I am reading thinking in c++ book(Vol.2).I am in template section amd i don't understand typename keyword's meaning and usage.
Here is sample code:
Here why do we write "typename Seq<T>::iterator b" .Maybe i don't understand because Seq<T> is special library.Is it a type of library?Code:#include <iostream>
#include <list>
#include <memory>
#include <vector>
using namespace std;
template<class T, template<class U, class = allocator<U> >
class Seq>
void printSeq(Seq<T>& seq) {
for(typename Seq<T>::iterator b = seq.begin();
b != seq.end();)
cout << *b++ << endl;
}
int main() {
// Process a vector
vector<int> v;
v.push_back(1);
v.push_back(2);
printSeq(v);
// Process a list
list<int> lst;
lst.push_back(3);
lst.push_back(4);
printSeq(lst);
} ///:~
I really don not understand typename keyword.
Can someone explain me that please?
Thanks.