{"id":25608,"date":"2022-12-11T08:13:46","date_gmt":"2022-12-11T02:43:46","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-decoding-declarationa-combination-of-array-and-function-pointers-in-c-closed\/"},"modified":"2022-12-11T08:13:46","modified_gmt":"2022-12-11T02:43:46","slug":"solved-decoding-declarationa-combination-of-array-and-function-pointers-in-c-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-decoding-declarationa-combination-of-array-and-function-pointers-in-c-closed\/","title":{"rendered":"[Solved] Decoding declaration(a combination of array and function pointers) in C [closed]"},"content":{"rendered":"

[ad_1]
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That code is not a declaration, but it can be interpreted as an expression.<\/p>\n

(*I_dont_know())[(int) ((*ptr))]\n<\/code><\/pre>\n
    \n
  1. Call the function I_dont_know<\/code> with no arguments. This function returns a pointer to something.<\/li>\n
  2. Dereference the returned pointer to get some object.<\/li>\n
  3. Meanwhile, dereference the value of ptr<\/code> and cast it to an int<\/code> value.<\/li>\n
  4. Then pass that int<\/code> value as the argument for the []<\/code> (indexing) operator on that object returned in step 2. In C this could be another pointer or an array (arrays decay to pointers too). In C++ this could also be an object with the []<\/code> operator overloaded.<\/li>\n
  5. As this expression is not on the left-hand-side of an assignment then the value returned from the []<\/code> operator sub-expression (i.e. the element at the *ptr<\/code>-index in the array) will be returned.<\/li>\n<\/ol>\n
    Assuming this is C, then the argument to the indexing operator should be cast as size_t<\/code> and not int<\/code>. If it’s C++ then it should only be cast to int<\/code> if the []<\/code> operator overload specifically accepts an int<\/code> parameter operand.<\/p>\n<\/p><\/div>\n
    <\/div>\n<\/div>\n
                2<\/span> <\/p><\/div>\n<\/div>\n
    [ad_2]<\/p>\n
    solved Decoding declaration(a combination of array and function pointers) in C [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
    [ad_1] That code is not a declaration, but it can be interpreted as an expression. (*I_dont_know())[(int) ((*ptr))] Call the function I_dont_know with no arguments. This function returns a pointer to something. Dereference the returned pointer to get some object. Meanwhile, dereference the value of ptr and cast it to an int value. Then pass that … 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":[361,324,3275],"class_list":["post-25608","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-c","tag-function-pointers"],"yoast_head":"\n[Solved] Decoding declaration(a combination of array and function pointers) in C [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-decoding-declarationa-combination-of-array-and-function-pointers-in-c-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Decoding declaration(a combination of array and function pointers) in C [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] That code is not a declaration, but it can be interpreted as an expression. (*I_dont_know())[(int) ((*ptr))] Call the function I_dont_know with no arguments. This function returns a pointer to something. Dereference the returned pointer to get some object. Meanwhile, dereference the value of ptr and cast it to an int value. Then pass that ... 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(*I_dont_know())[(int) ((*ptr))] Call the function I_dont_know with no arguments. This function returns a pointer to something. Dereference the returned pointer to get some object. Meanwhile, dereference the value of ptr and cast it to an int value. Then pass that ... 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