Eroare de compilare: user.cpp: In member function ‘void hash_base::hash(char*, char*)’: user.cpp:29: warning: statement has no effect user.cpp: In member function ‘void hash_base::operator+(int)’: user.cpp:38: warning: unused variable ‘sem’ user.cpp: In function ‘int main()’: user.cpp:116: warning: deprecated conversion from string constant to ‘char*’ user.cpp:116: warning: deprecated conversion from string constant to ‘char*’ /tmp/ccvteI9W.o:(.rodata._ZTI11linear_hash[typeinfo for linear_hash]+0x8): undefined reference to `typeinfo for hash_base' /tmp/ccvteI9W.o:(.rodata._ZTI11double_hash[typeinfo for double_hash]+0x8): undefined reference to `typeinfo for hash_base' collect2: ld returned 1 exit status