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class DoublePointerIter {
public:
DoublePointerIter(double* start, int len) : start_(start), len_(len) { }
double* begin() { return start_; }
double* end() { return start_ + len_; }
private:
double* start_;
int len_;
};
class DoublePointerIterDefaultConstructible: public DoublePointerIter {
// an alternate version that is default-constructible
public:
DoublePointerIterDefaultConstructible() :
DoublePointerIter(0, 0)
{}
DoublePointerIterDefaultConstructible(double* start, int len) :
DoublePointerIter(start, len)
{}
};
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