Re: why are all templated copy-constructors necessary?
Alf P. Steinbach wrote:
* Victor Bazarov:
Claudius wrote:
Hello,
in my class TopTen I need to define three constructors while only
the last one, the most general in terms of templates, should be
sufficient in my opinion:
template <typename Tnum, short Trank, bool Tcont>
TopTen<Tnum,Trank,Tcont>::TopTen( const TopTen<Tnum,Trank,Tcont> &
tten );
As I understand it, the above is the actual copy constructor.
Uh... A templated constructor is never a copy constructor.
Correct. But are you sure what you're looking at *is* a templated
constructor?
You're confusing a templated constructor and a constructor in a class
template. Consider
template<class T> struct A {
A() {}
A(A const& a); // non-templated copy constructor.
};
template<class S> struct B {
B() {}
template<class T> B(B<T> const& b); // templated constructor
};
// now the definitions
template<class T> A<T>::A(A<T> const&) {}
template<class S> template<class T> B<S>::B(B<T> const&) {}
int main() { A<int> ai, aii(ai); B<int> bi; B<double> bd(bi); }
Now, which one looks more like the definition you tried correcting
me about?
As you
implicitly state below:
[snip]
V
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