{"id":16429,"date":"2022-10-16T22:09:38","date_gmt":"2022-10-16T16:39:38","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-does-pointer-assignment-cause-variable-assignment-to-not-always-stick\/"},"modified":"2022-10-16T22:09:38","modified_gmt":"2022-10-16T16:39:38","slug":"solved-why-does-pointer-assignment-cause-variable-assignment-to-not-always-stick","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-does-pointer-assignment-cause-variable-assignment-to-not-always-stick\/","title":{"rendered":"[Solved] Why does pointer assignment cause variable assignment to not always stick?"},"content":{"rendered":"

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\n<\/p>\n

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The problem is with the pointer assignments as you build the slice you are trying to reference. The addresses keep changing.<\/p>\n

func main(){\n    var lump []int\n    \n    \/\/ A loop to build a slice of `int`'s from 0 size to 8 size\n    \/\/ and print each index address\n    for i:= 0; i < 8; i++{\n        lump = append(lump, int(i))\n        fmt.Printf(\"addr of lump[%v]: %p\\n\",i, &lump[i])\n    }\n    \n    fmt.Println()\n    \n    \/\/ A loop to look at the addresses of each index\n    for i := range lump{\n        fmt.Printf(\"addr of lump[%v]: %p\\n\",i, &lump[i])\n    }\n}\n<\/code><\/pre>\n
Check out the addresses not being created in sequential memory locations.<\/p>\n
\/\/while building the slice\n\/\/ notice the addresses making big jumps\naddr of lump[0]: 0xc00000a0c8\naddr of lump[1]: 0xc00000a0f8\naddr of lump[2]: 0xc00000e3b0\naddr of lump[3]: 0xc00000e3b8\naddr of lump[4]: 0xc00000c2e0\naddr of lump[5]: 0xc00000c2e8\naddr of lump[6]: 0xc00000c2f0\naddr of lump[7]: 0xc00000c2f8\n\n\/\/after building the slice\n\/\/ notice all address being sequential\naddr of lump[0]: 0xc00000c2c0\naddr of lump[1]: 0xc00000c2c8\naddr of lump[2]: 0xc00000c2d0\naddr of lump[3]: 0xc00000c2d8\naddr of lump[4]: 0xc00000c2e0\naddr of lump[5]: 0xc00000c2e8\naddr of lump[6]: 0xc00000c2f0\naddr of lump[7]: 0xc00000c2f8\n<\/code><\/pre>\n
You could move to C\/C++ where you could handle all the memory adjustments as the array increases in size. Or build one slice then the other.<\/p>\n<\/p><\/div>\n
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            <\/span> <\/p><\/div>\n<\/div>\n
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solved Why does pointer assignment cause variable assignment to not always stick? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] The problem is with the pointer assignments as you build the slice you are trying to reference. The addresses keep changing. func main(){ var lump []int \/\/ A loop to build a slice of `int`’s from 0 size to 8 size \/\/ and print each index address for i:= 0; i < 8; i++{ … 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":[596,712,2417],"class_list":["post-16429","post","type-post","status-publish","format-standard","hentry","category-solved","tag-go","tag-pointers","tag-variable-assignment"],"yoast_head":"\n[Solved] Why does pointer assignment cause variable assignment to not always stick? - 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-why-does-pointer-assignment-cause-variable-assignment-to-not-always-stick\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Why does pointer assignment cause variable assignment to not always stick? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The problem is with the pointer assignments as you build the slice you are trying to reference. 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