C++ 自定义迭代器

程序员可以根据需要定义自己的迭代器。MyIterator（这个代码还没看懂）

//print.h

#include<iostream>
#include<string>

template <typename T>
inline void PRINT_ELEMENTS(const T& coll, const std::string& optstr="")
{
	std::cout<<optstr;
	std::cout<<std::endl;
}

//assoiter.h

#include<iterator>

template <typename Container>
class asso_insert_iterator : public std::iterator<std::output_iterator_tag, typename Container::value_type> 
{
	protected:
		Container& container;
	public:
		explicit asso_insert_iterator(Container& c):container(c){}

		asso_insert_iterator<Container>& operator=(const typename Container::value_type& value)
		{
			container.insert(value);
			return *this;
		}
		asso_insert_iterator<Container>& operator*()
		{
			return *this;
		}

		asso_insert_iterator<Container>& operator++(int){
			return *this;
		}
};

template <typename Container>
inline asso_insert_iterator<Container> asso_inserter(Container& c)
{
	return asso_insert_iterator<Container>(c);
}

//test.cpp

#pragma warning(disable:4786)

#include<iostream>
#include<set>
#include<vector>
#include<algorithm>
#include "print.h"
#include "assoiter.h"

int main()
{
	std::set<int> coll;
	asso_insert_iterator<std::set<int> > iter(coll);

	*iter = 1;
	iter++;
	*iter = 2;
	iter++;
	*iter = 3;

	std::copy(coll.begin(), coll.end(), std::ostream_iterator<int>(std::cout, " "));
	std::cout<<std::endl;
	
	asso_inserter(coll) = 44;
	asso_inserter(coll) = 55;
	std::copy(coll.begin(), coll.end(), std::ostream_iterator<int>(std::cout, " "));
	std::cout<<std::endl;

	std::vector<int> vals;
	vals.push_back(33);
	vals.push_back(67);
	vals.push_back(-4);
	vals.push_back(13);
	vals.push_back(5);
	vals.push_back(2);

	std::copy(vals.begin(), vals.end(), std::ostream_iterator<int>(std::cout, " "));
	std::cout<<std::endl;

	return 0;
}