Trying to place the following code into a c++ header -

i'm working put similar string of code header bool can used multiple .cpp files. i'm having issues compiling after adding program , hoping assistance.

here code:

bool isuseradmin(void) {     bool b;     sid_identifier_authority ntauthority = security_nt_authority;     psid administratorsgroup;      b = allocateandinitializesid(             &ntauthority,             2,             security_builtin_domain_rid,             domain_alias_rid_admins,             0, 0, 0, 0, 0, 0,             &administratorsgroup);      if(b)      {         if (!checktokenmembership( null, administratorsgroup, &b))          {             b = false;         }      freesid(administratorsgroup);      }  return(b); } 

thank help.

function definitions don't belong in header, because naturally leads multiply defined symbols.

you can combat using

• static - marking function declaration+definition static make local tu (translation unit, i.e. cpp file)
• static inline
• anonymous namespaces.
  enclosing unnames namespace so: namespace { /*function definition*/ } makes local tu
• (hackishly) making function template

however, don't recommend doing unless there benefit it. you'd have start worryin odr (one-definition-rule) , since had ask question, i'm going assume bit beyond experience language.