In practice, the vector series in c ++ -- vector (unique_ptr () initialization (Ownership Transfer)

In practice, the vector series in c ++ -- vector (unique_ptr () initialization (Ownership Transfer)

C ++ 11 provides us with smart pointers and brings us a lot of convenience.

What if unique_ptr is used as an element of the vector container?

The format is exactly the same:vector > vec;

But how to add elements to vec?

See the following:

# Include
  
   
# Include
   
    
# Include
    
     
Using namespace std; int main () {vector
     
      
> Vec; vec. push_back (1); // return 0 ;}
     
    
   
  

Then define a unique_ptr and then perform push_back ():

# Include
  
   
# Include
   
    
# Include
    
     
Using namespace std; int main () {vector
     
      
> Vec; unique_ptr
      
        Sp (new int (126); vec. push_back (sp); // try to reference the deleted function return 0 ;}
      
     
    
   
  

This is the ownership of the unique smart pointer. In this case, you need to use std: move:

# Include
  
   
# Include
   
    
# Include
    
     
Using namespace std; int main () {vector
     
      
> Vec; unique_ptr
      
        Sp (new int (126); // vec. push_back (1); vec. push_back (std: move (sp); // try to reference the deleted function cout <* vec [0] <endl; // output 126 // cout <* sp <endl; return 0 ;}
      
     
    
   
  

But what is the sp programming in the above Code? Use the * value to check the cause of the program crash?
The sp has been released and ownership has been transferred!