\/div>\n
    \u666e\u901a\u51fd\u6570\u505a\u4e0d\u5230”\u751f\u6210\u4e00\u4e2a\u5e26\u6709\u81ea\u5df1\u4e13\u5c5e\u6570\u636e\u7684\u53ef\u8c03\u7528\u5b9e\u4f53”\u2014\u2014\u8fd9\u6b63\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\u91cc**\u95ed\u5305(closure)**\u7684\u672c\u8d28\u3002<\/p>\n
    \n
    \ud83d\udd37 \u4e00\u4e2a\u5bf9\u6bd4\u8868\uff0c\u770b\u6e05\u672c\u8d28<\/h3>\n
    \n\n\n\n\n\n\n\n\n\n
    <\/th>\n\u666e\u901a\u51fd\u6570<\/th>\nLambda<\/th>\n<\/tr>\n<\/thead>\n
    \u80fd\u5426\u8bbf\u95ee\u5916\u90e8\u5c40\u90e8\u53d8\u91cf<\/td>\n\u274c \u4e0d\u80fd<\/td>\n\u2705 \u80fd\uff08\u6355\u83b7\uff09<\/td>\n<\/tr>\n
    \u662f\u5426\u80fd”\u643a\u5e26\u72b6\u6001”<\/td>\n\u274c \u65e0\u72b6\u6001<\/td>\n\u2705 \u53ef\u4ee5\uff08\u95ed\u5305\uff09<\/td>\n<\/tr>\n
    \u5b9a\u4e49\u4f4d\u7f6e<\/td>\n\u5fc5\u987b\u63d0\u524d\/\u522b\u5904\u5b9a\u4e49<\/td>\n\u53ef\u4ee5\u5c31\u5730\u5b9a\u4e49<\/td>\n<\/tr>\n
    \u672c\u8d28<\/td>\n\u4ee3\u7801\u6bb5<\/td>\n\u5bf9\u8c61<\/strong>\uff08\u6709\u7c7b\u578b\u3001\u53ef\u62f7\u8d1d\uff09<\/td>\n<\/tr>\n
    \u9002\u5408\u573a\u666f<\/td>\n\u590d\u7528\u3001\u72ec\u7acb\u3001\u547d\u540d\u6e05\u6670\u7684\u903b\u8f91<\/td>\n\u4e00\u6b21\u6027\u3001\u4f9d\u8d56\u4e0a\u4e0b\u6587\u7684\u903b\u8f91<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
    \n
    \ud83d\udd37 \u90a3\u662f\u4e0d\u662f Lambda \u80fd\u5b8c\u5168\u53d6\u4ee3\u51fd\u6570\uff1f<\/h3>\n
    \u4e0d\u662f<\/strong>\u3002\u666e\u901a\u51fd\u6570\u4f9d\u7136\u66f4\u9002\u5408\uff1a<\/p>\n
    \n
    \n
    <\/div>\n<\/div>\n
    cpp<\/div>\n
    \n
    \/\/ \u590d\u6742\u3001\u53ef\u590d\u7528\u3001\u9700\u8981\u88ab\u591a\u5904\u8c03\u7528\u7684\u903b\u8f91 \u2192 \u7528\u666e\u901a\u51fd\u6570\uff0c\u66f4\u6613\u8bfb\u3001\u6613\u6d4b\u8bd5\r\nint calculateTax(double income, TaxBracket bracket) {\r\n    \/\/ \u51e0\u5341\u884c\u590d\u6742\u903b\u8f91...\r\n}\r\n\r\n\/\/ \u4e00\u6b21\u6027\u3001\u7b80\u77ed\u3001\u4f9d\u8d56\u4e0a\u4e0b\u6587\u7684\u903b\u8f91 \u2192 \u7528 Lambda\r\nstd::sort(items.begin(), items.end(), \r\n    [](const Item& a, const Item& b) { return a.price < b.price; });<\/pre>\n
     <\/p>\n<\/div>\n<\/div>\n
    \n
    \u4e00\u53e5\u8bdd\u603b\u7ed3<\/h3>\n
    \n
    \u666e\u901a\u51fd\u6570<\/strong>\u56de\u7b54”\u505a\u4ec0\u4e48”\uff1bLambda<\/strong> \u989d\u5916\u56de\u7b54\u4e86”\u5728\u4ec0\u4e48\u4e0a\u4e0b\u6587\u91cc\u505a”\u2014\u2014\u5b83\u628a\u4ee3\u7801\u548c\u6570\u636e\u6253\u5305\u6210\u4e86\u4e00\u4e2a\u6574\u4f53\uff0c\u8fd9\u662f\u51fd\u6570\u6307\u9488\/\u666e\u901a\u51fd\u6570\u5929\u751f\u7f3a\u5931\u7684\u80fd\u529b\u3002<\/p>\n<\/blockquote>\n
    \u8981\u4e0d\u8981\u770b\u770b Lambda \u5e95\u5c42\u5230\u5e95\u662f\u600e\u4e48\u5b9e\u73b0\u7684\uff08\u7f16\u8bd1\u5668\u5176\u5b9e\u628a\u5b83\u8f6c\u6362\u6210\u4e86\u4e00\u4e2a\u4eff\u51fd\u6570\u7c7b<\/strong>\uff09\uff1f\u8fd9\u80fd\u8ba9\u4f60\u5f7b\u5e95\u7406\u89e3\u4e3a\u4ec0\u4e48\u5b83\u80fd”\u6355\u83b7”\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u8fd9\u662f\u4e2a\u5f88\u597d\u7684”\u5228\u6839\u95ee\u5e95&#8<\/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":[24],"tags":[],"class_list":["post-7429","post","type-post","status-publish","format-standard","hentry","category-value_docs"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/7429","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=7429"}],"version-history":[{"count":1,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/7429\/revisions"}],"predecessor-version":[{"id":7430,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/7429\/revisions\/7430"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=7429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=7429"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=7429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}