{"id":6363,"date":"2022-09-02T23:32:27","date_gmt":"2022-09-02T18:02:27","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-pointers-give-seg-fault-closed\/"},"modified":"2022-09-02T23:32:27","modified_gmt":"2022-09-02T18:02:27","slug":"solved-pointers-give-seg-fault-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-pointers-give-seg-fault-closed\/","title":{"rendered":"[Solved] Pointers give seg fault [closed]"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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You have not assigned anything to the pointers to the Paddle<\/code>, Ball<\/code> or Manager<\/code> variables in your main method. <\/p>\n

By default the won’t be initialised and will point somewhere in memory, which may or may not be accessible to your application. When you access them and the memory is inaccessible you get the access violation or segfault you’re observing. <\/p>\n

There are two approaches you could take. If you change your main as follows:<\/p>\n

int main()\n{\n    Paddle p1;\n    Paddle p2;\n    Ball b;\n    Manager m;\n    m.Run(&p1,&p2,&b);\n    return 0;\n}\n<\/code><\/pre>\n
Then an instance of each of the classes will exist on the stack. Since the application exits once m.Run<\/code> returns it’s safe to use this approach as the lifetime of the objects is longer than the code called by Run<\/code>.<\/p>\n
Alternatively you can allocate them on the heap. In this case you can use:<\/p>\n
int main()\n{\n    std::unique_ptr<Paddle>( new Paddle );\n    std::unique_ptr<Paddle>( new Paddle );\n    std::unique_ptr<Ball>( new Ball );\n    std::unique_ptr<Manager>( new Manager );\n    m->Run(p1.get(),p2.get(),b.get());\n    return 0;\n}\n<\/code><\/pre>\n
The unique_ptr<\/code> will hold a pointer to a Paddle<\/code> etc allocated on the heap and will automatically clean it up for you once the main<\/code> method returns.<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            2<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Pointers give seg fault [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] You have not assigned anything to the pointers to the Paddle, Ball or Manager variables in your main method. By default the won’t be initialised and will point somewhere in memory, which may or may not be accessible to your application. When you access them and the memory is inaccessible you get the access … 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],"class_list":["post-6363","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c"],"yoast_head":"\n[Solved] Pointers give seg fault [closed] - 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-pointers-give-seg-fault-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Pointers give seg fault [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You have not assigned anything to the pointers to the Paddle, Ball or Manager variables in your main method. 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