{"id":4136,"date":"2023-10-18T21:56:32","date_gmt":"2023-10-18T12:56:32","guid":{"rendered":"https:\/\/dennie.tokyo\/it\/?p=4136"},"modified":"2025-07-10T19:22:07","modified_gmt":"2025-07-10T10:22:07","slug":"%e3%80%90go%e3%80%91%e3%82%a8%e3%83%a9%e3%83%bc%e3%83%81%e3%82%a7%e3%83%bc%e3%83%b3","status":"publish","type":"post","link":"https:\/\/dennie.tokyo\/it\/?p=4136","title":{"rendered":"\u3010Go\u3011\u30a8\u30e9\u30fc\u30c1\u30a7\u30fc\u30f3"},"content":{"rendered":"\n

\u524d\u56de\u306f\u30a8\u30e9\u30fc\u306e\u30e9\u30c3\u30d4\u30f3\u30b0\u306b\u3064\u3044\u3066\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n\n\n\n\n

\u4eca\u56de\u306f\u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc\u3092\u4f5c\u6210\u3057\u3066\u3001\u305d\u306e\u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc\u304c\u30a8\u30e9\u30fc\u3092\u4fdd\u6301(\u30e9\u30c3\u30d4\u30f3\u30b0)\u3059\u308b\u3088\u3046\u306a\u30a8\u30e9\u30fc\u30c1\u30a7\u30fc\u30f3\u306b\u3064\u3044\u3066\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u3084\u308b\u3053\u3068<\/h1>\n\n\n\n

\u30a8\u30e9\u30fc\u3092\u4fdd\u6301\u3059\u308b\u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc<\/h2>\n\n\n\n

3\u3064\u306e\u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc(TopError\u3001MidError\u3001LowError)\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002
\u4f8b\u3048\u3070Top\u306e\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

type TopError struct {\n\terr error\n}\n\nfunc (t TopError) Error() string {\n\treturn "TopError\uff01\uff01"\n}<\/code><\/pre><\/div>\n\n\n\n
\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9<\/h2>\n\n\n\n
3\u3064\u306e\u69cb\u9020\u4f53(Top\u3001Mid\u3001Low)\u3092\u5b9a\u7fa9\u3057\u3066do\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002do\u30e1\u30bd\u30c3\u30c9\u306f\u4e0b\u5c64\u306e\u30a8\u30e9\u30fc\u3092\u4fdd\u6301\u3057\u3066\u30a8\u30e9\u30fc\u8fd4\u3057\u307e\u3059\u3002
Top\u306e\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
type Top struct {\n}\n\n\/\/ Mid\u306e\u30a8\u30e9\u30fc\u3092\u4fdd\u6301\u3057\u3066\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\nfunc (t *Top) do() error {\n\tm := Mid{}\n\treturn TopError{err: m.do()}\n}<\/code><\/pre><\/div>\n\n\n\n
\u968e\u5c64\u3068\u95a2\u4fc2<\/h2>\n\n\n\n
  1. main \u304c \u300cTop.do()\u30e1\u30bd\u30c3\u30c9\u5b9f\u884c\u300d<\/li>
  2. Top.do()\u30e1\u30bd\u30c3\u30c9 \u304c \u300cMid.do()\u30e1\u30bd\u30c3\u30c9\u5b9f\u884c\u300d<\/li>
  3. Mid.do()\u30e1\u30bd\u30c3\u30c9 \u304c \u300cLow.do()\u30e1\u30bd\u30c3\u30c9\u5b9f\u884c\u300d<\/li><\/ol>\n\n\n\n
    \u5404\u3005\u306e\u968e\u5c64\u3067\u4e0b\u5c64\u306e\u30a8\u30e9\u30fc\u3092\u4fdd\u6301\u3057\u3066\u30a8\u30e9\u30fc\u8fd4\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    \u5404\u5c64\u306e\u5b9f\u88c5<\/h1>\n\n\n\n
    \u6700\u4e0b\u5c64 – Low.go<\/h2>\n\n\n\n
    package main\n\ntype Low struct {\n}\n\nfunc (l *Low) do() error {\n\treturn LowError{}\n}\n\ntype LowError struct {\n}\n\nfunc (l LowError) Error() string {\n\treturn "LowError\uff01\uff01"\n}<\/code><\/pre><\/div>\n\n\n\n
    \u4e2d\u5c64 – Mid.go<\/h2>\n\n\n\n
    package main\n\ntype Mid struct {\n}\n\n\/\/ Low\u306e\u30a8\u30e9\u30fc\u3092\u4fdd\u6301\u3057\u3066\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\nfunc (m *Mid) do() error {\n\tl := Low{}\n\treturn MidError{err: l.do()}\n}\n\ntype MidError struct {\n\terr error\n}\n\nfunc (m MidError) Error() string {\n\treturn "MidError\uff01\uff01"\n}\n\nfunc (m MidError) Unwrap() error { \/\/ \u91cd\u8981\n\treturn m.err\n}<\/code><\/pre><\/div>\n\n\n\n
    \u6700\u4e0a\u5c64 – Top.go<\/h2>\n\n\n\n
    package main\n\ntype Top struct {\n}\n\n\/\/ Mid\u306e\u30a8\u30e9\u30fc\u3092\u4fdd\u6301\u3057\u3066\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\nfunc (t *Top) do() error {\n\tm := Mid{}\n\treturn TopError{err: m.do()}\n}\n\ntype TopError struct {\n\terr error\n}\n\nfunc (t TopError) Error() string {\n\treturn "TopError\uff01\uff01"\n}\n\nfunc (t TopError) Unwrap() error { \/\/ \u91cd\u8981\n\treturn t.err\n}<\/code><\/pre><\/div>\n\n\n\n
    \u30e1\u30a4\u30f3<\/h2>\n\n\n\n
    \u5404\u3005\u306e\u5c64\u306e\u30a8\u30e9\u30fc\u304c\u3042\u308b\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
    package main\n\nimport (\n\t"errors"\n\t"fmt"\n)\n\nfunc main() {\n\n\tt := Top{}\n\n\t\/\/ \u6700\u4e0b\u5c64\u306e\u30a8\u30e9\u30fc\u3092\u53d6\u5f97\u3059\u308b\n\tif errors.As(t.do(), &TopError{}) {\n\t\tfmt.Println("Top\u306e\u30a8\u30e9\u30fc\u304c\u3042\u3063\u305f\uff01\uff01")\n\t} else {\n\t\tfmt.Println("Top\u306e\u30a8\u30e9\u30fc\u306f\u306a\u3044\uff01\uff01")\n\t}\n\n\t\/\/ \u4e2d\u9593\u5c64\u306e\u30a8\u30e9\u30fc\u3092\u53d6\u5f97\u3059\u308b\n\tif errors.As(t.do(), &MidError{}) {\n\t\tfmt.Println("Mid\u306e\u30a8\u30e9\u30fc\u304c\u3042\u3063\u305f\uff01\uff01")\n\t} else {\n\t\tfmt.Println("Mid\u306e\u30a8\u30e9\u30fc\u306f\u306a\u3044\uff01\uff01")\n\t}\n\n\t\/\/ \u6700\u4e0a\u5c64\u306e\u30a8\u30e9\u30fc\u3092\u53d6\u5f97\u3059\u308b\n\tif errors.As(t.do(), &LowError{}) {\n\t\tfmt.Println("Low\u306e\u30a8\u30e9\u30fc\u304c\u3042\u3063\u305f\uff01\uff01")\n\t} else {\n\t\tfmt.Println("Low\u306e\u30a8\u30e9\u30fc\u306f\u306a\u3044\uff01\uff01")\n\t}\n}\n<\/code><\/pre><\/div>\n\n\n\n
    \u7d50\u679c\u3068\u30dd\u30a4\u30f3\u30c8<\/h1>\n\n\n\n
    \u7d50\u679c<\/h2>\n\n\n\n
    \u3061\u3083\u3093\u3068\u5224\u5b9a\u3057\u3066\u304f\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
    \u30dd\u30a4\u30f3\u30c8<\/h2>\n\n\n\n
    Unwrap\u95a2\u6570\u3092\u5b9f\u88c5\u3057\u306a\u3044\u3068errors.As\u95a2\u6570\u306f\u5224\u5b9a\u3057\u3066\u304f\u308c\u307e\u305b\u3093\u3002errors.As\u95a2\u6570\u306f\u7b2c\u4e00\u5f15\u6570\u306e\u30a8\u30e9\u30fc\u306eUnwrap\u95a2\u6570\u3092\u5b9f\u884c\u3057\u3001\u7b2c\u4e8c\u5f15\u6570(target\u3068\u547c\u79f0\u3059\u308b)\u306e\u30a8\u30e9\u30fc\u3068\u6bd4\u8f03\u3057\u307e\u3059\u3002\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u3001\u540c\u3058\u4e8b\u3092\u7e70\u308a\u8fd4\u3057\u307e\u3059\u3002\u306a\u306e\u3067\u3001\u5404\u968e\u5c64\u3067Unwrap\u95a2\u6570\u3092\u5b9f\u88c5\u3059\u308b\u4e8b\u3067errors.As\u95a2\u6570\u306ftarget\u306e\u30a8\u30e9\u30fc\u3068\u540c\u3058\u304b\u3069\u3046\u304b\u5224\u5b9a\u3057\u7d9a\u3051\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u524d\u56de\u306f\u30a8\u30e9\u30fc\u306e\u30e9\u30c3\u30d4\u30f3\u30b0\u306b\u3064\u3044\u3066\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"author":1,"featured_media":968,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[],"class_list":["post-4136","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-go"],"_links":{"self":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4136","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4136"}],"version-history":[{"count":10,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4136\/revisions"}],"predecessor-version":[{"id":4153,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4136\/revisions\/4153"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/media\/968"}],"wp:attachment":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4136"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4136"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4136"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}