pancakehousemenuiterator.hpp

来自「深入浅出设计模式（书配套c++源代码)。包含20个设计模式的c++实现。」· HPP 代码 · 共 43 行

#ifndef	_HFDP_CPP_ITERATOR_DINER_MERGER_I_PANCAKE_HOUSE_ITERATOR_HPP_
#define _HFDP_CPP_ITERATOR_DINER_MERGER_I_PANCAKE_HOUSE_ITERATOR_HPP_

namespace HeadFirstDesignPatterns {
namespace Iterator {
namespace DinerMergerI {

class PancakeHouseMenuIterator : public Iterator<MenuItem > {

	private: mutable std::vector< MenuItem* > _items;
	private: mutable MenuItem* _position;
 
	private: PancakeHouseMenuIterator( const PancakeHouseMenuIterator& ); // Disable copy constructor
    private: void operator=( const PancakeHouseMenuIterator& ); // Disable assignment operator

	public: explicit PancakeHouseMenuIterator( std::vector< MenuItem* > items ) :
		_items( items ) {
		_position = *items.begin();
	}
	public: MenuItem* next() const {
		return _position;
	}
	public: bool hasNext() const {
		for( std::vector< MenuItem* >::iterator iterator = _items.begin(); iterator != _items.end(); iterator++ ) {
			if( *iterator == _position ) {
				if( ++iterator != _items.end() ) {
					_position = *iterator;
					return true;
				}
				else
					return false;
			}
		}
		return false;
	}
};

} // namespace DinerMergerI
} // namespace Iterator
} // namespace HeadFirstDesignPatterns

#endif