{"id":8804,"date":"2021-06-20T09:21:33","date_gmt":"2021-06-20T03:51:33","guid":{"rendered":"https:\/\/python-programs.com\/?p=8804"},"modified":"2021-11-22T18:53:28","modified_gmt":"2021-11-22T13:23:28","slug":"whats-placement-new-operator-and-why-do-we-need-it","status":"publish","type":"post","link":"https:\/\/python-programs.com\/whats-placement-new-operator-and-why-do-we-need-it\/","title":{"rendered":"What\u2019s placement new operator and why do we need it ?"},"content":{"rendered":"<h2>Placement new operator and it&#8217;s need<\/h2>\n<p>This article is all about placement new operator.<\/p>\n<ul>\n<li><a href=\"#Placement_new_Operator\">Placement new Operator<\/a><\/li>\n<li><a href=\"#Need_of_placement_new_operator\">Need of placement new operator<\/a><\/li>\n<\/ul>\n<h3><a id=\"Placement_new_Operator\"><\/a>Placement new operator :<\/h3>\n<p>placement new operator we use to pass a memory address to <code>new<\/code> as a parameter. This memory is used by the placement new operator to create the object and also to call the constructor on it and then returning the same passed address.<\/p>\n<h3><a id=\"Need_of_placement_new_operator\"><\/a>Need of placement new operator :<\/h3>\n<p>As we know when we create any object using new operator, then the memory is allocated on the heap.<\/p>\n<pre><span class=\"enlighter-k5\">int<\/span><span class=\"enlighter-text\"> * ptr = <\/span><span class=\"enlighter-k3\">new<\/span> <span class=\"enlighter-k5\">int<\/span><span class=\"enlighter-text\">;<\/span><\/pre>\n<p>But, while working sometimes we need to create an object dynamically for which some specific memory location will be allocated.<\/p>\n<p>For example, we do not want new memory to be allocated on heap rather it needs to be allocated on a given memory address. Actually this scenario comes when we work on any embedded product or with shared memory. So, for this requirement we use placement new operator.<\/p>\n<p><strong>Below is an example code to achieve this :<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"cpp\">\/\/ Program\r\n\r\n#include &lt;iostream&gt;\r\n#include &lt;cstdlib&gt;\r\n#include &lt;new&gt;\r\n\r\nint main()\r\n{\r\n\/\/ Here memory will not be allocated on heap.\r\nint * space = new int[1004];\r\n\/\/ It will use passed spacer to allocate the memory\r\nint * ptr = new(space) int;\r\n*ptr = 7;\r\nstd::cout&lt;&lt;(*ptr)&lt;&lt;std::endl;\r\ndelete [] buffer;\r\nreturn 0;\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Placement new operator and it&#8217;s need This article is all about placement new operator. Placement new Operator Need of placement new operator Placement new operator : placement new operator we use to pass a memory address to new as a parameter. This memory is used by the placement new operator to create the object and &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/whats-placement-new-operator-and-why-do-we-need-it\/\"> <span class=\"screen-reader-text\">What\u2019s placement new operator and why do we need it ?<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":8805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What\u2019s placement new operator and why do we need it ? - Python Programs<\/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:\/\/python-programs.com\/whats-placement-new-operator-and-why-do-we-need-it\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What\u2019s placement new operator and why do we need it ? - Python Programs\" \/>\n<meta property=\"og:description\" content=\"Placement new operator and it&#8217;s need This article is all about placement new operator. 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