C++ multimap equal_range 例子

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typedef pair<multimap<int, int>::iterator, multimap<int, int>::iterator> multimap_pair_t;
typedef multimap<int, int>::iterator	multimap_iterator_t; 
void print_map(multimap_pair_t& in_pair)
{
	cout<<"in_pair.second = "<<in_pair.second->second<<endl;
	cout<<"in_pair.first = "<<in_pair.first->second<<endl;
	
	for(auto it = in_pair.first; it != in_pair.second; it++)
	{
		cout<<"it->second = "<<it->second<<endl;
	}
}

int main(int argc, char** argv) {
	
	multimap<int, int> test_multimap = 
	{
		{ 1, 2},
		{ 1, 3},
		{ 1, 4},
		{ 2, 2},
		{ 2, 3},
		{ 2, 3},
		{ 3, 3},
		{ 7, 4},
	};
	cout<<"-------------0000-----------------"<<endl;
	auto multimap_pair = test_multimap.equal_range(0);
	print_map(multimap_pair);
	cout<<"-------------1111-----------------"<<endl;
	multimap_pair = test_multimap.equal_range(1);
	print_map(multimap_pair);
	cout<<"-------------5555-----------------"<<endl;
	multimap_pair = test_multimap.equal_range(5);
	print_map(multimap_pair);
	cout<<"-------------3333-----------------"<<endl;
	multimap_pair = test_multimap.equal_range(3);
	print_map(multimap_pair);
	cout<<"-------------9999-----------------"<<endl;
	multimap_pair = test_multimap.equal_range(9);
	print_map(multimap_pair);
	cout<<"hello world "<<endl;
	return 0;
}

打印输出：