{"id":10006403,"date":"2022-09-06T01:10:38","date_gmt":"2022-09-05T17:10:38","guid":{"rendered":"https:\/\/ityet.com\/?p=10006403"},"modified":"2022-09-06T01:10:38","modified_gmt":"2022-09-05T17:10:38","slug":"%e5%af%b9-go2-%e9%94%99%e8%af%af%e5%a4%84%e7%90%86%e6%8f%90%e6%a1%88%e7%9a%84%e6%89%b9%e5%88%a4","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006403","title":{"rendered":"\u5bf9 Go2 \u9519\u8bef\u5904\u7406\u63d0\u6848\u7684\u6279\u5224"},"content":{"rendered":"

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

\u4e00\u5e74\u534a\u524d\u5206\u4eab\u4e86\u300a\u5148\u7779\u4e3a\u5feb\uff0cGo2 Error \u7684\u6323\u624e\u4e4b\u8def<\/a>\u300b\u7684\u6587\u7ae0\uff0c\u5185\u5bb9\u6d89\u53ca Go1 \u9519\u8bef\u5904\u7406\u7684\u95ee\u9898\u3001Go1.13 \u7684\u52a0\u5f3a\u3001Go2 \u7684\u65b0\u9519\u8bef\u5904\u7406\u63d0\u6848\u7684\u8be6\u89e3\u3002\u6709\u591a\u5c11\u5c0f\u4f19\u4f34\u8fd8\u8bb0\u5f97 Go2 \u7684\u65b0\u9519\u8bef\u63d0\u6848\u7684 \u201c\u7f8e\u597d\u201d \u672a\u6765\uff1f<\/p>\n

\u5f53\u65f6 Go2 \u7684\u65b0\u63d0\u6848\u4e5f\u906d\u53d7\u5230\u4e86\u4e0d\u5c11\u6279\u8bc4\uff0c@Liam Breck \u5728\u300aGolang, how dare you handle my checks!\u300b\u4e2d\u5bf9\u6b64\u8fdb\u884c\u4e86\u6279\u5224\uff0c\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u5b66\u4e60\u5427\uff01<\/p>\n

\u590d\u4e60\u8bed\u6cd5<\/h2>\n

\u5728 2018 \u5e74 8 \u6708\uff0c\u5b98\u65b9\u6b63\u5f0f\u516c\u5e03\u4e86 Go 2 Draft Designs<\/a>\uff0c\u5176\u4e2d\u5305\u542b\u6cdb\u578b\u548c\u9519\u8bef\u5904\u7406\u673a\u5236\u6539\u8fdb\u7684\u521d\u6b65\u8349\u6848\uff1a<\/p>\n

\"Go<\/p>\n

\u4e0b\u9762\u662f\u5173\u952e\u7684 Go2 \u9519\u8bef\u5904\u7406\u65b0\u8bed\u6cd5\u3002<\/p>\n

\u9519\u8bef\u5904\u7406\uff08Error Handling\uff09<\/h3>\n

\u7b2c\u4e00\u4e2a\u8981\u89e3\u51b3\u7684\u95ee\u9898\u5c31\u662f\u5927\u91cf if err != nil<\/code> \u7684\u95ee\u9898\uff0c\u9488\u5bf9\u6b64\u63d0\u51fa\u4e86 Go2 error handling<\/a> \u7684\u8349\u6848\u8bbe\u8ba1\u3002<\/p>\n

\u7b80\u5355\u4f8b\u5b50\uff1a<\/p>\n

if err != nil {\n    return err\n}<\/code><\/pre>\n
\u4f18\u5316\u540e\u7684\u65b9\u6848\u5982\u4e0b\uff1a<\/p>\n
func CopyFile(src, dst string) error {\n    handle err {\n        return fmt.Errorf("copy %s %s: %v", src, dst, err)\n    }\n\n    r := check os.Open(src)\n    defer r.Close()\n\n    w := check os.Create(dst)\n    handle err {\n        w.Close()\n        os.Remove(dst) \/\/ (only if a check fails)\n    }\n\n    check io.Copy(w, r)\n    check w.Close()\n    return nil\n}<\/code><\/pre>\n
\u4e3b\u51fd\u6570\uff1a<\/p>\n
func main() {\n    handle err {\n        log.Fatal(err)\n    }\n\n    hex := check ioutil.ReadAll(os.Stdin)\n    data := check parseHexdump(string(hex))\n    os.Stdout.Write(data)\n}<\/code><\/pre>\n
\u8be5\u63d0\u6848\u5f15\u5165\u4e86\u4e24\u79cd\u65b0\u7684\u8bed\u6cd5\u5f62\u5f0f\uff0c\u9996\u5148\u662f check<\/code> \u5173\u952e\u5b57\uff0c\u5176\u53ef\u4ee5\u9009\u4e2d\u4e00\u4e2a\u8868\u8fbe\u5f0f check f(x, y, z)<\/code> \u6216 check err<\/code>\uff0c\u5176\u5c06\u4f1a\u6807\u8bc6\u8fd9\u662f\u4e00\u4e2a\u663e\u5f0f\u7684\u9519\u8bef\u68c0\u67e5\u3002<\/p>\n
\u5176\u6b21\u5f15\u5165\u4e86 handle<\/code> \u5173\u952e\u5b57\uff0c\u7528\u4e8e\u5b9a\u4e49\u9519\u8bef\u5904\u7406\u7a0b\u5e8f\u6d41\u8f6c\uff0c\u9010\u7ea7\u4e0a\u629b\uff0c\u4f9d\u6b64\u7c7b\u63a8\uff0c\u76f4\u5230\u5904\u7406\u7a0b\u5e8f\u6267\u884c return<\/code> \u8bed\u53e5\uff0c\u624d\u6b63\u5f0f\u7ed3\u675f\u3002<\/p>\n
\u9519\u8bef\u503c\u6253\u5370\uff08Error Printing\uff09<\/h3>\n
\u7b2c\u4e8c\u4e2a\u8981\u89e3\u51b3\u7684\u95ee\u9898\u662f\u9519\u8bef\u503c\uff08Error Values\uff09\u3001\u9519\u8bef\u68c0\u67e5\uff08Error Inspection\uff09\u7684\u95ee\u9898\uff0c\u5176\u5f15\u7533\u51fa\u9519\u8bef\u503c\u6253\u5370\uff08Error Printing\uff09\u7684\u95ee\u9898\uff0c\u4e5f\u53ef\u4ee5\u8ba4\u4e3a\u662f\u9519\u8bef\u683c\u5f0f\u5316\u7684\u4e0d\u4fbf\u5229\u3002<\/p>\n
\u5b98\u65b9\u9488\u5bf9\u6b64\u63d0\u51fa\u4e86\u63d0\u51fa\u4e86 Error Values<\/a> \u548c Error Printing<\/a> \u7684\u8349\u6848\u8bbe\u8ba1\u3002<\/p>\n
\u7b80\u5355\u4f8b\u5b50\u5982\u4e0b\uff1a<\/p>\n
if err != nil {\n    return fmt.Errorf("write users database: %v", err)\n}<\/code><\/pre>\n
\u4f18\u5316\u540e\u7684\u65b9\u6848\u5982\u4e0b\uff1a<\/p>\n
package errors\n\ntype Wrapper interface {\n    Unwrap() error\n}\n\nfunc Is(err, target error) bool\nfunc As(type E)(err error) (e E, ok bool)<\/code><\/pre>\n
\u8be5\u63d0\u6848\u589e\u52a0\u4e86\u9519\u8bef\u94fe\u7684 Wrapping Error \u6982\u5ff5\uff0c\u5e76\u540c\u65f6\u589e\u52a0 errors.Is<\/code> \u548c errors.As<\/code> \u7684\u65b9\u6cd5\uff0c\u4e0e\u524d\u9762\u8bf4\u5230\u7684 Go1.13 \u7684\u6539\u8fdb\u4e00\u81f4\uff0c\u4e0d\u518d\u8d58\u8ff0\u3002<\/p>\n
Go1.13 \u6ca1\u6709\u5b9e\u73b0 %+v<\/code> \u8f93\u51fa\u8c03\u7528\u5806\u6808\u7684\u9700\u6c42\uff08\u6ca1\u6709\u8c03\u7528\u6808\uff0c\u6392\u67e5\u95ee\u9898\u4f1a\u5f88\u82e6\u607c\uff09\uff0c\u56e0\u4e3a\u6b64\u4e3e\u4f1a\u7834\u574f Go1 \u517c\u5bb9\u6027\u548c\u4ea7\u751f\u4e00\u4e9b\u6027\u80fd\u95ee\u9898\uff0c\u5927\u6982\u4f1a\u5728 Go2 \u52a0\u5165\u3002<\/p>\n
\u5bf9\u63d0\u6848\u6279\u5224<\/h2>\n
\u76ee\u6807\u8f83\u4e3a\u6a21\u7cca<\/h3>\n
\u5728 Go2 \u65b0\u9519\u8bef\u5904\u7406\u7684\u63d0\u6848\u548c\u8349\u6848\u4e2d\uff0c@Liam Breck \u8ba4\u4e3a\u5176\u6ca1\u6709\u53bb\u8ba8\u8bba\u6839\u672c\u7684\u9700\u6c42\u3002\u4ec5\u6709\u4e00\u4e2a\u7b80\u77ed\u7684\u76ee\u6807\u90e8\u5206\uff0c\u5982\u4e0b\u56db\u70b9\uff1a<\/p>\n