chapter5-19.cpp

STL程序员开发指南源码

//文件名：CHAPTER5-19.cpp
#pragma warning(disable: 4786)
#include <set>
#include <iostream>
int main()
{
	//default constructor
	std::multiset<int> c1 ;
	int ai[] = {0, 0, 1, 1, 2, 2, 3, 4} ;
	//construct from a range
	std::multiset<int> c2(ai, ai + 8) ;
	//copy constructor
	std::multiset<int> c3(c2) ;
	std::multiset<int>::iterator Iter ;
	std::multiset<int>::reverse_iterator RevIter ;
	//empty
	if(c1.empty()){std::cout << "multiset c1 is empty" << std::endl ;	}
	else{	std::cout << "multiset c1 is not empty" << std::endl ;	}
	//begin, end
	std::cout << "c2 (using begin, end)  = " ;
	for(Iter = c2.begin(); Iter != c2.end(); Iter++){	std::cout << *Iter << " " ;}
	std::cout << std::endl ;
	//rbegin, rend
	std::cout << "c2 (using rbegin, rend) = " ;
	for(RevIter = c2.rbegin(); RevIter != c2.rend(); RevIter++)	{std::cout << *RevIter << " " ;}
	std::cout << std::endl ;
	//insert
	c1.insert(ai, ai+4) ;
	c1.insert(1) ;
	//count
	std::cout << "Number elements in c1 that match 1 = " << c1.count(1) << std::endl ;	
	//find
	std::multiset<int>::const_iterator constIter = c1.find(3) ;
	if(constIter != c1.end()){std::cout << "c1 contains element 3, *constIter = " << *constIter << std::endl ;}
	//max_size
	std::cout << "c1.max_size() = " << c1.max_size() << std::endl ;
	//size
	std::cout << "c1.size() = " << c1.size() << std::endl ;
	//swap
	c1.insert(4) ;
	c2.swap(c1) ;
	std::cout << "The last element of c2 = " << *(c2.rbegin())<< std::endl ;
	//clear
	c1.clear() ;
	std::cout << "After calling c1.clear(), c1.size() = "<< c1.size() << std::endl ;
	//get_allocator
	std::multiset<int>::allocator_type a1 = c1.get_allocator() ;
	//key_compare
	std::multiset<int>::key_compare kc = c2.key_comp() ;
	bool result = kc(2, 3) ;
	if(result == true){std::cout << "kc is function object used by c2.  kc(2,3) = true" << std::endl ;}
	else{	std::cout << "kc is function object used by c2.  kc(2,3) = false" << std::endl ;}
	//value_comp
	std::multiset<int>::value_compare vc = c2.value_comp() ;
	result = vc(10, 4) ;
	if(result == true){std::cout << "vc is function object used by c2.  vc(10,4) = true" << std::endl ;}
	else{std::cout << "vc is function object used by c2.  vc(10,4) = false" << std::endl ;}
	//upper_bound
	std::cout << "* (c2.upper_bound(3)) = "<< *(c2.upper_bound(3)) << std::endl ;
	//lower_bound
	std::cout << "* (c2.lower_bound(3)) = "<< *(c2.lower_bound(3)) << std::endl ;
	//equal_range
	std::pair<std::multiset<int>::const_iterator, std::multiset<int>::const_iterator> pr1 = c2.equal_range(3) ;
	std::cout << "*(pr1.first) = " << *(pr1.first) << "\t"<< "*(pr1.second) = " << *(pr1.second) << std::endl ;
	//erase
	if(c3.erase(1) != 0){std::cout << "c3 does not contain 1 any more" << std::endl ;}
	else{	std::cout << "No elements in c3 match key 1" << std::endl ;}
	if((c2.erase(c2.begin())) != c2.end()){std::cout << "c2 does not contain 0 any more" << std::endl ;}
	else{	std::cout << "No elements in c2 match key 0" << std::endl ;}
	c3.erase(c3.begin(), c3.end()) ;
	std::cout << "after c3.erase(c3.begin(), c3.end()), c3.size() = "<< c3.size() << std::endl ;
	return 0 ;
}