{"id":57734,"date":"2024-10-10T20:43:14","date_gmt":"2024-10-10T12:43:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/57734\/"},"modified":"2024-10-10T20:43:15","modified_gmt":"2024-10-10T12:43:15","slug":"go%e6%95%99%e7%a8%8b-go-%e8%aa%9e%e8%a8%80-nil%ef%bc%9a%e7%a9%ba%e5%80%bc-%e9%9b%b6%e5%80%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/57734\/","title":{"rendered":"GO\u6559\u7a0b: Go \u8a9e\u8a00 nil\uff1a\u7a7a\u503c\/\u96f6\u503c"},"content":{"rendered":"

GO\u6559\u7a0b: Go \u8a9e\u8a00 nil\uff1a\u7a7a\u503c\/\u96f6\u503c<\/h1>\n

\u5728 Go \u8a9e\u8a00\u4e2d\uff0c\u7406\u89e3 nil \u7684\u6982\u5ff5\u5c0d\u65bc\u958b\u767c\u8005\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\u3002nil \u662f\u4e00\u500b\u7279\u6b8a\u7684\u503c\uff0c\u8868\u793a\u201c\u7121\u201d\u6216\u201c\u7a7a\u201d\u3002\u9019\u500b\u6982\u5ff5\u5728\u8655\u7406\u6307\u91dd\u3001\u5207\u7247\u3001\u6620\u5c04\u3001\u901a\u9053\u7b49\u6578\u64da\u7d50\u69cb\u6642\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e Go \u8a9e\u8a00\u4e2d\u7684 nil\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u4f86\u5e6b\u52a9\u7406\u89e3\u3002<\/p>\n

1. nil \u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u5728 Go \u8a9e\u8a00\u4e2d\uff0cnil \u662f\u4e00\u500b\u9810\u8a2d\u503c\uff0c\u8868\u793a\u4e00\u500b\u8b8a\u91cf\u4e0d\u6307\u5411\u4efb\u4f55\u6709\u6548\u7684\u5167\u5b58\u5730\u5740\u3002\u9019\u610f\u5473\u8457 nil \u53ef\u4ee5\u7528\u65bc\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u5305\u62ec\u6307\u91dd\u3001\u5207\u7247\u3001\u6620\u5c04\u3001\u901a\u9053\u548c\u63a5\u53e3\u3002\u7576\u4e00\u500b\u8b8a\u91cf\u88ab\u521d\u59cb\u5316\u4f46\u672a\u88ab\u8ce6\u503c\u6642\uff0c\u5b83\u7684\u503c\u5c31\u662f nil\u3002<\/p>\n

2. nil \u5728\u4e0d\u540c\u6578\u64da\u985e\u578b\u4e2d\u7684\u61c9\u7528<\/h2>\n

2.1 \u6307\u91dd<\/h3>\n

\u6307\u91dd\u662f\u4e00\u7a2e\u8b8a\u91cf\uff0c\u5b58\u5132\u53e6\u4e00\u500b\u8b8a\u91cf\u7684\u5167\u5b58\u5730\u5740\u3002\u7576\u6307\u91dd\u672a\u88ab\u521d\u59cb\u5316\u6642\uff0c\u5176\u503c\u70ba nil\u3002<\/p>\n

package main\n\nimport \"fmt\"\n\nfunc main() {\n    var p *int\n    if p == nil {\n        fmt.Println(\"\u6307\u91dd p \u662f nil\")\n    }\n}\n<\/code><\/pre>\n
2.2 \u5207\u7247<\/h3>\n
\u5207\u7247\u662f\u4e00\u7a2e\u52d5\u614b\u6578\u7d44\uff0c\u7576\u5207\u7247\u672a\u88ab\u521d\u59cb\u5316\u6642\uff0c\u5176\u503c\u4e5f\u70ba nil\u3002<\/p>\n
package main\n\nimport \"fmt\"\n\nfunc main() {\n    var s []int\n    if s == nil {\n        fmt.Println(\"\u5207\u7247 s \u662f nil\")\n    }\n}\n<\/code><\/pre>\n
2.3 \u6620\u5c04<\/h3>\n
\u6620\u5c04\u662f\u4e00\u7a2e\u7121\u5e8f\u7684\u9375\u503c\u5c0d\u96c6\u5408\uff0c\u7576\u6620\u5c04\u672a\u88ab\u521d\u59cb\u5316\u6642\uff0c\u5176\u503c\u70ba nil\u3002<\/p>\n
package main\n\nimport \"fmt\"\n\nfunc main() {\n    var m map[string]int\n    if m == nil {\n        fmt.Println(\"\u6620\u5c04 m \u662f nil\")\n    }\n}\n<\/code><\/pre>\n
2.4 \u901a\u9053<\/h3>\n
\u901a\u9053\u7528\u65bc\u5728 goroutine \u4e4b\u9593\u50b3\u905e\u6578\u64da\uff0c\u7576\u901a\u9053\u672a\u88ab\u521d\u59cb\u5316\u6642\uff0c\u5176\u503c\u70ba nil\u3002<\/p>\n
package main\n\nimport \"fmt\"\n\nfunc main() {\n    var ch chan int\n    if ch == nil {\n        fmt.Println(\"\u901a\u9053 ch \u662f nil\")\n    }\n}\n<\/code><\/pre>\n
2.5 \u63a5\u53e3<\/h3>\n
\u63a5\u53e3\u662f\u4e00\u7a2e\u62bd\u8c61\u985e\u578b\uff0c\u7576\u63a5\u53e3\u672a\u88ab\u8ce6\u503c\u6642\uff0c\u5176\u503c\u70ba nil\u3002<\/p>\n
package main\n\nimport \"fmt\"\n\ntype Animal interface {\n    Speak() string\n}\n\nfunc main() {\n    var a Animal\n    if a == nil {\n        fmt.Println(\"\u63a5\u53e3 a \u662f nil\")\n    }\n}\n<\/code><\/pre>\n
3. nil \u7684\u4f7f\u7528\u6ce8\u610f\u4e8b\u9805<\/h2>\n
\u5728\u4f7f\u7528 nil \u6642\uff0c\u958b\u767c\u8005\u9700\u8981\u7279\u5225\u5c0f\u5fc3\u3002\u5c0d\u65bc nil \u7684\u64cd\u4f5c\u53ef\u80fd\u6703\u5c0e\u81f4\u904b\u884c\u6642\u932f\u8aa4\u3002\u4f8b\u5982\uff0c\u5c0d nil \u6307\u91dd\u9032\u884c\u89e3\u5f15\u7528\u6703\u5f15\u767c panic\u3002<\/p>\n
package main\n\nimport \"fmt\"\n\nfunc main() {\n    var p *int\n    \/\/ \u5c0d nil \u6307\u91dd\u9032\u884c\u89e3\u5f15\u7528\u6703\u5f15\u767c panic\n    \/\/ fmt.Println(*p) \/\/ \u9019\u884c\u4ee3\u78bc\u6703\u5c0e\u81f4\u904b\u884c\u6642\u932f\u8aa4\n}\n<\/code><\/pre>\n
\u56e0\u6b64\uff0c\u5728\u4f7f\u7528\u6307\u91dd\u6216\u5176\u4ed6\u53ef\u80fd\u70ba nil \u7684\u6578\u64da\u985e\u578b\u6642\uff0c\u61c9\u8a72\u59cb\u7d42\u6aa2\u67e5\u5176\u662f\u5426\u70ba nil\uff0c\u4ee5\u907f\u514d\u6f5b\u5728\u7684\u932f\u8aa4\u3002<\/p>\n
4. \u7e3d\u7d50<\/h2>\n
nil \u5728 Go \u8a9e\u8a00\u4e2d\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u7406\u89e3\u5176\u5728\u4e0d\u540c\u6578\u64da\u985e\u578b\u4e2d\u7684\u61c9\u7528\u5c0d\u65bc\u7de8\u5beb\u5065\u58ef\u7684\u4ee3\u78bc\u81f3\u95dc\u91cd\u8981\u3002\u958b\u767c\u8005\u61c9\u8a72\u719f\u6089 nil \u7684\u7279\u6027\uff0c\u4e26\u5728\u4f7f\u7528\u6307\u91dd\u3001\u5207\u7247\u3001\u6620\u5c04\u3001\u901a\u9053\u548c\u63a5\u53e3\u6642\u4fdd\u6301\u8b39\u614e\u3002\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u907f\u514d\u904b\u884c\u6642\u932f\u8aa4\uff0c\u63d0\u5347\u4ee3\u78bc\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u6709\u8208\u8da3\uff0c\u6216\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc \u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3 Go \u8a9e\u8a00\u4e2d\u7684 nil \u6982\u5ff5\uff0c\u63a2\u7d22\u7a7a\u503c\u548c\u96f6\u503c\u7684\u7528\u6cd5\u53ca\u5176\u5728\u7a0b\u5f0f\u8a2d\u8a08\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-57734","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57734","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=57734"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57734\/revisions"}],"predecessor-version":[{"id":57735,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57734\/revisions\/57735"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=57734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=57734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=57734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}