c++ - Cannot move virtual function outside header -

i have c++ class header defines many functions inline. want move these functions outside header , seperate .cpp file speeden compile. although can move normal functions seperate file , keep function deceleration in header, when try move virtual functions .cpp following error:

error 2 - error c2723: 'virtual' storage-class specifier illegal on function definition

how do that? function follows:

 virtual void soundmixersub::setfilters(const mixerfilter& f)  {  ....  } 

as says, can't have virtual on function definition outside class, per §7.1.2:

the virtual specifier shall used in initial declaration of non-static class member function

keep virtual on declaration , remove definition. in header file:

class soundmixersub : ... {   // ...   virtual void setfilters(const mixerfilter&);   // ... }; 

then in implementation file:

void soundmixersub::setfilters(const mixerfilter& f) {    // ... }