C++11-initialization list

1:常規初始化

int arr[]={1,2};
vector<int> v;
vector<int> v(2);
vector<int> v(2,101);
vector<int> (varr,arr+2);
拷貝構造等

//map初始化方式
map<int,string> mis;
mis[1]="china";
mis[2]=""americ;
mis[3]=canada;

mis.insert(make_pair<int,string>(1,"china"));
mis.insert(make_pair<int,string>(2,"americ"));
for(auto &item:mis){
	cout<<item.first<<item.second<<endl;
}
mis.insert(map<int,string>::value_type(2,"americ"));
//

2：簡便初始化方式

vector<int> v={1,2,3,4,5};
map<int,string> mis={
{1,"china"},{2,"americ"}
};
mis.insert({3,"canada"});

#include <initializer_list>
int sum(const initializer_list<int> &list){
	int s=0;
	for(auto &i:list){
		s + = list;
	}
	return s;
}
int main(){
	int s=sum({1,2,3,4,5});
}

template<class T>
class MyArr{
public:
	MyArr()=default;
	Myarr(const initializer<T> & il){
		for(auto &i:il){
			i.push_back(i);
		}
	}
}
MyArr<int> a;
MyArr<int> b({1,2,3,4,5});