{"id":16951,"date":"2017-03-09T18:13:34","date_gmt":"2017-03-09T10:13:34","guid":{"rendered":"http:\/\/ityet.com\/?p=16951"},"modified":"2017-03-09T18:13:34","modified_gmt":"2017-03-09T10:13:34","slug":"swift%e5%86%85%e5%ad%98%e6%89%80%e6%9c%89%e6%9d%83%e5%ae%a3%e8%a8%80","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=16951","title":{"rendered":"Swift\u5185\u5b58\u6240\u6709\u6743\u5ba3\u8a00"},"content":{"rendered":"<p>\t\t\t\t<a href=\"http:\/\/news.cnblogs.com\/n\/topic_465.htm\" title=\"swift\"><img decoding=\"async\" src=\"http:\/\/images0.cnblogs.com\/news_topic\/swift.png\" alt=\"Swift\u5185\u5b58\u6240\u6709\u6743\u5ba3\u8a00\"\/><\/a><\/p>\n<p>\u3000\u3000\u82f1\u6587\u539f\u6587\uff1a&nbsp;<a href=\"https:\/\/www.infoq.com\/news\/2017\/03\/swift-memory-ownership-model\">Swift Memory Ownership Manifesto<\/a><\/p>\n<p>\u3000\u3000<a href=\"https:\/\/www.infoq.com\/news\/2016\/08\/ahead-to-swift-4\">\u6839\u636e<\/a>Chris Lattner \u4ecb\u7ecd\uff0cSwift 4 \u7684\u4e3b\u8981\u76ee\u6807\u4e4b\u4e00\u5c31\u662f\u8981\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u4f3c\u4e8e Rust\/Cyclone \u7684\u5185\u5b58\u6240\u6709\u6743\u6a21\u578b\uff08Memory Ownership Model\uff09\u3002Chris Lattner \u662f Swift \u7684\u521b\u5efa\u8005\uff0c\u5728<a href=\"https:\/\/lists.swift.org\/pipermail\/swift-evolution\/Week-of-Mon-20170109\/030063.html\">\u8df3\u69fd<\/a>\u5230 Tesla \u4e4b\u524d\u66fe\u62c5\u4efb Swift \u56e2\u961f\u8d1f\u8d23\u4eba\u3002\u5728 Swift 4 \u5f53\u524d\u5df2\u8fdb\u5165\u7b2c\u4e8c\u9636\u6bb5\u7684\u60c5\u51b5\u4e0b\uff0cSwift \u56e2\u961f\u53d1\u5e03\u4e86\u4e00\u4e2a\u5ba3\u8a00\uff0c\u8be6\u7ec6\u9610\u660e\u4e86 Swift \u5185\u5b58\u6240\u6709\u6743\u7684\u5de5\u4f5c\u65b9\u5f0f\u3002<\/p>\n<p>\u3000\u3000Swift \u7f16\u8bd1\u5668\u4e3a\u786e\u5b9a\u6240\u6709\u6743\u8f6c\u6362\u7684\u65f6\u673a\uff0c\u5df2\u5b9e\u73b0\u4e86\u4e00\u79cd\u81ea\u5df1\u7684\u4e0d\u900f\u660e\u6240\u6709\u6743\u6a21\u578b\uff08\u5373 <a href=\"https:\/\/developer.apple.com\/library\/content\/documentation\/Swift\/Conceptual\/Swift_Programming_Language\/AutomaticReferenceCounting.html\">ARC<\/a>\uff09\u3002\u867d\u7136\u6240\u6709\u6743\u5728\u4e00\u4e9b\u60c5\u51b5\u4e0b\u662f\u5f88\u660e\u6670\u7684\uff0c\u4f46\u662f\u7f16\u8bd1\u5668\u4e5f\u4f1a\u5728\u4e00\u4e9b\u60c5\u51b5\u4e0b\u505a\u51fa\u9519\u8bef\u5047\u8bbe\uff0c\u8fdb\u800c\u5bfc\u81f4\u4e0d\u5fc5\u8981\u7684\u590d\u5236\u3002\u7b80\u800c\u8a00\u4e4b\uff0cSwift \u7684\u65b0\u5185\u5b58\u6240\u6709\u6743\u6a21\u578b\u4f7f\u5f97\u5185\u5b58\u590d\u5236\u5c3d\u53ef\u80fd\u5730\u5904\u4e8e\u5f00\u53d1\u4eba\u5458\u7684\u63a7\u5236\u4e4b\u4e0b\u3002\u5b9a\u4e49\u8be5\u6a21\u578b\u5728\u4e8e\u5c3d\u91cf\u514b\u670d\u5f53\u524d\u5199\u65f6\u590d\u5236\uff08copy-on-write\uff09\u5728\u5f15\u7528\u8ba1\u6570\u65b9\u6cd5\u4e0a\u7684\u4e0d\u8db3\u4e4b\u5904\uff0c\u5305\u62ec\uff1a\u5f15\u7528\u8ba1\u6570\u7684\u5f00\u9500\u53ca\u6027\u80fd\u5076\u5c14\u65e0\u6cd5\u9884\u6d4b\uff0c\u4ee5\u53ca\u4e3a\u5b9e\u73b0\u968f\u65f6\u53ef\u590d\u5236\u7684\u9700\u6c42\u800c\u7b3c\u7edf\u5730\u5206\u914d\u5806\u5185\u5b58\u3002<\/p>\n<p>\u3000\u3000\u867d\u7136\u8fd9\u4e9b\u7f3a\u70b9\u901a\u5e38\u5bf9\u4e8e\u5e94\u7528\u7f16\u7a0b\u5e76\u4e0d\u4f1a\u6784\u6210\u95ee\u9898\uff0c\u4f46\u662f\u5bf9\u4e8e\u90a3\u4e9b\u9700\u8981\u4e00\u5b9a\u6027\u80fd\u4fdd\u8bc1\u7684\u7cfb\u7edf\u7f16\u7a0b\u800c\u8a00\u5374\u4e0d\u53d7\u6b22\u8fce\u3002\u6b64\u5916\uff0c\u66f4\u7075\u6d3b\u7684\u5185\u5b58\u7ba1\u7406\u6a21\u578b\u5177\u6709\u663e\u8457\u4f18\u70b9\uff0c\u8fd9\u4e9b\u4f18\u70b9\u540c\u6837\u9002\u7528\u4e8e\u5e94\u7528\u7f16\u7a0b\uff0c\u53bb\u89e3\u51b3\u7279\u5b9a\u74f6\u9888\u95ee\u9898\u7684\u4f18\u5316\u3002\u57fa\u4e8e\u4e0a\u8ff0\u539f\u56e0\uff0c\u4e0e ARC \u76f8\u6bd4\uff0c\u9009\u53d6 Swift \u7684\u65b0\u5185\u5b58\u6240\u6709\u6743\u6a21\u578b\u65e0\u7591\u4f1a\u66f4\u5177\u4f18\u52bf\uff0c\u53ea\u6709\u90a3\u4e9b\u5bf9\u66f4\u7ec6\u5316\u63a7\u5236\u6709\u9700\u6c42\u7684\u5f00\u53d1\u4eba\u5458\u624d\u9700\u8981\u627f\u62c5\u6a21\u578b\u7684\u590d\u6742\u6027\u4ee3\u4ef7\u3002<\/p>\n<p>\u3000\u3000&ldquo;\u72ec\u5360\u6027\u539f\u5219&rdquo;\uff08Law of Exclusivity\uff09\u4f1a\u5f71\u54cd\u5230\u6240\u6709\u7684 Swift \u5f00\u53d1\u4eba\u5458\uff0c\u8fd9\u4e00\u66f4\u6539\u5e76\u975e\u53ef\u9009\u62e9\u6dfb\u52a0\u7684\u3002\u5b83\u5f3a\u5236\u53d8\u91cf\u4e0d\u80fd\u4ee5\u51b2\u7a81\u7684\u65b9\u5f0f\u540c\u65f6\u8bbf\u95ee\uff0c\u5178\u578b\u60c5\u51b5\u5305\u62ec\u53d8\u91cf\u4f5c\u4e3a<code>inout<\/code>\u53c2\u6570\u4f20\u5165\u4e24\u4e2a\u4e0d\u540c\u51fd\u6570\uff0c\u4ee5\u53ca\u65b9\u6cd5\u6240\u63a5\u6536\u7684\u56de\u8c03\u8bbf\u95ee\u4e86\u65b9\u6cd5\u6240\u8c03\u7528\u7684\u540c\u4e00\u53d8\u91cf\u3002\u8fd9\u4e24\u79cd\u60c5\u51b5\u5f53\u524d\u5728 Swift \u4e2d\u662f\u5141\u8bb8\u7684\uff0c\u79fb\u9664\u4ed6\u4eec\u65e0\u7591\u5c06\u4f1a\u5f71\u54cd\u5230\u6240\u6709\u7684\u5f00\u53d1\u4eba\u5458\u3002\u6b64\u5916\uff0c\u72ec\u5360\u6027\u539f\u5219\u4f1a\u66f4\u6539\u5bf9\u53c2\u6570\u6240\u505a\u7684\u4fdd\u8bc1\uff0c\u8fdb\u800c\u5f71\u54cd\u5230\u8bed\u8a00\u7684\u5e94\u7528\u4e8c\u8fdb\u5236\u63a5\u53e3\uff08ABI\uff09\uff0c\u56e0\u6b64\u5b83\u4f1a\u6210\u4e3a\u88ab\u7387\u5148\u91c7\u7528\u7684\u7279\u6027\u4e4b\u4e00\u3002<\/p>\n<p>\u3000\u3000\u9664\u4e86\u72ec\u5360\u6027\u539f\u5219\u4e4b\u5916\uff0cSwift \u8fd8\u5c06\u5f15\u5165\u65b0\u7684\u6807\u6ce8\u548c\u8bed\u8a00\u7279\u6027\uff0c\u5141\u8bb8\u4f20\u9012\u5171\u4eab\u503c\u4ee5\u53ca\u8868\u8fbe\u65e0\u6cd5\u9690\u5f0f\u590d\u5236\u7684\u7c7b\u578b\u3002\u5ba3\u8a00\u7684\u4f5c\u8005\u6307\u51fa\u3002\u5728\u72ec\u5360\u6027\u3001\u663e\u793a\u63a7\u5236\u5171\u4eab\u503c\u4f20\u9012\u548c\u4e0d\u53ef\u590d\u5236\u7c7b\u578b\u8fd9\u4e09\u79cd\u673a\u5236\u7684\u5171\u540c\u4f5c\u7528\u4e0b\uff0c\u7f16\u8bd1\u5668\u53ef\u4ee5\u5bf9\u4ee3\u7801\u505a\u66f4\u597d\u7684\u4f18\u5316\u3002<\/p>\n<p>\u3000\u3000\u7b80\u800c\u8a00\u4e4b\uff0c\u53ef\u4ee5\u5c06\u65b0 Swift \u6240\u6709\u6743\u6a21\u578b\u7684\u9ad8\u5c42\u613f\u666f\u6982\u62ec\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\n<p>\u5982\u4e0a\u6240\u8ff0\uff0c\u7f16\u8bd1\u5668\u5c06\u4f1a\u6807\u6ce8\u6240\u6709\u975e\u72ec\u5360\u6027\u4f7f\u7528\u7684<code>inout<\/code>\u53c2\u6570\uff0c\u65e0\u8bba\u662f\u663e\u5f0f\u7684\u8fd8\u662f\u9690\u5f0f\u7684\u3002<\/p>\n<\/li>\n<li>\n<p>\u5f00\u53d1\u4eba\u5458\u5c06\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf\u662f\u5177\u6709\u6240\u6709\u6743\u7684\u8fd8\u662f\u5171\u4eab\u7684\uff0c\u4ee5\u907f\u514d\u5728\u8fdb\u5165\u6216\u79bb\u5f00\u8bcd\u6cd5\u4f5c\u7528\u57df\u65f6\u5f15\u7528\u8ba1\u6570\u548c\u505a\u4e0d\u5fc5\u8981\u7684\u62f7\u8d1d\/\u9500\u6bc1\u3002<\/p>\n<\/li>\n<li>\n<p>\u5f00\u53d1\u4eba\u5458\u5c06\u53ef\u4ee5\u5b9a\u4e49<code>moveonly<\/code>\uff08\u5373\u4e0d\u53ef\u62f7\u8d1d\uff09\u7c7b\u578b\uff0c\u8be5\u7c7b\u578b\u5bf9\u7f16\u8bd1\u5668\u4e0d\u53ef\u590d\u5236\uff0c\u4e5f\u4e0d\u80fd\u7528\u4e8e\u521b\u5efa\u66f4\u591a\u7684\u5f15\u7528\u3002<code>moveonly<\/code>\u7c7b\u578b\u5177\u6709 <a href=\"http:\/\/stackoverflow.com\/questions\/3106110\/what-are-move-semantics\">move \u8bed\u4e49<\/a>\uff0c\u88ab\u8ba4\u4e3a\u662f\u4e00\u79cd\u9ad8\u7ea7\u7279\u6027\u3002\u9664\u6b64\u4ee5\u5916\uff0c\u6240\u6709\u7c7b\u578b\u5c06\u9ed8\u8ba4\u662f\u53ef\u590d\u5236\u7684\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u3000\u3000\u5ba3\u8a00\u4e2d\u4e3a\u8fd9\u4e00\u6240\u6709\u6743\u6a21\u578b\u5b9a\u4e49\u6240\u8d4b\u4e88 Swift \u7684\u5168\u90e8\u7279\u6027\u7ed9\u51fa\u4e86\u957f\u7bc7\u7684\u548c\u8be6\u7ec6\u7684\u5206\u6790\uff0c\u5ba3\u8a00\u7684\u7ec6\u8282\u5185\u5bb9\u4ecd\u975e\u6700\u7ec8\u7248\u672c\u3002Swift \u5f00\u53d1\u4eba\u5458 Alexis Beingessner <a href=\"https:\/\/gist.github.com\/Gankro\/1f79fbf2a9776302a9d4c8c0097cc40e\">\u53d1\u5e03<\/a>\u4e86\u4e00\u7bc7\u66f4\u7b80\u77ed\u7684\u6587\u6863\uff0c\u627c\u8981\u5730\u6982\u62ec\u4e86\u5ba3\u8a00\u7684\u8981\u70b9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3000\u3000\u82f1\u6587\u539f\u6587\uff1a&nbsp;Swift Memory Ownership Manifesto \u3000\u3000\u6839\u636eChris [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-16951","post","type-post","status-publish","format-standard","hentry"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/16951","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16951"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/16951\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}