{"id":4994,"date":"2022-08-25T17:52:09","date_gmt":"2022-08-25T12:22:09","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-can-i-compare-pointers-in-go\/"},"modified":"2022-08-25T17:52:09","modified_gmt":"2022-08-25T12:22:09","slug":"solved-how-can-i-compare-pointers-in-go","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-can-i-compare-pointers-in-go\/","title":{"rendered":"[Solved] How can I compare pointers in Go?"},"content":{"rendered":"

[ad_1]
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Is it guaranteed that the order of the pointers remains the same? (For
\n example, I can imagine some GC trickery which also reorders the data.)<\/p>\n<\/blockquote>\n

In answer to this part of your question, it doesn’t look like it. See pkg unsafe linked below. <\/p>\n

If you want the memory address of a pointer, try the unsafe package:<\/p>\n

https:\/\/golang.org\/pkg\/unsafe\/#Pointer<\/a><\/p>\n

package main\n\nimport (\n    \"fmt\"\n    \"unsafe\"\n)\n\nfunc main() {\n    var a,b int\n    var pa,pb *int\n    pa = &a\n    pb = &b\n\n    \/\/var c int\n    \/\/pa = &c\n\n    if uintptr(unsafe.Pointer(pa)) < uintptr(unsafe.Pointer(pb)) {\n      fmt.Printf(\"a:%p > b:%p\",pa,pb)   \n    } else {\n      fmt.Printf(\"b:%p > a:%p\",pb,pa)\n    }\n\n}\n<\/code><\/pre>\n
This will let you get an arbitrary Pointer type and then the current<\/em> memory address of that pointer (as printf would). Note the caveats there though, you cannot rely on this address:<\/p>\n
\n
Converting a Pointer to a uintptr produces the memory address of the
\n  value pointed at, as an integer. The usual use for such a uintptr is
\n  to print it. Conversion of a uintptr back to Pointer is not valid in
\n  general. A uintptr is an integer, not a reference. Converting a
\n  Pointer to a uintptr creates an integer value with no pointer
\n  semantics. Even if a uintptr holds the address of some object, the
\n  garbage collector will not update that uintptr’s value if the object
\n  moves, nor will that uintptr keep the object from being reclaimed.<\/p>\n<\/blockquote>\n
This bypasses the Go type system and memory security so it’s unsafe and you probably don’t want to do it<\/strong>, unless you’re just experimenting. I can’t think of a reason to do it in tests, but if you want to be sure to read that entire document and be very sure you know that what you are doing will work as you expect.  <\/p>\n<\/p><\/div>\n
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            1<\/span> <\/p><\/div>\n<\/div>\n
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solved How can I compare pointers in Go? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Is it guaranteed that the order of the pointers remains the same? (For example, I can imagine some GC trickery which also reorders the data.) In answer to this part of your question, it doesn’t look like it. See pkg unsafe linked below. If you want the memory address of a pointer, try the … 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":[947,596,712],"class_list":["post-4994","post","type-post","status-publish","format-standard","hentry","category-solved","tag-comparison","tag-go","tag-pointers"],"yoast_head":"\n[Solved] How can I compare pointers in Go? - 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-how-can-i-compare-pointers-in-go\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How can I compare pointers in Go? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Is it guaranteed that the order of the pointers remains the same? 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