linker - c++ unresolved external symbol? -


this question has answer here:

while working on project in vs, decided split source separate files. after trying compile however, got error:

lnk2019 unresolved external symbol "public: __thiscall cs_rawuser::cs_rawuser(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,int)" (??0cs_rawuser@@qae@v?$basic_string@du?$char_traits@d@std@@v?$allocator@d@2@@std@@0h@z) referenced in function "void __cdecl mkuser(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?mkuser@@yaxv?$basic_string@du?$char_traits@d@std@@v?$allocator@d@2@@std@@00@z)

i searched on google , found multiple similar questions. however, of them had same answer regarding missing implementation. in source (unless horribly mistaken) function mentioned in error defined.

cs_obj.cpp:

class cs_rawuser { private:     string m_username;     string m_password;     int m_level;  string compiledatabaseentry() {     return "csec_instance_user:" + m_username + "," + m_password + "," + to_string(m_level); }  public:     cs_rawuser(string username, string password, int level)     {         m_username = username;         m_password = password;         m_level = level;     }     string username() { return m_username; }     string password() { return m_password; }     int level() { return m_level; }     string compile() { return compiledatabaseentry(); } };

cs_obj.h:

class cs_rawuser { private:     std::string m_username;     std::string m_password;     int m_level;     std::string compiledatabaseentry(); public:     cs_rawuser(std::string username, std::string password, int level);     std::string username();     std::string password();     int level();     std::string compile(); };

your implementation file shouldn't redefining class. here's possible (correct) code looks like:

cs_obj.h:

class cs_rawuser { public:     cs_rawuser(std::string username, std::string password, int level); };

cs_obj.cpp

#include "cs_obj.h"  cs_rawuser::cs_rawuser(std::string username, std::string password, int level) {     ... // initialization here... }

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