c++ - I am trying to make my own version of vector's swap in C++03 and am completely stuck/baffled by error -


i trying make swap method in version of vector class uses c++03 format without boost. code have is

template <class t> void kvector<t>::swap(kvector<t> &in) {     kvector<t>* temp = &in; //copying pointer of in temp , therefore bypassing assignment operator     //now switch in , , , temp using pointer arithmetic again bypass assignment operator     //!note: pointer based arithmetic used in swap method exponentially faster using     //!assignment operator or copy constructor      &in = this;     = temp;     //!no need set data pointer of temp 0 since temp pointer , not     //!deleted automatically. since both in , still exist @ end of method     //!than no memory can leak method }

which attempts pass around vectors pointers. getting error &in = this; , this = temp;. error expression 'not assignable'. don't understand error means , why error. can please explain this? baffled.


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