{"id":5069,"date":"2022-08-26T09:25:53","date_gmt":"2022-08-26T03:55:53","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-creating-a-second-instance-of-an-object-changes-whole-class-behavior-c\/"},"modified":"2022-08-26T09:25:53","modified_gmt":"2022-08-26T03:55:53","slug":"solved-creating-a-second-instance-of-an-object-changes-whole-class-behavior-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-creating-a-second-instance-of-an-object-changes-whole-class-behavior-c\/","title":{"rendered":"[Solved] Creating a second instance of an object changes whole class behavior (C++)"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-55378787\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"55378787\" data-parentid=\"55378196\" data-score=\"2\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<blockquote>\n<pre><code>WayPointStack wps = *(new WayPointStack());\n<\/code><\/pre>\n<\/blockquote>\n<p>must be<\/p>\n<pre><code>WayPointStack wps;\n<\/code><\/pre>\n<p>because it is enough and that removes the memory leak<\/p>\n<hr>\n<p>In      <\/p>\n<blockquote>\n<pre><code> WPCommand WayPointStack::GetNextWP()\n {\n     ...\n     return *(new WPCommand(_END, 10000));\n }\n<\/code><\/pre>\n<\/blockquote>\n<p>you create an other memory leak, may be do not return the element but its address allowing you to return nullptr on error ?<\/p>\n<pre><code> \/*const ?*\/ WPCommand * WayPointStack::GetNextWP()\n {\n     Serial.println(\"Pointer = \");\n     Serial.println(pointer);\n     Serial.println(\"Length = \");\n     Serial.println(_length);\n     if (pointer &lt; _length){\n       return &amp;_wp[pointer++];\n     }\n     return nullptr;\n }\n<\/code><\/pre>\n<p>else use a static var :<\/p>\n<pre><code>  WPCommand WayPointStack::GetNextWP()\n  {\n      ...\n      static WPCommand error(_END, 10000);\n      return error;\n  }\n<\/code><\/pre>\n<hr>\n<p>In<\/p>\n<blockquote>\n<pre><code>void WayPointStack::AddWP(int target, int time)\n{\n    if (_length == arrSize)\n        return;\n    _wp[_length] = *(new WPCommand(target, time));\n    _length++;\n}\n<\/code><\/pre>\n<\/blockquote>\n<p>you create an other memory leak, you just need to initialize the entry :<\/p>\n<pre><code> void WayPointStack::AddWP(int target, int time)\n {\n     if (_length == arrSize)\n         return;\n     _wp[_length]._target = target, time));\n     _wp[_length]._time = time;\n     _length++;\n }\n<\/code><\/pre>\n<p>you do not signal the error when you cannot add a new element, what about to return a <em>bool<\/em> valuing false on error and true when you can add :<\/p>\n<pre><code> bool WayPointStack::AddWP(int target, int time)\n {\n     if (_length == arrSize)\n         return false;\n     _wp[_length]._target = target;\n     _wp[_length]._time = time;\n     _length++;\n     return true;\n }\n<\/code><\/pre>\n<hr>\n<p>Finally Why do you not use a <code>std::vector<\/code> for <code>_wp<\/code><\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Creating a second instance of an object changes whole class behavior (C++) <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] WayPointStack wps = *(new WayPointStack()); must be WayPointStack wps; because it is enough and that removes the memory leak In WPCommand WayPointStack::GetNextWP() { &#8230; return *(new WPCommand(_END, 10000)); } you create an other memory leak, may be do not return the element but its address allowing you to return nullptr on error ? \/*const &#8230; <a title=\"[Solved] Creating a second instance of an object changes whole class behavior (C++)\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-creating-a-second-instance-of-an-object-changes-whole-class-behavior-c\/\" aria-label=\"More on [Solved] Creating a second instance of an object changes whole class behavior (C++)\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,613,430],"class_list":["post-5069","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-initialization","tag-object"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Creating a second instance of an object changes whole class behavior (C++) - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-creating-a-second-instance-of-an-object-changes-whole-class-behavior-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Creating a second instance of an object changes whole class behavior (C++) - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] WayPointStack wps = *(new WayPointStack()); must be WayPointStack wps; because it is enough and that removes the memory leak In WPCommand WayPointStack::GetNextWP() { ... return *(new WPCommand(_END, 10000)); } you create an other memory leak, may be do not return the element but its address allowing you to return nullptr on error ? 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