{"id":840,"date":"2022-10-19T11:17:13","date_gmt":"2022-10-19T03:17:13","guid":{"rendered":"https:\/\/courtship.top\/?p=840"},"modified":"2022-10-19T11:17:13","modified_gmt":"2022-10-19T03:17:13","slug":"vector-at","status":"publish","type":"post","link":"https:\/\/courtship.top\/index.php\/2022\/10\/19\/vector-at\/","title":{"rendered":"vector.at()"},"content":{"rendered":"\n<p>\u901a\u5e38\u6765\u8bf4\uff0c\u5047\u8bbev\u662f\u4e00\u4e2avector\u5bf9\u8c61\uff0c\u5219v.at(n)\u548cv[n]\u662f\u4e00\u6837\u7684\uff0c\u53ea\u4e0d\u8fc7\u524d\u8005\u4f1a\u68c0\u67e5\u662f\u5426\u8d8a\u754c\uff08\u56e0\u6b64\u82b1\u8d39\u7684\u65f6\u95f4\u7a0d\u591a\uff09\uff0c\u800c\u540e\u8005\u4e0d\u4f1a\uff08\u540e\u8005\u8d8a\u754c\u4f1a\u5bfc\u81f4\u672a\u5b9a\u4e49\u884c\u4e3a\uff09\u3002<\/p>\n\n\n\n<p>\u5177\u4f53\u800c\u8a00\uff0cvector&lt;T&gt;\uff08T\u662f\u67d0\u79cd\u7c7b\u578b\uff09\u7684at\u51fd\u6570\u63a5\u53d7\u4e00\u4e2avector&lt;T&gt;::size_type\u7c7b\u578b\u7684\u53c2\u6570n\uff08\u4e00\u79cd\u65e0\u7b26\u53f7\u6574\u578b\u7c7b\u578b\uff09\uff0c\u8fd4\u56de\u5bb9\u5668\u4f4d\u7f6e\u4e3an\u7684\u5143\u7d20\u7684\u5f15\u7528\uff08\u6ce8\u610f\u7b2c\u4e00\u4e2a\u4f4d\u7f6e\u4e3a0\uff09\u3002\u51fd\u6570\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\uff0c\u5373\u5e38\u6570\u65f6\u95f4\u3002\u5982\u679cn\u8d8a\u754c\uff0c\u4f1a\u629b\u51faout_of_range\u5f02\u5e38\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ vector::at\n#include &lt;iostream&gt;\n#include &lt;vector&gt;\n\nint main ()\n{\n  std::vector&lt;int&gt; myvector (10);   \/\/ 10 zero-initialized ints\n\n  \/\/ assign some values:\n  for (unsigned i=0; i&lt;myvector.size(); i++)\n    myvector.at(i)=i;\n\n  std::cout &lt;&lt; \"myvector contains:\";\n  for (unsigned i=0; i&lt;myvector.size(); i++)\n    std::cout &lt;&lt; ' ' &lt;&lt; myvector.at(i);\n  std::cout &lt;&lt; '\\n';\n\n  return 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u901a\u5e38\u6765\u8bf4\uff0c\u5047\u8bbev\u662f\u4e00\u4e2avector\u5bf9\u8c61\uff0c\u5219v.at(n)\u548cv[n]\u662f\u4e00\u6837\u7684\uff0c\u53ea\u4e0d\u8fc7\u524d\u8005\u4f1a\u68c0\u67e5\u662f\u5426\u8d8a\u754c\uff08\u56e0\u6b64\u82b1\u8d39\u7684\u65f6\u95f4\u7a0d\u591a\uff09\uff0c\u800c\u540e\u8005 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[22],"tags":[],"class_list":["post-840","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts\/840","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/comments?post=840"}],"version-history":[{"count":0,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts\/840\/revisions"}],"wp:attachment":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/media?parent=840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/categories?post=840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/tags?post=840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}