C + + Initializer_list

First you need to turn on the compiler c++11, follow the steps below (codeblocks)

Setting-->compiler the option to tick the red box.

First look at the role of initializer_list, you can use curly braces to initialize the STL container, and can be used in a for loop.

1#include <iostream>2#include <vector>3 using namespacestd;4 5 intMain ()6 {7vector<string> v{"AB","CD"};8vector<string>::iterator begin =V.begin ();9      while(begin!=v.end ())Ten     { Onecout << *begin++ <<Endl; A     } -      for(inti:{1,2,3}) -     { thecout << i <<Endl; -     } -     return 0; -}

The printing results are as follows:

Take a look at the official role:

We can declare initializer_list in the parameters of a function, so that when we call this function, we can pass the curly brace directly to the function. As shown in the following code:

1 #ifndef s_h_included2 #defines_h_included3 4#include <vector>5#include <initializer_list>6#include <iostream>7 8 using namespacestd;9 TenTemplate <typename t> One classS A { - Private: -Vector<t>v; the  Public: -S (initializer_list<t>l): V (L) -     { -cout <<"constructed with a"<< l.size () <<"-element lists"<<Endl; +     } -     voidAppend (initializer_list<t>l) +     { A V.insert (V.end (), L.begin (), L.end ()); at     } -     voidappend (t t) -     { - V.push_back (t); -     } -     voidprint () in     { -TypeName Vector<t>::iterator begin =V.begin (); to          while(begin!=v.end ()) +         { -cout << *begin++ <<Endl; the         } *     } $ };Panax Notoginseng  - #endif //s_h_included

Look at the code of the call:

1#include <iostream>2#include"S.h"3 4 using namespacestd;5 6 intMain ()7 {8s<int> s{Ten};9S.append (1);TenS.append ({2,3,4,6,9}); Onecout <<"begin to print ()"<<Endl; A s.print (); -     return 0; -}

The final print results are as follows:

Don't forget that the header file is #include <initializer_list>

C + + Initializer_list