{"id":15533,"date":"2022-10-12T00:50:06","date_gmt":"2022-10-11T19:20:06","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-stdvector-push_back-results-in-access-violation\/"},"modified":"2022-10-12T00:50:06","modified_gmt":"2022-10-11T19:20:06","slug":"solved-stdvector-push_back-results-in-access-violation","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-stdvector-push_back-results-in-access-violation\/","title":{"rendered":"[Solved] std::vector push_back results in access Violation"},"content":{"rendered":"

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Dict* test = (Dict*)malloc(sizeof(Dict));<\/code> does not do what you think it does.<\/p>\n

malloc<\/code> allocates a block of memory, but does not initialize it. So later on, when you call test->nodes.push_back<\/code>, you’re calling into uninitialized memory. Undefined behavior. In your case, it crashes.<\/p>\n

The solution here is allocate test<\/code> with new<\/code>, which will initialize both test<\/code> and test->nodes<\/code>.<\/p>\n

Dict* test = new Dict;\n<\/code><\/pre>\n
The even better solution is to ask why test<\/code> is dynamically allocated to begin with.<\/p>\n<\/p><\/div>\n
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            0<\/span> <\/p><\/div>\n<\/div>\n
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solved std::vector push_back results in access Violation <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Dict* test = (Dict*)malloc(sizeof(Dict)); does not do what you think it does. malloc allocates a block of memory, but does not initialize it. So later on, when you call test->nodes.push_back, you’re calling into uninitialized memory. Undefined behavior. In your case, it crashes. The solution here is allocate test with new, which will initialize both … 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":[741,324,2887,2585,1969],"class_list":["post-15533","post","type-post","status-publish","format-standard","hentry","category-solved","tag-access-violation","tag-c","tag-push-back","tag-stdvector","tag-visual-studio-2008"],"yoast_head":"\n[Solved] std::vector push_back results in access Violation - 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-stdvector-push_back-results-in-access-violation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] std::vector push_back results in access Violation - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Dict* test = (Dict*)malloc(sizeof(Dict)); does not do what you think it does. malloc allocates a block of memory, but does not initialize it. So later on, when you call test->nodes.push_back, you’re calling into uninitialized memory. Undefined behavior. In your case, it crashes. The solution here is allocate test with new, which will initialize both ... 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So later on, when you call test->nodes.push_back, you’re calling into uninitialized memory. Undefined behavior. In your case, it crashes. The solution here is allocate test with new, which will initialize both ... 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