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I defined a template class Poly in poly.h
template <class T,class S> class Poly{ . . . . //and a friend function friend Poly<T,S> operator* <>(const T
&c,const Poly<T,S> &pl) ;
}; Then I want to define another class:
typedef class Poly<double,double>
sPoly;
class biPoly : public Poly<sPoly,double> {
.
. . . } I used g++2.952 ,
after compiling, a error appeared like this: In instantiation of `Polynomial<double,double>': bipoly.h:5: instantiated from here poly.h:97: invalid use of undefined type `class Poly<double,double>' poly.h:22: forward declaration of `class Poly<double,double>' poly.h:97: confused by earlier errors, bailing out then I defined template class Poly<double,double>; but a error like this appeared : invalid use of undefined type :Poly<Poly<double,double>,double> but I used g++2.905 and succeeded,what should I do? |
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