i was have 2 vector code. one of them was with "class" and the other was "struct" i wanted to make one vector for these. i deleted the class then optimize the class using vectors.. but i got this error: error C2011: 'CVector3' : 'struct' type redefinition i am using visual c++ 6. has anyone any idea to solve this? sorry for bad english

without seeing some code I can only recommend this.

and based on you what you said, my guess is that you have a 'class CVector3' AND 'struct CVector3'. struct and class are the same in C++, except that struct has default public members and class has default private members.