{"id":32624,"date":"2025-04-24T20:18:22","date_gmt":"2025-04-24T12:18:22","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/32624.html"},"modified":"2025-04-24T20:18:22","modified_gmt":"2025-04-24T12:18:22","slug":"c%e5%86%85%e5%ad%98%e6%b1%a0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/32624.html","title":{"rendered":"c++\u5185\u5b58\u6c60"},"content":{"rendered":"<p>\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u5185\u5b58\u6c60&#xff0c;\u7528\u4e8e\u9ad8\u6548\u5206\u914d\u548c\u91ca\u653e\u56fa\u5b9a\u5927\u5c0f\u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u4ee3\u7801\u793a\u4f8b<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstdlib&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stack&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MemoryPool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">MemoryPool<\/span><span class=\"token punctuation\">(<\/span>size_t objectSize<span class=\"token punctuation\">,<\/span> size_t poolSize<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">:<\/span> <span class=\"token function\">objSize<\/span><span class=\"token punctuation\">(<\/span>objectSize<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">totalSize<\/span><span class=\"token punctuation\">(<\/span>poolSize<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">pool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span>objectSize <span class=\"token operator\">*<\/span> poolSize<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pool <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> std<span class=\"token operator\">::<\/span><span class=\"token function\">bad_alloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u521d\u59cb\u5316 free list<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>size_t i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> poolSize<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            freeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>pool <span class=\"token operator\">&#043;<\/span> i <span class=\"token operator\">*<\/span> objectSize<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token operator\">~<\/span><span class=\"token function\">MemoryPool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>pool<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">allocate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>freeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> std<span class=\"token operator\">::<\/span><span class=\"token function\">bad_alloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> ptr <span class=\"token operator\">&#061;<\/span> freeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">top<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        freeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> ptr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">deallocate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> ptr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        freeList<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>ptr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    size_t objSize<span class=\"token punctuation\">;<\/span><br \/>\n    size_t totalSize<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> pool<span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token operator\">::<\/span>stack<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span><span class=\"token operator\">&gt;<\/span> freeList<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyClass<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">MyClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> val<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token function\">value<\/span><span class=\"token punctuation\">(<\/span>val<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;MyClass constructor: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> value <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token operator\">~<\/span><span class=\"token function\">MyClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;MyClass destructor: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> value <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> value<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u80fd\u5bb9\u7eb3 3 \u4e2a MyClass \u5bf9\u8c61\u7684\u5185\u5b58\u6c60<\/span><br \/>\n        MemoryPool <span class=\"token function\">pool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>MyClass<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5206\u914d\u5bf9\u8c61\u5185\u5b58<\/span><br \/>\n        <span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> mem1 <span class=\"token operator\">&#061;<\/span> pool<span class=\"token punctuation\">.<\/span><span class=\"token function\">allocate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> mem2 <span class=\"token operator\">&#061;<\/span> pool<span class=\"token punctuation\">.<\/span><span class=\"token function\">allocate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4f7f\u7528\u201c\u5b9a\u4f4d new\u201d\u6784\u9020\u5bf9\u8c61<\/span><br \/>\n        MyClass<span class=\"token operator\">*<\/span> obj1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span><span class=\"token punctuation\">(<\/span>mem1<span class=\"token punctuation\">)<\/span> <span class=\"token function\">MyClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        MyClass<span class=\"token operator\">*<\/span> obj2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span><span class=\"token punctuation\">(<\/span>mem2<span class=\"token punctuation\">)<\/span> <span class=\"token function\">MyClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4f7f\u7528\u5bf9\u8c61<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;obj1 value: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> obj1<span class=\"token operator\">-&gt;<\/span>value <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;obj2 value: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> obj2<span class=\"token operator\">-&gt;<\/span>value <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u663e\u5f0f\u8c03\u7528\u6790\u6784\u51fd\u6570<\/span><br \/>\n        obj1<span class=\"token operator\">-&gt;<\/span><span class=\"token operator\">~<\/span><span class=\"token function\">MyClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        obj2<span class=\"token operator\">-&gt;<\/span><span class=\"token operator\">~<\/span><span class=\"token function\">MyClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u91ca\u653e\u5185\u5b58<\/span><br \/>\n        pool<span class=\"token punctuation\">.<\/span><span class=\"token function\">deallocate<\/span><span class=\"token punctuation\">(<\/span>mem1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        pool<span class=\"token punctuation\">.<\/span><span class=\"token function\">deallocate<\/span><span class=\"token punctuation\">(<\/span>mem2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> std<span class=\"token operator\">::<\/span>bad_alloc<span class=\"token operator\">&amp;<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token operator\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;Memory pool allocation error: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">what<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token operator\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p><span class=\"token key atrule\">MyClass constructor<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">100<\/span><br \/>\n<span class=\"token key atrule\">MyClass constructor<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><br \/>\n<span class=\"token key atrule\">obj1 value<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">100<\/span><br \/>\n<span class=\"token key atrule\">obj2 value<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><br \/>\n<span class=\"token key atrule\">MyClass destructor<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">100<\/span><br \/>\n<span class=\"token key atrule\">MyClass destructor<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><\/p>\n<p>\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>MemoryPool \u7ba1\u7406\u56fa\u5b9a\u5927\u5c0f\u7684\u5185\u5b58\u5757&#xff0c;\u907f\u514d\u9891\u7e41\u8c03\u7528 malloc \u548c free\u3002<\/li>\n<li>\u4f7f\u7528\u201c\u5b9a\u4f4d new\u201d\u5728\u9884\u5206\u914d\u7684\u5185\u5b58\u4e0a\u6784\u9020\u5bf9\u8c61\u3002<\/li>\n<li>\u9700\u8981\u624b\u52a8\u8c03\u7528\u6790\u6784\u51fd\u6570\u548c\u5c06\u5185\u5b58\u8fd4\u56de\u7ed9\u5185\u5b58\u6c60\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f&#xff1a;\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u5927\u91cf\u5c0f\u5bf9\u8c61\u7684\u9ad8\u6548\u7ba1\u7406&#xff0c;\u4f46\u9700\u8981\u786e\u4fdd\u6b63\u786e\u4f7f\u7528\u6784\u9020\u548c\u6790\u6784\u51fd\u6570\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb200\u6b21\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u5927\u91cf\u5c0f\u5bf9\u8c61\u7684\u9ad8\u6548\u7ba1\u7406\uff0c\u4f46\u9700\u8981\u786e\u4fdd\u6b63\u786e\u4f7f\u7528\u6784\u9020\u548c\u6790\u6784\u51fd\u6570\u3002\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u5185\u5b58\u6c60\uff0c\u7528\u4e8e\u9ad8\u6548\u5206\u914d\u548c\u91ca\u653e\u56fa\u5b9a\u5927\u5c0f\u7684\u5bf9\u8c61\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55],"topic":[],"class_list":["post-32624","post","type-post","status-publish","format-standard","hentry","category-server","tag-c"],"yoast_head":"<!-- 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