{"id":19523,"date":"2022-11-06T23:55:21","date_gmt":"2022-11-06T18:25:21","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-define-sign-ambiguous-pointer-parameter-for-a-function\/"},"modified":"2022-11-06T23:55:21","modified_gmt":"2022-11-06T18:25:21","slug":"solved-define-sign-ambiguous-pointer-parameter-for-a-function","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-define-sign-ambiguous-pointer-parameter-for-a-function\/","title":{"rendered":"[Solved] Define sign ambiguous pointer parameter for a function"},"content":{"rendered":"

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With C, you have limited options. You can do the typecasting that you don’t like when you call the function:<\/p>\n

void MyFunction(unsigned char* Var);\n\nint main(void) {\n    unsigned char Var1 = 5U;\n    signed char Var2 = 5;\n\n    MyFunction(&Var1);\n    MyFunction((unsigned char *)&Var2);\n}\n<\/code><\/pre>\n
you can use void *<\/code> and typecast in the function itself and just not pass the wrong type of pointer to it:<\/p>\n
void MyFunction(void* Var);\n\nint main(void) {\n    unsigned char Var1 = 5U;\n    signed char Var2 = 5;\n\n    MyFunction(&Var1);\n    MyFunction(&Var2);\n}\n<\/code><\/pre>\n
Or if you really<\/em> want something beyond that, you can use a _Generic macro to automagically typecast it for you.  It may or may not be the “best” approach, but I think it will accomplish your goal.<\/p>\n
#define MY_FUNCTION_HELPER(X) MyFunction( _Generic((X), \\\n   char *: (unsigned char *)X, \\\n   signed char *: (unsigned char *)X, \\\n   unsigned char *: X \\\n   ) \\\n)\n\nvoid MyFunction(unsigned char *Var);\n\nint main(void) {\n    unsigned char Var1 = 5U;\n    signed char Var2 = 5;\n\n    MY_FUNCTION_HELPER(&Var1);\n    MY_FUNCTION_HELPER(&Var2);\n}\n<\/code><\/pre>\n
The last one works by using the C11-introduced _Generic<\/code> which allows a form of polymorphism to use different expressions based on the type of a controlling expression.  In this case, if X<\/code> is char *<\/code> or signed char *<\/code>, it will perform a typecast to unsigned char *<\/code>.  If X<\/code> is already unsigned char *<\/code>, it will remain as such.  If X<\/code> is anything else, it will fail to compile as no other types are accounted for in the generic association list.<\/p>\n<\/p><\/div>\n
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            1<\/span> <\/p><\/div>\n<\/div>\n
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solved Define sign ambiguous pointer parameter for a function <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] With C, you have limited options. You can do the typecasting that you don’t like when you call the function: void MyFunction(unsigned char* Var); int main(void) { unsigned char Var1 = 5U; signed char Var2 = 5; MyFunction(&Var1); MyFunction((unsigned char *)&Var2); } you can use void * and typecast in the function itself and … 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":[324,564,610,1040],"class_list":["post-19523","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-programming-languages","tag-visual-studio","tag-visual-studio-2012"],"yoast_head":"\n[Solved] Define sign ambiguous pointer parameter for a function - 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-define-sign-ambiguous-pointer-parameter-for-a-function\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Define sign ambiguous pointer parameter for a function - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] With C, you have limited options. You can do the typecasting that you don’t like when you call the function: void MyFunction(unsigned char* Var); int main(void) { unsigned char Var1 = 5U; signed char Var2 = 5; MyFunction(&Var1); MyFunction((unsigned char *)&Var2); } you can use void * and typecast in the function itself and ... 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