c++11之初始化列表

标签：c++11   c++   

    Player pa;                              // (a)
    Player pb();                            // (b)
    Player pc = Player();                   // (c)  
    Player pd(Player());                    // (d)    
    pd = Player()                           // (e)

#include <iostream>

struct Player{
    int id;
    const char* name;
};

int main() {
    Player player = {10001, "c++"};
    printf("%d, %s\n", player.id, player.name);
}

     1、系统内置类型

    int ia{1};                // (a)
    int ib = {1};             // (b)   
    int ic(1);                // (c) 
    int id = 1;               // (d)

    std::vector<int> va{1, 2, 3};          // (a)
    std::vector<int> vb = {1, 2, 3};       // (b)    
    std::vector<int> vc(1, 10);            // (c)   
    std::vector<int> vd{1, 10};            // (d)  

    std::pair<int, const char*> getPlayer() {
         return {10001, "c++"};
     }
    std::map<int, const char*> players = {{10001, "c++"}, {10002, "java”}};

    Player pa{};                    // (a)
    Player pb;                      // (b)  
    Player pc();                    // (c)
    Player pd(b);                   // (d)
    Player pe = b;                  // (e)
    Player pf = {b};                // (f)

class MyClass{
public:
    MyClass(int a):a_(a){
        std::cout << "normal initializer list\n";
    }

    MyClass(std::initializer_list<int> a):b_(a) {
        std::cout << "initializer list constructor\n";
    }

    MyClass(MyClass& my) {
        std::cout << "copy constructor\n";
        this->a_ = my.a_;
        this->b_ = my.b_;
    }

    MyClass& operator=(MyClass& my) {
        std::cout << "operator = constructor\n";
        this->a_ = my.a_;
        this->b_ = my.b_;
        return *this;
    }
private:
    int a_;
    std::initializer_list<int> b_;
};

    MyClass ma{1};               // (a)
    MyClass mb = {1, 2, 3};      // (b)
    MyClass mc(2);               // (c)
    MyClass md = b;              // (d)
    MyClass me(c);               // (e)
    MyClass mf{e};               // (f)
    auto l{2, 2, 3,3};
    MyClass mh{l};               // (e)
    ma = mb;                     // (h)

initializer list constructor

initializer list constructor

normal constructor list

copy constructor

copy constructor

copy constructor

initializer list constructor

operator = constructor

c++11之初始化列表,布布扣,bubuko.com

c++11之初始化列表

标签：c++11   c++   

原文地址：http://blog.csdn.net/hackmind/article/details/25838049