Identifier is undefined

Question

I wrote the following code in C   using VS2012 Express     void ac search      uint num patterns  uint pattern length  const char  patterns       uint num records  uint record length  const char  records      int  matches  Node  trie          Irrelevant code omitted         vector lt int gt  ac benchmark search      uint num patterns  uint pattern length      const char  patterns  uint num records  uint record length      const char  records  double  amp time          Prepare the container for the results   vector lt int gt  matches num records   num patterns     Trie T    Node  trie   T addWord records  num records  record length         error line   ac search num patterns  pattern length  patterns  num records              record length  records  matches data    trie             Irrelevant code omitted        return matches      I get the error identifier  ac search  is undefined at the function invoking line  I am a bit confused here  because the function ac search is declared as a global  not inside any container   Why can t I call it at this place  Am I missing something     Update    I tried ignore irrelevant code and then included it gradually and found that everything is fine until I include the outer loop of ac search I get the aforementioned error  here is updated code of the function ac search     void ac cpu string search uint num patterns  uint pattern length  const char  patterns                          uint num records  uint record length  const char  records  int  matches  Node  trie           Loop over all records       for  uint record number   0  record number  lt  num records    record number                       Loop over all patterns         for  uint pattern number   0  pattern number  lt  num patterns    pattern number                           Execute string search             const char  ptr record    amp records record number   record length               const char  ptr match   std  strstr ptr record   amp patterns pattern number   pattern length                    If pattern was found  then calculate offset  otherwise result is -1             if  ptr match                                matches record number   num patterns   pattern number    static cast lt int gt  std  distance ptr record  ptr match                              else                               matches record number   num patterns   pattern number    -1                                          Update 2      I think the error has something to do with the function addWord which belongs to the class Trie  When I commented out this function  I did not get the error anymore   Node  Trie  addWord const char  records  uint num records  uint record length            Loop over all records     for  uint record number   0  record number  lt  num records    record number                const char  ptr record    amp records record number   record length           string s   ptr record          Node  current   root          if   s length      0                         current- gt setWordMarker       an empty word             return                     for   int i   0  i  lt  s length    i                                   Node  child   current- gt findChild s i                if   child    NULL                                 current   child                                else                                       Node  tmp   new Node                        tmp- gt setContent s i                        current- gt appendChild tmp                       current   tmp                                    if   i    s length   - 1                       current- gt setWordMarker                      return current           void ac search          uint num patterns  uint pattern length  const char  patterns           uint num records  uint record length  const char  records          int  matches  Node  trie              Irrelevant code omitted                 vector lt int gt  ac benchmark search          uint num patterns  uint pattern length          const char  patterns  uint num records  uint record length          const char  records  double  amp time              Prepare the container for the results       vector lt int gt  matches num records   num patterns         Trie T        Node  trie   T addWord records  num records  record length             error line       ac search num patterns  pattern length  patterns  num records                  record length  records  matches data    trie                 Irrelevant code omitted            return matches

User · Answer

Are you missing a function declaration   void ac search uint num patterns  uint pattern length  const char  patterns                  uint num records  uint record length  const char  records  int  matches  Node  trie     Add it just before your implementation of ac benchmark search

User · Answer

You may also be missing using namespace std

User · Answer

From the update 2 and after narrowing down the problem scope  we can easily find that there is a brace missing at the end of the function addWord  The compiler will never explicitly identify such a syntax error  instead  it will assume that the missing function definition located in some other object file  The linker will complain about it and hence directly will be categorized under one of the broad the error phrases which is identifier is undefined  Reasonably  because with the current syntax the next function definition  in this case is ac search  will be included under the addWord scope  Hence  it is not a global function anymore  And that is why compiler will not see this function outside addWord and will throw this error message stating that there is no such a function  A very good elaboration about the compiler and the linker can be found in this article

[c++] Identifier is undefined

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