{"rsdb":{"rid":"301595","subhead":"","postdate":"0","aid":"216871","fid":"78","uid":"1","topic":"1","content":"<div id=\"cnblogs_post_body\" class=\"blogpost-body cnblogs-markdown\">\n <div class=\"toc\"> \n  <p class=\"toc-title\">\u76ee\u5f55<\/p> \n  <div class=\"toc-list\"> \n   <ul> \n    <li><a>\u5f53\u6211\u4eec\u5728\u8bf4 slice \u65f6\uff0c\u5230\u5e95\u5728\u8bf4\u4ec0\u4e48<\/a><\/li> \n    <li><a>slice \u7684\u521b\u5efa<\/a>\n     <ul> \n      <li><a>\u76f4\u63a5\u58f0\u660e<\/a><\/li> \n      <li><a>\u5b57\u9762\u91cf<\/a><\/li> \n      <li><a>make<\/a><\/li> \n      <li><a>\u622a\u53d6<\/a><\/li> \n     <\/ul><\/li> \n    <li><a>slice \u548c\u6570\u7ec4\u7684\u533a\u522b\u5728\u54ea<\/a><\/li> \n    <li><a>append \u5230\u5e95\u505a\u4e86\u4ec0\u4e48<\/a><\/li> \n    <li><a>\u4e3a\u4ec0\u4e48 nil slice \u53ef\u4ee5\u76f4\u63a5 append<\/a><\/li> \n    <li><a>\u4f20 slice \u548c slice \u6307\u9488\u6709\u4ec0\u4e48\u533a\u522b<\/a><\/li> \n    <li><a>\u603b\u7ed3<\/a><\/li> \n    <li><a>\u53c2\u8003\u8d44\u6599<\/a><\/li> \n   <\/ul> \n  <\/div> \n <\/div> \n <p>Go \u8bed\u8a00\u7684 <code>slice<\/code> \u5f88\u597d\u7528\uff0c\u4e0d\u8fc7\u4e5f\u6709\u4e00\u4e9b\u5751\u3002<code>slice<\/code> \u662f Go \u8bed\u8a00\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u6570\u636e\u7ed3\u6784\u3002\u7f51\u4e0a\u5df2\u7ecf\u6709\u5f88\u591a\u6587\u7ae0\u5199\u8fc7\u4e86\uff0c\u4f3c\u4e4e\u6ca1\u5fc5\u8981\u518d\u5199\u3002\u4f46\u662f\u6bcf\u4e2a\u4eba\u770b\u95ee\u9898\u7684\u89c6\u89d2\u4e0d\u540c\uff0c\u5199\u51fa\u6765\u7684\u4e1c\u897f\u81ea\u7136\u4e5f\u4e0d\u4e00\u6837\u3002\u6211\u8fd9\u7bc7\u4f1a\u4ece\u66f4\u5e95\u5c42\u7684\u6c47\u7f16\u8bed\u8a00\u53bb\u89e3\u8bfb\u5b83\u3002\u800c\u4e14\u5728\u6211\u5199\u8fd9\u7bc7\u6587\u7ae0\u7684\u8fc7\u7a0b\u4e2d\uff0c\u53d1\u73b0\u7edd\u5927\u90e8\u5206\u6587\u7ae0\u90fd\u5b58\u5728\u4e00\u4e9b\u95ee\u9898\uff0c\u6587\u7ae0\u91cc\u4f1a\u8bb2\u5230\uff0c\u8fd9\u91cc\u5148\u4e0d\u5c55\u5f00\u3002<\/p> \n <p>\u6211\u5e0c\u671b\u672c\u6587\u53ef\u4ee5\u7ec8\u7ed3\u8fd9\u4e2a\u8bdd\u9898\uff0c\u4e0b\u6b21\u518d\u6709\u4eba\u60f3\u548c\u4f60\u8ba8\u8bba <code>slice<\/code>\uff0c\u76f4\u63a5\u628a\u8fd9\u7bc7\u6587\u7ae0\u7684\u94fe\u63a5\u4e22\u8fc7\u53bb\u5c31\u884c\u4e86\u3002<\/p> \n <h1 id=\"\u5f53\u6211\u4eec\u5728\u8bf4-slice-\u65f6\u5230\u5e95\u5728\u8bf4\u4ec0\u4e48\">\u5f53\u6211\u4eec\u5728\u8bf4 slice \u65f6\uff0c\u5230\u5e95\u5728\u8bf4\u4ec0\u4e48<\/h1> \n <p><code>slice<\/code> \u7ffb\u8bd1\u6210\u4e2d\u6587\u5c31\u662f<code>\u5207\u7247<\/code>\uff0c\u5b83\u548c<code>\u6570\u7ec4\uff08array\uff09<\/code>\u5f88\u7c7b\u4f3c\uff0c\u53ef\u4ee5\u7528\u4e0b\u6807\u7684\u65b9\u5f0f\u8fdb\u884c\u8bbf\u95ee\uff0c\u5982\u679c\u8d8a\u754c\uff0c\u5c31\u4f1a\u4ea7\u751f panic\u3002\u4f46\u662f\u5b83\u6bd4\u6570\u7ec4\u66f4\u7075\u6d3b\uff0c\u53ef\u4ee5\u81ea\u52a8\u5730\u8fdb\u884c\u6269\u5bb9\u3002<\/p> \n <p>\u4e86\u89e3 slice \u7684\u672c\u8d28\uff0c\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u5c31\u662f\u770b\u5b83\u7684\u6e90\u4ee3\u7801\uff1a<\/p> \n <pre class=\"golang\"><code>\/\/ runtime\/slice.go\ntype slice struct {\n    array unsafe.Pointer \/\/ \u5143\u7d20\u6307\u9488\n    len   int \/\/ \u957f\u5ea6 \n    cap   int \/\/ \u5bb9\u91cf\n}<\/code><\/pre> \n <p>\u770b\u5230\u4e86\u5417\uff0c<code>slice<\/code> \u5171\u6709\u4e09\u4e2a\u5c5e\u6027\uff1a<br \/> <code>\u6307\u9488<\/code>\uff0c\u6307\u5411\u5e95\u5c42\u6570\u7ec4\uff1b<br \/> <code>\u957f\u5ea6<\/code>\uff0c\u8868\u793a\u5207\u7247\u53ef\u7528\u5143\u7d20\u7684\u4e2a\u6570\uff0c\u4e5f\u5c31\u662f\u8bf4\u4f7f\u7528\u4e0b\u6807\u5bf9 slice \u7684\u5143\u7d20\u8fdb\u884c\u8bbf\u95ee\u65f6\uff0c\u4e0b\u6807\u4e0d\u80fd\u8d85\u8fc7 slice \u7684\u957f\u5ea6\uff1b<br \/> <code>\u5bb9\u91cf<\/code>\uff0c\u5e95\u5c42\u6570\u7ec4\u7684\u5143\u7d20\u4e2a\u6570\uff0c\u5bb9\u91cf &gt;= \u957f\u5ea6\u3002\u5728\u5e95\u5c42\u6570\u7ec4\u4e0d\u8fdb\u884c\u6269\u5bb9\u7684\u60c5\u51b5\u4e0b\uff0c\u5bb9\u91cf\u4e5f\u662f slice \u53ef\u4ee5\u6269\u5f20\u7684\u6700\u5927\u9650\u5ea6\u3002<\/p> \n <p><img src=\"https:\/\/user-images.githubusercontent.com\/7698088\/55270142-876c2000-52d6-11e9-99e5-2e921fc2d430.png\" alt=\"\u5207\u7247\u6570\u636e\u7ed3\u6784\" \/><\/p> \n <p>\u6ce8\u610f\uff0c\u5e95\u5c42\u6570\u7ec4\u662f\u53ef\u4ee5\u88ab\u591a\u4e2a slice \u540c\u65f6\u6307\u5411\u7684\uff0c\u56e0\u6b64\u5bf9\u4e00\u4e2a slice \u7684\u5143\u7d20\u8fdb\u884c\u64cd\u4f5c\u662f\u6709\u53ef\u80fd\u5f71\u54cd\u5230\u5176\u4ed6 slice \u7684\u3002<\/p> \n <h1 id=\"slice-\u7684\u521b\u5efa\">slice \u7684\u521b\u5efa<\/h1> \n <p>\u521b\u5efa slice \u7684\u65b9\u5f0f\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a<\/p> \n <table> \n  <thead> \n   <tr class=\"header\"> \n    <th>\u5e8f\u53f7<\/th> \n    <th>\u65b9\u5f0f<\/th> \n    <th>\u4ee3\u7801\u793a\u4f8b<\/th> \n   <\/tr> \n  <\/thead> \n  <tbody> \n   <tr class=\"odd\"> \n    <td>1<\/td> \n    <td>\u76f4\u63a5\u58f0\u660e<\/td> \n    <td><code>var slice []int<\/code><\/td> \n   <\/tr> \n   <tr class=\"even\"> \n    <td>2<\/td> \n    <td>new<\/td> \n    <td><code>slice := *new([]int)<\/code><\/td> \n   <\/tr> \n   <tr class=\"odd\"> \n    <td>3<\/td> \n    <td>\u5b57\u9762\u91cf<\/td> \n    <td><code>slice := []int{1,2,3,4,5}<\/code><\/td> \n   <\/tr> \n   <tr class=\"even\"> \n    <td>4<\/td> \n    <td>make<\/td> \n    <td><code>slice := make([]int, 5, 10)<\/code><\/td> \n   <\/tr> \n   <tr class=\"odd\"> \n    <td>5<\/td> \n    <td>\u4ece\u5207\u7247\u6216\u6570\u7ec4\u201c\u622a\u53d6\u201d<\/td> \n    <td><code>slice := array[1:5]<\/code> \u6216 <code>slice := sourceSlice[1:5]<\/code><\/td> \n   <\/tr> \n  <\/tbody> \n <\/table> \n <h2 id=\"\u76f4\u63a5\u58f0\u660e\">\u76f4\u63a5\u58f0\u660e<\/h2> \n <p>\u7b2c\u4e00\u79cd\u521b\u5efa\u51fa\u6765\u7684 slice \u5176\u5b9e\u662f\u4e00\u4e2a <code>nil slice<\/code>\u3002\u5b83\u7684\u957f\u5ea6\u548c\u5bb9\u91cf\u90fd\u4e3a0\u3002\u548c<code>nil<\/code>\u6bd4\u8f83\u7684\u7ed3\u679c\u4e3a<code>true<\/code>\u3002<\/p> \n <p>\u8fd9\u91cc\u6bd4\u8f83\u6df7\u6dc6\u7684\u662f<code>empty slice<\/code>\uff0c\u5b83\u7684\u957f\u5ea6\u548c\u5bb9\u91cf\u4e5f\u90fd\u4e3a0\uff0c\u4f46\u662f\u6240\u6709\u7684\u7a7a\u5207\u7247\u7684\u6570\u636e\u6307\u9488\u90fd\u6307\u5411\u540c\u4e00\u4e2a\u5730\u5740 <code>0xc42003bda0<\/code>\u3002\u7a7a\u5207\u7247\u548c <code>nil<\/code> \u6bd4\u8f83\u7684\u7ed3\u679c\u4e3a<code>false<\/code>\u3002<\/p> \n <p>\u5b83\u4eec\u7684\u5185\u90e8\u7ed3\u6784\u5982\u4e0b\u56fe\uff1a<\/p> \n <p><img src=\"https:\/\/user-images.githubusercontent.com\/7698088\/54864985-ac720780-4d99-11e9-8386-68ef68880c8d.png\" alt=\"nil slice \u4e0e empty slice\" \/><\/p> \n <table> \n  <thead> \n   <tr class=\"header\"> \n    <th>\u521b\u5efa\u65b9\u5f0f<\/th> \n    <th>nil\u5207\u7247<\/th> \n    <th>\u7a7a\u5207\u7247<\/th> \n   <\/tr> \n  <\/thead> \n  <tbody> \n   <tr class=\"odd\"> \n    <td>\u65b9\u5f0f\u4e00<\/td> \n    <td>var s1 []int<\/td> \n    <td>var s2 = []int{}<\/td> \n   <\/tr> \n   <tr class=\"even\"> \n    <td>\u65b9\u5f0f\u4e8c<\/td> \n    <td>var s4 = *new([]int)<\/td> \n    <td>var s3 = make([]int, 0)<\/td> \n   <\/tr> \n   <tr class=\"odd\"> \n    <td>\u957f\u5ea6<\/td> \n    <td>0<\/td> \n    <td>0<\/td> \n   <\/tr> \n   <tr class=\"even\"> \n    <td>\u5bb9\u91cf<\/td> \n    <td>0<\/td> \n    <td>0<\/td> \n   <\/tr> \n   <tr class=\"odd\"> \n    <td>\u548c <code>nil<\/code> \u6bd4\u8f83<\/td> \n    <td><code>true<\/code><\/td> \n    <td><code>false<\/code><\/td> \n   <\/tr> \n  <\/tbody> \n <\/table> \n <p><code>nil<\/code> \u5207\u7247\u548c\u7a7a\u5207\u7247\u5f88\u76f8\u4f3c\uff0c\u957f\u5ea6\u548c\u5bb9\u91cf\u90fd\u662f0\uff0c\u5b98\u65b9\u5efa\u8bae\u5c3d\u91cf\u4f7f\u7528 <code>nil<\/code> \u5207\u7247\u3002<\/p> \n <p>\u5173\u4e8e<code>nil slice<\/code>\u548c<code>empty slice<\/code>\u7684\u63a2\u7d22\u53ef\u4ee5\u53c2\u8003\u516c\u4f17\u53f7\u201c\u7801\u6d1e\u201d\u4f5c\u8005\u8001\u94b1\u5199\u7684\u4e00\u7bc7\u6587\u7ae0\u300a\u6df1\u5ea6\u89e3\u6790 Go \u8bed\u8a00\u4e2d\u300c\u5207\u7247\u300d\u7684\u4e09\u79cd\u7279\u6b8a\u72b6\u6001\u300b\uff0c\u5730\u5740\u9644\u5728\u4e86\u53c2\u8003\u8d44\u6599\u90e8\u5206\u3002<\/p> \n <h2 id=\"\u5b57\u9762\u91cf\">\u5b57\u9762\u91cf<\/h2> \n <p>\u6bd4\u8f83\u7b80\u5355\uff0c\u76f4\u63a5\u7528<code>\u521d\u59cb\u5316\u8868\u8fbe\u5f0f<\/code>\u521b\u5efa\u3002<\/p> \n <pre class=\"golang\"><code>package main\n\nimport &quot;fmt&quot;\n\nfunc main() {\n    s1 := []int{0, 1, 2, 3, 8: 100}\n    fmt.Println(s1, len(s1), cap(s1))\n}<\/code><\/pre> \n <p>\u8fd0\u884c\u7ed3\u679c\uff1a<\/p> \n <pre class=\"shell\"><code>[0 1 2 3 0 0 0 0 100] 9 9<\/code><\/pre> \n <p>\u552f\u4e00\u503c\u5f97\u6ce8\u610f\u7684\u662f\u4e0a\u9762\u7684\u4ee3\u7801\u4f8b\u5b50\u4e2d\u4f7f\u7528\u4e86\u7d22\u5f15\u53f7\uff0c\u76f4\u63a5\u8d4b\u503c\uff0c\u8fd9\u6837\uff0c\u5176\u4ed6\u672a\u6ce8\u660e\u7684\u5143\u7d20\u5219\u9ed8\u8ba4 <code>0 \u503c<\/code>\u3002<\/p> \n <h2 id=\"make\">make<\/h2> \n <p><code>make<\/code>\u51fd\u6570\u9700\u8981\u4f20\u5165\u4e09\u4e2a\u53c2\u6570\uff1a\u5207\u7247\u7c7b\u578b\uff0c\u957f\u5ea6\uff0c\u5bb9\u91cf\u3002\u5f53\u7136\uff0c\u5bb9\u91cf\u53ef\u4ee5\u4e0d\u4f20\uff0c\u9ed8\u8ba4\u548c\u957f\u5ea6\u76f8\u7b49\u3002<\/p> \n <p>\u4e0a\u7bc7\u6587\u7ae0<a>\u300a\u8d70\u8fdbGo\u7684\u5e95\u5c42\u300b<\/a>\u4e2d\uff0c\u6211\u4eec\u5b66\u5230\u4e86\u6c47\u7f16\u8fd9\u4e2a\u5de5\u5177\uff0c\u8fd9\u6b21\u6211\u4eec\u518d\u6b21\u8bf7\u51fa\u6c47\u7f16\u6765\u66f4\u6df1\u5165\u5730\u770b\u770b<code>slice<\/code>\u3002\u5982\u679c\u6ca1\u770b\u8fc7\u4e0a\u7bc7\u6587\u7ae0\uff0c\u5efa\u8bae\u5148\u56de\u53bb\u770b\u5b8c\uff0c\u518d\u7ee7\u7eed\u9605\u8bfb\u672c\u6587\u6548\u679c\u66f4\u4f73\u3002<\/p> \n <p>\u5148\u6765\u4e00\u5c0f\u6bb5\u73a9\u5177\u4ee3\u7801\uff0c\u4f7f\u7528 <code>make<\/code> \u5173\u952e\u5b57\u521b\u5efa <code>slice<\/code>\uff1a<\/p> \n <pre class=\"golang\"><code>package main\n\nimport &quot;fmt&quot;\n\nfunc main() {\n    slice := make([]int, 5, 10) \/\/ \u957f\u5ea6\u4e3a5\uff0c\u5bb9\u91cf\u4e3a10\n    slice[2] = 2 \/\/ \u7d22\u5f15\u4e3a2\u7684\u5143\u7d20\u8d4b\u503c\u4e3a2\n    fmt.Println(slice)\n}<\/code><\/pre> \n <p>\u6267\u884c\u5982\u4e0b\u547d\u4ee4\uff0c\u5f97\u5230 Go \u6c47\u7f16\u4ee3\u7801\uff1a<\/p> \n <pre class=\"shell\"><code>go tool compile -S main.go<\/code><\/pre> \n <p>\u6211\u4eec\u53ea\u5173\u6ce8main\u51fd\u6570\uff1a<\/p> \n <pre class=\"asm\"><code>0x0000 00000 (main.go:5)TEXT    &quot;&quot;.main(SB), $96-0\n0x0000 00000 (main.go:5)MOVQ    (TLS), CX\n0x0009 00009 (main.go:5)CMPQ    SP, 16(CX)\n0x000d 00013 (main.go:5)JLS     228\n0x0013 00019 (main.go:5)SUBQ    $96, SP\n0x0017 00023 (main.go:5)MOVQ    BP, 88(SP)\n0x001c 00028 (main.go:5)LEAQ    88(SP), BP\n0x0021 00033 (main.go:5)FUNCDATA    $0, gclocals&middot;69c1753bd5f81501d95132d08af04464(SB)\n0x0021 00033 (main.go:5)FUNCDATA    $1, gclocals&middot;57cc5e9a024203768cbab1c731570886(SB)\n0x0021 00033 (main.go:5)LEAQ    type.int(SB), AX\n0x0028 00040 (main.go:6)MOVQ    AX, (SP)\n0x002c 00044 (main.go:6)MOVQ    $5, 8(SP)\n0x0035 00053 (main.go:6)MOVQ    $10, 16(SP)\n0x003e 00062 (main.go:6)PCDATA  $0, $0\n0x003e 00062 (main.go:6)CALL    runtime.makeslice(SB)\n0x0043 00067 (main.go:6)MOVQ    24(SP), AX\n0x0048 00072 (main.go:6)MOVQ    32(SP), CX\n0x004d 00077 (main.go:6)MOVQ    40(SP), DX\n0x0052 00082 (main.go:7)CMPQ    CX, $2\n0x0056 00086 (main.go:7)JLS     221\n0x005c 00092 (main.go:7)MOVQ    $2, 16(AX)\n0x0064 00100 (main.go:8)MOVQ    AX, &quot;&quot;..autotmp_2+64(SP)\n0x0069 00105 (main.go:8)MOVQ    CX, &quot;&quot;..autotmp_2+72(SP)\n0x006e 00110 (main.go:8)MOVQ    DX, &quot;&quot;..autotmp_2+80(SP)\n0x0073 00115 (main.go:8)MOVQ    $0, &quot;&quot;..a","orderid":"0","title":"\u6df1\u5ea6\u89e3\u5bc6Go\u8bed\u8a00\u4e4bSlice(\u4e00)","smalltitle":"","mid":"0","fname":"GO","special_id":"0","bak_id":"0","info":"0","hits":"857","pages":"6","comments":"0","posttime":"2019-04-02 00:08:34","list":"1554134914","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/","ispic":"0","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"<A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%C9%EE%B6%C8' target=_blank>\u6df1\u5ea6<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%BD%E2%C3%DC' target=_blank>\u89e3\u5bc6<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%D3%EF%D1%D4' target=_blank>\u8bed\u8a00<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=Slice' target=_blank>Slice<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"47.106.78.186","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"\u6df1\u5ea6\u89e3\u5bc6Go\u8bed\u8a00\u4e4bSlice","lastview":"1714132409","digg_num":"0","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}