{"id":10006708,"date":"2022-10-20T14:27:55","date_gmt":"2022-10-20T06:27:55","guid":{"rendered":"https:\/\/ityet.com\/?p=10006708"},"modified":"2022-10-20T14:27:55","modified_gmt":"2022-10-20T06:27:55","slug":"%e7%94%a8-go-interface-%e7%ad%89%e4%ba%8e%e4%bb%80%e4%b9%88%e4%b9%9f%e6%b2%a1%e8%af%b4","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006708","title":{"rendered":"\u7528 Go interface{} \u7b49\u4e8e\u4ec0\u4e48\u4e5f\u6ca1\u8bf4"},"content":{"rendered":"

\u5927\u5bb6\u597d\uff0c\u6211\u662f\u714e\u9c7c\u3002<\/p>\n

\u5982\u679c\u8bf4\u5728 Go \u91cc\u8981\u6709\u4e00\u53e5\u4e0e interface{} \u76f8\u5173\uff0c\u4f60\u4f1a\u60f3\u5230\u4ec0\u4e48\uff1f\u662f\u4e07\u7269\u7686\u8981\u5b9a\u4e49 interface\uff0c\u5426\u5219\u6ca1\u6cd5\u62bd\u8c61\uff1f<\/p>\n

Go \u8c1a\u8bed\u4e2d\u8ba4\u53ef\u7684\u662f\uff1a”interface{} says nothing”\uff0c\u4e5f\u5c31\u662f interface{} \u4ec0\u4e48\u4e5f\u6ca1\u8bf4\u3002\u8fd9\u6307\u7684\u53c8\u4ec0\u4e48\uff0c\u592a\u9ed1\u8bdd\u4e86\u5427…<\/p>\n

\u4eca\u5929\u5c31\u714e\u9c7c\u548c\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u3002<\/p>\n

\u63a5\u53e3\u7c7b\u578b\u65e0\u81ea\u63cf\u8ff0<\/h2>\n

interface{} \u7684\u7b2c\u4e00\u79cd\u7528\u6cd5\uff0c\u90a3\u5c31\u662f\u53d8\u91cf\u7684\u6570\u636e\u7c7b\u578b\u58f0\u660e\u3002\u7ed3\u5408\u5176\u5b83\u8bed\u8a00\u6765\u770b\uff0c\u4e00\u5171\u6709\u5982\u4e0b\u51e0\u79cd\u5f62\u5f0f\uff1a<\/p>\n

let i:any = 1;          \/\/ Typescript\nstd::any i = 1;         \/\/ C++17\nObject i = 1;           \/\/ Java\nvar i interface{} = 1   \/\/ Go<\/code><\/pre>\n
Go \u5728 1.18 \u540e\uff0c\u4e5f\u652f\u6301\u4e86 any \u5173\u952e\u5b57\u7684\u58f0\u660e\u65b9\u6cd5\uff0c\u662f\u7c7b\u4f3c interface{} \u7684\u4f5c\u7528\uff0c\u5404\u8def\u8bed\u8a00\u90fd\u8d8b\u540c\u4e86\u3002<\/p>\n
\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\u9891\u7e41\u7684\u7528\u63a5\u53e3\uff08interface{}\uff09\u7c7b\u578b\u4f5c\u4e3a\u53d8\u91cf\u7684\u7c7b\u578b\u6709\u6ca1\u6709\u95ee\u9898\u5462\uff1f<\/p>\n
\u660e\u786e\u7684\u58f0\u660e<\/h3>\n
\u5f53\u6211\u4eec\u5728\u9605\u8bfb Go \u4ee3\u7801\u65f6\u3002\u5982\u679c\u6587\u6863\u3001\u547d\u540d\u3001\u3001\u53c2\u6570\uff08\u542b\u7c7b\u578b\uff09\u662f\u6e05\u6670\u7684\uff0c\u53ef\u9760\u7684\u3002\u6211\u4eec\u5927\u6982\u7387\u4f1a\u76f4\u63a5\u8c03\u7528\uff0c\u660e\u786e\u7684\u7c7b\u578b\u4f1a\u66f4\u8ba9\u6211\u4eec\u6709 \u201d\u5b89\u5168\u611f\u201c\uff0c\u77e5\u9053\u8981\u4f20\u4ec0\u4e48\u503c\u3002<\/p>\n
\u5982\u4e0b\u51fd\u6570\u7b7e\u540d\uff1a<\/p>\n
func Eat(v string) { ... }<\/code><\/pre>\n
\u5f53\u7136\u77e5\u9053\u8c03\u7528 Eat \u51fd\u6570\u8981\u4f20 string \u7c7b\u578b\u4e86\uff0c\u4e0d\u662f\u4f20\u4ec0\u4e48 int \u7c7b\u578b\u3002<\/p>\n
\u672a\u77e5\u7684\u58f0\u660e<\/h3>\n
\u5982\u679c\u4e00\u4e2a\u51fd\u6570\u7684\u53c2\u6570\u7684\u7c7b\u578b\u662f interface{}\uff0c\u6211\u4eec\u5c31\u4f1a\u8fdb\u51fd\u6570\u5185\u770b\u5176\u5177\u4f53\u7684\u5b9e\u73b0\uff0c\u4ee5\u6b64\u5bfb\u6c42\u786e\u5b9a\u6027\u3002<\/p>\n
\u5982\u4e0b\u51fd\u6570\u7b7e\u540d\uff1a<\/p>\n
func Eat(v interface{}) { ... }<\/code><\/pre>\n
\u8bf7\u95ee\u53d8\u91cf v \u5230\u5e95\u4f20\u4ec0\u4e48\uff0c\u4f20 int \u7c7b\u578b\uff0c\u8fd8\u662f string \u7c7b\u578b\uff0c\u53c8\u6216\u662f\u90fd\u53ef\u4ee5\uff1f<\/p>\n
\u6b63\u5982\u8c1a\u8bed\u4e2d\u6240\u8bf4\uff0c\u5b9a\u4e49\u4e86 interface{}\uff0c\u662f\u4ec0\u4e48\u90fd\u6ca1\u8bf4\uff0c\u663e\u7136\u662f \u201c\u4e0d\u5927\u597d\u7684\u5473\u9053\u201d\uff0c\u8fd9\u6837\u7684\u4ee3\u7801\u65e0\u6cd5\u81ea\u63cf\u8ff0\u3002\u7a0b\u5e8f\u5458\u5f97\u7ffb\u4ee3\u7801\u6216\u6587\u6863\uff08\u6587\u6863\u8fd8\u4e0d\u4e00\u5b9a\u66f4\u65b0\u7684\u53ca\u65f6\uff09\u3002<\/p>\n
\u6ce8\uff1a\u5728\u516c\u53f8\u771f\u89c1\u5230\u8fd9\u79cd\u573a\u666f\uff0c\u8be5\u4f4d\u540c\u5b66\u731c\u4e0d\u900f\uff0c\u5927\u547c\u7edd\u7edd\u5b50\uff0c\u7ffb\u4ee3\u7801\u53bb\u4e86\u3002<\/p>\n
\u5c0f\u63a5\u53e3\u4f18\u4e8e\u5927\u63a5\u53e3<\/h2>\n
\u5728\u4e1a\u5185\u5c0f\u800c\u96c6\u4e2d\u7684\u63a5\u53e3\u662f\u7f16\u5199\u5f3a\u5927\u800c\u7075\u6d3b\u7684 Go \u4ee3\u7801\u7684\u5173\u952e\u88ab\u5e7f\u6cdb\u8ba4\u53ef\u3002io \u6807\u51c6\u5e93\u4e2d\u7684 io.Reader \u548c io.Writer \u63a5\u53e3\u662f\u5b98\u65b9\u8ba4\u53ef\u7684\u6559\u79d1\u4e66\u5f0f\u6848\u4f8b\u3002<\/p>\n
io.Reader\uff1a<\/p>\n
type Reader interface {\n    Read(p []byte) (n int, err error)\n}<\/code><\/pre>\n
io.Writer\uff1a<\/p>\n
type Writer interface {\n    Write(p []byte) (n int, err error)\n}<\/code><\/pre>\n
\u5c0f\u63a5\u53e3\u4e0e\u5927\u63a5\u53e3\u76f8\u6bd4\uff0c\u7528\u6237\u8ba4\u77e5\u7684\u5fc3\u667a\u548c\u5b9e\u73b0\u6210\u672c\u8f83\u4f4e\u3002<\/p>\n
\u4ece\u73b0\u5b9e\u60c5\u51b5\u6765\u8bb2\uff0c\u5f53\u4e00\u4e2a Go \u4ee3\u7801\u5e93\u4e2d\u62e5\u6709 6 \u4e2a\uff0c\u751a\u81f3\u66f4\u591a\u7684\u5927\u578b\u63a5\u53e3\u5f80\u5f80\u53ea\u6709\u4e24\u79cd\u5b9e\u73b0\uff0c\u90a3\u5c31\u662f\u552f\u4e00\u7684\u5177\u4f53\u5b9e\u73b0\u548c\u4e00\u4e2a\u7528\u4e8e\u6d4b\u8bd5\u7684\u6a21\u62df\u5b9e\u73b0\u3002<\/p>\n
\u53e6\u5916 io.Reader \u548c io.Writer \u63a5\u53e3\u5e76\u4e0d\u662f\u524d\u671f\u8bbe\u8ba1\u7684\uff0c\u5b83\u4eec\u662f\u540e\u6765\u53d1\u73b0\u7684\u3002Network\u3001File \u548c\u5176\u4ed6\u5b57\u8282\u5904\u7406\u7c7b\u578b\u9700\u8981\u5171\u4eab\u7c7b\u4f3c\u7684\u5b9e\u73b0\u3002<\/p>\n
\u6240\u4ee5\u57fa\u4e8e\u8fd9\u4e9b\u76f8\u4f3c\u7684\u8bc9\u6c42\u4e2d\uff0cio.Reader \u548c io.Writer \u63a5\u53e3\u8bde\u751f\u4e86\u3002<\/p>\n
\u201c\u6700\u4f73\u5b9e\u8df5\u201d \u90fd\u662f\u5b9e\u8df5\u3001\u63a2\u7d22\u3001\u6f14\u53d8\u51fa\u6765\u7684\u3002<\/p>\n
\u603b\u7ed3<\/h2>\n
\u4eca\u5929\u6211\u4eec\u5bf9 Go \u8c1a\u8bed\u4e2d\u7684\uff1a”interface{} says nothing” \u8fdb\u884c\u4e86\u5927\u81f4\u7684\u4e86\u89e3\uff0c\u6838\u5fc3\u7684\u5b98\u65b9\u5efa\u8bae\u5728\u4e8e\uff1a<\/p>\n