c++11新特性的简单介绍

#include 
   
   
    
    
#include 
    
    
     
     
#include 
     
     
      
      
#include 
      
      
       
       
#include 
       
       
         #include 
        
          #include 
         
           #include 
          
            using std::cout; using std::cin; using std::endl; using std::vector; using std::string; using std::for_each; using std::shared_ptr; using std::thread; std::mutex g_mutex; void my_thread1(int num, const string& str){ g_mutex.lock(); for(int i=0; i<10; i++){ cout << "num:" << num << ", name:" << str << endl; } g_mutex.unlock(); } void my_thread2(){ int g_num = 20; for (int i=0; i<10; i++){ cout << "num:" << g_num << endl; } } int main(int argc,char * argv [ ]){ //类型推导 //auto自动根据初始化子的类型产生参数，首先应有被明确初始化的参数 vector 
           
             myvec(3, 4); for (auto itr = myvec.cbegin();itr != myvec.cend();itr++){ cout << *itr << endl; } int my_array[4] = {1,2,3,4}; for (auto &x : my_array){ x *= 2; cout << x << endl; } //lambda函数，用[&]声明 vector 
            
              someList(2, 5); int total = 0; int value = 10; for_each(someList.begin(), someList.end(), [&, value](int x){ total += (x * value); }); cout << total << endl; //空指针nullptr char *pc = nullptr; char str[] = "hello world"; pc = str; cout << pc << endl; //通用智能指针 shared_ptr 
             
               p_first(new double); shared_ptr 
              
                p_copy = p_first; *p_copy = 21.1; cout << *p_first << endl; //c++11线程类std::thread，独占式互斥量std::mutex，允许超时的互斥量 int num = 1234; string str_td = "qwer"; thread t(my_thread1,num,str_td); thread t1(my_thread2); t.join(); t1.join(); return 0; }