{"id":64813,"date":"2026-01-24T07:24:15","date_gmt":"2026-01-23T23:24:15","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/64813.html"},"modified":"2026-01-24T07:24:15","modified_gmt":"2026-01-23T23:24:15","slug":"%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90c-vector%ef%bc%9a%e4%bb%8e%e4%b8%89%e6%8c%87%e9%92%88%e5%88%b0%e6%89%8b%e5%86%99%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/64813.html","title":{"rendered":"\u6df1\u5165\u89e3\u6790C++ vector\uff1a\u4ece\u4e09\u6307\u9488\u5230\u624b\u5199\u5b9e\u73b0"},"content":{"rendered":"<h4>\u63ed\u5f00 C&#043;&#043; vector \u5e95\u5c42\u9762\u7eb1&#xff1a;\u4ece\u4e09\u6307\u9488\u6a21\u578b\u5230\u624b\u5199\u5b8c\u6574\u5b9e\u73b0<\/h4>\n<p>C&#043;&#043; \u6807\u51c6\u5e93\u4e2d\u7684 vector \u662f\u4e00\u4e2a\u52a8\u6001\u6570\u7ec4\u5bb9\u5668&#xff0c;\u652f\u6301\u9ad8\u6548\u7684\u5143\u7d20\u8bbf\u95ee\u3001\u63d2\u5165\u548c\u5220\u9664\u3002\u5176\u5e95\u5c42\u5b9e\u73b0\u901a\u5e38\u91c7\u7528\u201c\u4e09\u6307\u9488\u6a21\u578b\u201d&#xff0c;\u8fd9\u662f\u4e00\u79cd\u7b80\u6d01\u4e14\u9ad8\u6548\u7684\u5185\u5b58\u7ba1\u7406\u65b9\u5f0f\u3002\u5728\u672c\u6559\u7a0b\u4e2d&#xff0c;\u6211\u5c06\u9010\u6b65\u63ed\u5f00 vector \u7684\u5185\u90e8\u673a\u5236&#xff0c;\u4ece\u89e3\u91ca\u4e09\u6307\u9488\u6a21\u578b\u5f00\u59cb&#xff0c;\u5230\u624b\u5199\u4e00\u4e2a\u5b8c\u6574\u7684\u7b80\u5316\u7248 vector \u5b9e\u73b0\u3002\u6574\u4e2a\u8fc7\u7a0b\u7ed3\u6784\u6e05\u6670&#xff0c;\u5e2e\u52a9\u60a8\u6df1\u5165\u7406\u89e3\u3002<\/p>\n<h5>1. \u4e09\u6307\u9488\u6a21\u578b\u8be6\u89e3<\/h5>\n<p>vector \u7684\u6838\u5fc3\u662f\u4e09\u4e2a\u6307\u9488&#xff0c;\u5b83\u4eec\u5171\u540c\u7ba1\u7406\u52a8\u6001\u6570\u7ec4\u7684\u5185\u5b58&#xff1a;<\/p>\n<ul>\n<li>start_&#xff1a;\u6307\u5411\u6570\u7ec4\u7684\u8d77\u59cb\u4f4d\u7f6e&#xff08;\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff09;\u3002<\/li>\n<li>finish_&#xff1a;\u6307\u5411\u6570\u7ec4\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u4e0b\u4e00\u4e2a\u4f4d\u7f6e&#xff08;\u5373\u6709\u6548\u5143\u7d20\u7684\u7ed3\u675f\u70b9&#xff09;\u3002\u5f53\u524d\u5143\u7d20\u6570\u91cf&#xff08;size&#xff09;\u53ef\u4ee5\u901a\u8fc7 $size &#061; \\\\text{finish_} &#8211; \\\\text{start_}$ \u8ba1\u7b97\u3002<\/li>\n<li>end_of_storage_&#xff1a;\u6307\u5411\u5206\u914d\u5185\u5b58\u7684\u7ed3\u675f\u4f4d\u7f6e&#xff08;\u5373\u5bb9\u91cf\u7684\u7ed3\u675f\u70b9&#xff09;\u3002\u5f53\u524d\u5bb9\u91cf&#xff08;capacity&#xff09;\u53ef\u4ee5\u901a\u8fc7 $capacity &#061; \\\\text{end_of_storage_} &#8211; \\\\text{start_}$ \u8ba1\u7b97\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e09\u4e2a\u6307\u9488\u786e\u4fdd\u4e86\u9ad8\u6548\u7684\u5185\u5b58\u7ba1\u7406&#xff1a;<\/p>\n<ul>\n<li>\u5f53\u63d2\u5165\u5143\u7d20\u65f6&#xff08;\u5982 push_back&#xff09;&#xff0c;\u5982\u679c\u7a7a\u95f4\u4e0d\u8db3&#xff08;$size \\\\geq capacity$&#xff09;&#xff0c;\u9700\u8981\u91cd\u65b0\u5206\u914d\u66f4\u5927\u7684\u5185\u5b58\u5757&#xff08;\u901a\u5e38\u52a0\u500d\u5bb9\u91cf&#xff09;&#xff0c;\u5e76\u590d\u5236\u539f\u6709\u5143\u7d20\u3002<\/li>\n<li>\u8fd9\u79cd\u6a21\u578b\u907f\u514d\u4e86\u6bcf\u6b21\u63d2\u5165\u90fd\u91cd\u65b0\u5206\u914d\u7684\u5f00\u9500&#xff0c;\u65f6\u95f4\u590d\u6742\u5ea6\u5e73\u5747\u4e3a $O(1)$\u3002<\/li>\n<\/ul>\n<h5>2. \u624b\u5199\u5b9e\u73b0\u6b65\u9aa4<\/h5>\n<p>\u73b0\u5728&#xff0c;\u6211\u4eec\u624b\u5199\u4e00\u4e2a\u7b80\u5316\u7248 Vector \u7c7b&#xff0c;\u6a21\u4eff\u6807\u51c6\u5e93\u7684 vector\u3002\u6211\u4eec\u5c06\u9010\u6b65\u5b9e\u73b0\u5173\u952e\u529f\u80fd&#xff1a;<\/p>\n<ul>\n<li>\u6784\u9020\u51fd\u6570&#xff1a;\u521d\u59cb\u5316\u6307\u9488\u548c\u5185\u5b58\u3002<\/li>\n<li>\u6790\u6784\u51fd\u6570&#xff1a;\u91ca\u653e\u5185\u5b58\u3002<\/li>\n<li>push_back&#xff1a;\u6dfb\u52a0\u5143\u7d20&#xff0c;\u5904\u7406\u5185\u5b58\u6269\u5bb9\u3002<\/li>\n<li>size \u548c capacity&#xff1a;\u8fd4\u56de\u5f53\u524d\u5927\u5c0f\u548c\u5bb9\u91cf\u3002<\/li>\n<li>operator[]&#xff1a;\u652f\u6301\u4e0b\u6807\u8bbf\u95ee\u3002<\/li>\n<li>\u5185\u5b58\u7ba1\u7406&#xff1a;\u5b9e\u73b0\u91cd\u65b0\u5206\u914d\u903b\u8f91\u3002<\/li>\n<\/ul>\n<p>\u6211\u4eec\u5c06\u4f7f\u7528 C&#043;&#043; \u8bed\u8a00\u7f16\u5199\u4ee3\u7801&#xff0c;\u786e\u4fdd\u4ee3\u7801\u7b80\u6d01\u6613\u8bfb\u3002\u5b9e\u73b0\u57fa\u4e8e\u4e09\u6307\u9488\u6a21\u578b&#xff0c;\u5e76\u5904\u7406\u8fb9\u754c\u60c5\u51b5\u3002<\/p>\n<h6>\u6b65\u9aa4 1: \u5b9a\u4e49 Vector \u7c7b\u548c\u6210\u5458<\/h6>\n<p>\u9996\u5148&#xff0c;\u5b9a\u4e49\u7c7b\u7ed3\u6784&#xff0c;\u5305\u62ec\u4e09\u4e2a\u79c1\u6709\u6307\u9488\u548c\u4e00\u4e9b\u8f85\u52a9\u51fd\u6570\u3002<\/p>\n<p>#include &lt;cstddef&gt;  \/\/ \u7528\u4e8e size_t<br \/>\n#include &lt;algorithm&gt; \/\/ \u7528\u4e8e std::copy<\/p>\n<p>template &lt;typename T&gt;<br \/>\nclass Vector {<br \/>\nprivate:<br \/>\n    T* start_;          \/\/ \u6307\u5411\u6570\u7ec4\u8d77\u59cb\u4f4d\u7f6e<br \/>\n    T* finish_;         \/\/ \u6307\u5411\u6709\u6548\u5143\u7d20\u7ed3\u675f\u4f4d\u7f6e<br \/>\n    T* end_of_storage_; \/\/ \u6307\u5411\u5185\u5b58\u7ed3\u675f\u4f4d\u7f6e<\/p>\n<p>public:<br \/>\n    \/\/ \u6784\u9020\u51fd\u6570<br \/>\n    Vector() : start_(nullptr), finish_(nullptr), end_of_storage_(nullptr) {}<\/p>\n<p>    \/\/ \u6790\u6784\u51fd\u6570<br \/>\n    ~Vector() {<br \/>\n        delete[] start_;  \/\/ \u91ca\u653e\u6574\u4e2a\u5185\u5b58\u5757<br \/>\n    }<\/p>\n<p>    \/\/ 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\u548c\u4e0b\u6807\u8bbf\u95ee\u64cd\u4f5c\u7b26\u3002\u8fd9\u4e9b\u51fd\u6570\u76f4\u63a5\u57fa\u4e8e\u6307\u9488\u8ba1\u7b97\u3002<\/p>\n<p>size_t size() const {<br \/>\n    return finish_ &#8211; start_;  \/\/ \u5143\u7d20\u6570\u91cf<br \/>\n}<\/p>\n<p>size_t capacity() const {<br \/>\n    return end_of_storage_ &#8211; start_;  \/\/ \u5f53\u524d\u5bb9\u91cf<br \/>\n}<\/p>\n<p>T&amp; operator[](size_t index) {<br \/>\n    return start_[index];  \/\/ \u4e0b\u6807\u8bbf\u95ee&#xff0c;\u4e0d\u68c0\u67e5\u8fb9\u754c&#xff08;\u7b80\u5316\u7248&#xff09;<br \/>\n}<\/p>\n<h6>\u6b65\u9aa4 3: \u5b9e\u73b0 push_back \u548c\u5185\u5b58\u7ba1\u7406<\/h6>\n<p>push_back \u662f\u6838\u5fc3\u51fd\u6570&#xff0c;\u9700\u8981\u5904\u7406\u5185\u5b58\u6269\u5bb9\u3002\u5f53\u7a7a\u95f4\u4e0d\u8db3\u65f6&#xff0c;\u91cd\u65b0\u5206\u914d\u5185\u5b58&#xff08;\u5bb9\u91cf\u52a0\u500d&#xff09;&#xff0c;\u5e76\u590d\u5236\u539f\u6709\u5143\u7d20\u3002<\/p>\n<p>void push_back(const T&amp; value) {<br \/>\n    if (finish_ &#061;&#061; end_of_storage_) {  \/\/ \u7a7a\u95f4\u4e0d\u8db3&#xff0c;\u9700\u8981\u6269\u5bb9<br \/>\n        size_t new_capacity &#061; (capacity() &#061;&#061; 0) ? 1 : capacity() * 2;  \/\/ \u65b0\u5bb9\u91cf&#xff08;\u521d\u59cb\u4e3a1\u6216\u52a0\u500d&#xff09;<br \/>\n        T* new_start &#061; new T[new_capacity];  \/\/ \u5206\u914d\u65b0\u5185\u5b58<\/p>\n<p>        \/\/ \u590d\u5236\u539f\u6709\u5143\u7d20\u5230\u65b0\u5185\u5b58<br \/>\n        for (size_t i &#061; 0; i &lt; size(); &#043;&#043;i) {<br \/>\n            new_start[i] &#061; start_[i];<br \/>\n        }<\/p>\n<p>        \/\/ \u91ca\u653e\u65e7\u5185\u5b58&#xff0c;\u66f4\u65b0\u6307\u9488<br \/>\n        delete[] start_;<br \/>\n        start_ &#061; new_start;<br \/>\n        finish_ &#061; start_ &#043; size();  \/\/ finish_ \u6307\u5411\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u4e0b\u4e00\u4e2a\u4f4d\u7f6e<br \/>\n        end_of_storage_ &#061; start_ &#043; new_capacity;<br \/>\n    }<\/p>\n<p>    \/\/ \u6dfb\u52a0\u65b0\u5143\u7d20<br \/>\n    *finish_ &#061; value;<br \/>\n    &#043;&#043;finish_;  \/\/ \u79fb\u52a8 finish_ \u6307\u9488<br \/>\n}<\/p>\n<h6>\u6b65\u9aa4 4: \u6dfb\u52a0\u5176\u4ed6\u8f85\u52a9\u51fd\u6570&#xff08;\u53ef\u9009&#xff09;<\/h6>\n<p>\u4e3a\u4e86\u5b8c\u6574\u6027&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0 reserve \u548c clear \u51fd\u6570\u3002<\/p>\n<p>void reserve(size_t new_capacity) {<br \/>\n    if (new_capacity &lt;&#061; capacity()) return;  \/\/ \u4e0d\u9700\u8981\u6269\u5bb9<\/p>\n<p>    T* new_start &#061; new T[new_capacity];<br \/>\n    for (size_t i &#061; 0; i &lt; size(); &#043;&#043;i) {<br \/>\n        new_start[i] &#061; start_[i];<br \/>\n    }<\/p>\n<p>    delete[] start_;<br \/>\n    start_ &#061; new_start;<br \/>\n    finish_ &#061; start_ &#043; size();<br \/>\n    end_of_storage_ &#061; start_ &#043; new_capacity;<br \/>\n}<\/p>\n<p>void clear() {<br \/>\n    finish_ &#061; start_;  \/\/ \u6e05\u7a7a\u5143\u7d20&#xff0c;\u4f46\u4e0d\u91ca\u653e\u5185\u5b58<br \/>\n}<\/p>\n<h5>3. \u5b8c\u6574 Vector \u5b9e\u73b0\u4ee3\u7801<\/h5>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u7b80\u5316\u7248 Vector \u7c7b\u5b9e\u73b0&#xff0c;\u57fa\u4e8e\u4e0a\u8ff0\u6b65\u9aa4\u3002\u4ee3\u7801\u5305\u62ec\u6ce8\u91ca\u4ee5\u4fbf\u7406\u89e3\u3002<\/p>\n<p>#include &lt;cstddef&gt;<br \/>\n#include &lt;algorithm&gt;<\/p>\n<p>template &lt;typename T&gt;<br \/>\nclass Vector {<br \/>\nprivate:<br \/>\n    T* start_;<br \/>\n    T* finish_;<br \/>\n    T* end_of_storage_;<\/p>\n<p>public:<br \/>\n    \/\/ \u9ed8\u8ba4\u6784\u9020\u51fd\u6570<br \/>\n    Vector() : start_(nullptr), finish_(nullptr), end_of_storage_(nullptr) {}<\/p>\n<p>    \/\/ \u5e26\u521d\u59cb\u5bb9\u91cf\u7684\u6784\u9020\u51fd\u6570<br \/>\n    explicit Vector(size_t capacity) {<br \/>\n        start_ &#061; new T[capacity];<br \/>\n        finish_ &#061; start_;<br \/>\n        end_of_storage_ &#061; start_ &#043; capacity;<br \/>\n    }<\/p>\n<p>    \/\/ \u6790\u6784\u51fd\u6570<br \/>\n    ~Vector() {<br \/>\n        delete[] start_;<br \/>\n    }<\/p>\n<p>    \/\/ \u8fd4\u56de\u5143\u7d20\u6570\u91cf<br \/>\n    size_t size() const {<br \/>\n        return finish_ &#8211; start_;<br \/>\n    }<\/p>\n<p>    \/\/ \u8fd4\u56de\u5f53\u524d\u5bb9\u91cf<br \/>\n    size_t capacity() const {<br \/>\n        return end_of_storage_ &#8211; start_;<br \/>\n    }<\/p>\n<p>    \/\/ \u4e0b\u6807\u8bbf\u95ee<br \/>\n    T&amp; operator[](size_t index) {<br \/>\n        return start_[index];<br \/>\n    }<\/p>\n<p>    \/\/ \u6dfb\u52a0\u5143\u7d20<br \/>\n    void push_back(const T&amp; value) {<br \/>\n        if (finish_ &#061;&#061; end_of_storage_) {<br \/>\n            size_t new_capacity &#061; (capacity() &#061;&#061; 0) ? 1 : capacity() * 2;<br \/>\n            T* new_start &#061; new T[new_capacity];<br \/>\n            for (size_t i &#061; 0; i &lt; size(); &#043;&#043;i) {<br \/>\n         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