{"id":6698,"date":"2022-09-04T17:04:18","date_gmt":"2022-09-04T11:34:18","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-deleting-allocated-memory-pointed-by-vector-element-crashes-the-program-closed\/"},"modified":"2022-09-04T17:04:18","modified_gmt":"2022-09-04T11:34:18","slug":"solved-deleting-allocated-memory-pointed-by-vector-element-crashes-the-program-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-deleting-allocated-memory-pointed-by-vector-element-crashes-the-program-closed\/","title":{"rendered":"[Solved] Deleting allocated memory pointed by vector element crashes the program [closed]"},"content":{"rendered":"

[ad_1]
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buffer<\/code> is allocated with new[]<\/code>, so it must be freed using delete[]<\/code> instead of delete<\/code>.<\/p>\n

indicator<\/code> is allocated with new<\/code>, so it must be freed using delete<\/code> and not delete[]<\/code>.<\/p>\n

And there is no need to check for null, delete<\/code> and delete[]<\/code> already handle that for you:<\/p>\n

void FreeColumns()\n{\n    for (auto &column : columns)\n    {\n        delete[] column.buffer;\n        delete column.indicator;\n    }\n}\n<\/code><\/pre>\n
That being said, you should use std::vector<\/code> and std::unique_ptr<\/code>, then you can get rid of FreeColumns()<\/code> altogether and simply call columns.clear()<\/code> when needed.<\/p>\n
struct OracleColumnStruct {\n    std::string name;\n    ub2 ociType;\n    FieldType fieldType;\n    std::vector<char> buffer;\n    std::unique_ptr<sb2> indicator;\n    OCIDefine *defineHandler;\n};\n\nvoid AllocateColumns \n{\n    columnCount = ... \/\/ whatever from database\n\n    for (unsigned int i = 0; i < columnCount; i++)\n    {\n        ...\n        OracleColumnStruct data;\n        data.name = \"whatever\";\n        data.ociType = ociType;\n        data.buffer.resize(size);\n        data.indicator.reset(new sb2);\n        \/\/ or: data.indicator = std::make_unique<sb2>();\n\n        columns.push_back(data);\n       ...\n    }\n}\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            2<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Deleting allocated memory pointed by vector element crashes the program [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] buffer is allocated with new[], so it must be freed using delete[] instead of delete. indicator is allocated with new, so it must be freed using delete and not delete[]. And there is no need to check for null, delete and delete[] already handle that for you: void FreeColumns() { for (auto &column : … 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":[324,806],"class_list":["post-6698","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-vector"],"yoast_head":"\n[Solved] Deleting allocated memory pointed by vector element crashes the program [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-deleting-allocated-memory-pointed-by-vector-element-crashes-the-program-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Deleting allocated memory pointed by vector element crashes the program [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] buffer is allocated with new[], so it must be freed using delete[] instead of delete. indicator is allocated with new, so it must be freed using delete and not delete[]. 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