{"id":27938,"date":"2024-03-16T09:29:11","date_gmt":"2024-03-16T09:29:11","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/definition-and-usage-of-c-pointer-functions\/"},"modified":"2024-03-22T12:14:44","modified_gmt":"2024-03-22T12:14:44","slug":"definition-and-usage-of-c-pointer-functions","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/definition-and-usage-of-c-pointer-functions\/","title":{"rendered":"Definition and Usage of C++ Pointer Functions"},"content":{"rendered":"<p>A pointer function in C++ is a function that returns a pointer. It can return a pointer to any data type, including primitive data types, custom data types, arrays, etc.<\/p>\n<p>The form of defining a pointer function is as follows:<\/p>\n<pre class=\"post-pre\"><code>\u8fd4\u56de\u7c7b\u578b* \u51fd\u6570\u540d(\u53c2\u6570\u5217\u8868) {\r\n    <span class=\"hljs-comment\">\/\/ \u51fd\u6570\u4f53<\/span>\r\n}\r\n<\/code><\/pre>\n<p>The return type represents the type of pointer that the function returns, * is the identifier for pointer type, the function name is the name of the function, and the parameter list is the parameters the function can accept.<\/p>\n<p>The usage of pointer functions is as follows:<\/p>\n<ol>\n<li>Return a pointer pointing to a basic data type.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span>* <span class=\"hljs-title\">getNumber<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n    <span class=\"hljs-type\">int<\/span>* ptr = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-type\">int<\/span>;\r\n    *ptr = <span class=\"hljs-number\">10<\/span>;\r\n    <span class=\"hljs-keyword\">return<\/span> ptr;\r\n}\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n    <span class=\"hljs-type\">int<\/span>* numPtr = <span class=\"hljs-built_in\">getNumber<\/span>();\r\n    cout &lt;&lt; *numPtr &lt;&lt; endl;  <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1a10<\/span>\r\n    <span class=\"hljs-keyword\">delete<\/span> numPtr;\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Return a pointer to a custom data type.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title class_\">Person<\/span> {\r\n    string name;\r\n    <span class=\"hljs-type\">int<\/span> age;\r\n};\r\n\r\n<span class=\"hljs-function\">Person* <span class=\"hljs-title\">createPerson<\/span><span class=\"hljs-params\">(string name, <span class=\"hljs-type\">int<\/span> age)<\/span> <\/span>{\r\n    Person* ptr = <span class=\"hljs-keyword\">new<\/span> Person;\r\n    ptr-&gt;name = name;\r\n    ptr-&gt;age = age;\r\n    <span class=\"hljs-keyword\">return<\/span> ptr;\r\n}\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n    Person* personPtr = <span class=\"hljs-built_in\">createPerson<\/span>(<span class=\"hljs-string\">\"Alice\"<\/span>, <span class=\"hljs-number\">20<\/span>);\r\n    cout &lt;&lt; personPtr-&gt;name &lt;&lt; endl;  <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1aAlice<\/span>\r\n    cout &lt;&lt; personPtr-&gt;age &lt;&lt; endl;   <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1a20<\/span>\r\n    <span class=\"hljs-keyword\">delete<\/span> personPtr;\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Return a pointer pointing to an array.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span>* <span class=\"hljs-title\">createArray<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> size)<\/span> <\/span>{\r\n    <span class=\"hljs-type\">int<\/span>* arr = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-type\">int<\/span>[size];\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; size; i++) {\r\n        arr[i] = i + <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n    <span class=\"hljs-keyword\">return<\/span> arr;\r\n}\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n    <span class=\"hljs-type\">int<\/span>* arrPtr = <span class=\"hljs-built_in\">createArray<\/span>(<span class=\"hljs-number\">5<\/span>);\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">5<\/span>; i++) {\r\n        cout &lt;&lt; arrPtr[i] &lt;&lt; <span class=\"hljs-string\">\" \"<\/span>;  <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\uff1a1 2 3 4 5<\/span>\r\n    }\r\n    <span class=\"hljs-keyword\">delete<\/span>[] arrPtr;\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>It is important to note that after using a pointer function to return a pointer, you need to manually release the memory to prevent memory leaks. You can use delete to release memory pointed to by a single pointer, or use delete[] to release memory pointed to by an array.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A pointer function in C++ is a function that returns a pointer. It can return a pointer to any data type, including primitive data types, custom data types, arrays, etc. The form of defining a pointer function is as follows: \u8fd4\u56de\u7c7b\u578b* \u51fd\u6570\u540d(\u53c2\u6570\u5217\u8868) { \/\/ \u51fd\u6570\u4f53 } The return type represents the type of pointer that [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-27938","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Definition and Usage of C++ Pointer Functions - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/definition-and-usage-of-c-pointer-functions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Definition and Usage of C++ Pointer Functions\" \/>\n<meta property=\"og:description\" content=\"A pointer function in C++ is a function that returns a pointer. 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