Re: derive from std::set, const_iterator does not work
On Jun 8, 8:27 am, Markus Dehmann <markus.dehm...@gmail.com> wrote:
I want to derive from std::set, like shown below. But when I try to
declare an iterator over the contained elements I get an error, see
the twp uncommented lines:
#include <set>
template<class T>
class MySet : public std::set<T>{
public:
MySet() : std::set<T>() {}
void foo(){
// const_iterator it; // error: `const_iterator' undeclared (first=
use this
function)
// std::set<T>::const_iterator it; // error: expected `;' before
"it"
}
};
I thought const_iterator should be a member of this class (since I am
deriving from std::set). What am I doing wrong?
Not getting into why you want to derive from a standard container,
here's how you can make it work:
#include <set>
template<class T>
class MySet : public std::set<T>{
public:
MySet() : std::set<T>() {}
void foo(){
//either create typedefs to use iterator/const_iterator directly
typedef typename std::set<T>::const_iterator const_iterator;
typedef typename std::set<T>::iterator iterator;
const_iterator it;
//or use fully qualified names but will need typename
typename std::set<T>::const_iterator it2;
}
};
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plates/
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