C++中奇怪的操作符重写

Question

https://github.com/open-rmf/rmf_traffic/blob/main/rmf_traffic/include/rmf_traffic/Trajectory.hpp
C++中奇怪的操作符重写，哪位知道什么问题？
错误：Trajectory.cpp(801,43): error C2833: “operator const_iterator”不是可识别的运算符或类型

template<typename W>
class Trajectory::base_iterator
{
public:
operator const_iterator() const;
}
实现：
template<typename SegT>
Trajectory::base_iterator<SegT>::operator const_iterator() const
{
return _pimpl->make_iterator<const SegT>(_pimpl->raw_iterator);
}

Answer 1

解决方法

template<typename SegT>
Trajectory::base_iterator<SegT>::operator Trajectory::const_iterator() const {
return _pimpl->make_iterator<const SegT>(_pimpl->raw_iterator);
}