How do I delete a pointer in the queue pointer?-CodePudding

Two Pointers queue element is the same, remove the pointer element in a queue, another queue in how to deal with? The pointer is not become NULL last q2!

 class A 
{
Public: 
A (int A) 
{
Id=a; 
} 
Int id=0; 
}; 

Void main () 
{
DequeDequeA * A=new A (3); 
A * b=new A (4); 
Q1. The push_back (a); 
Q1. The push_back (b); 
Q2. The push_back (a); 
Q2. The push_back (b); 
For (auto & amp; P: q1) 
{
delete p; 
P=NULL; 
} 
For (auto & amp; P: q2) 
{
If (p==NULL) 
{
Printf (" NULL \ r \ n "); 
} 
The else 
{
Printf (" % d \ r \ n ", p - & gt; Id); 
} 
} 
}

CodePudding user response:

STL containers advice directly to store objects

CodePudding user response:

Record the index position, corresponding to delete

CodePudding user response:

refer to the second floor oyljerry response:

record index position, delete the corresponding

Now the question is not how to delete storage element,
But when I was in operating a queue, q2 operation, for example, don't know it to store Pointers is effective is not effective, if invalid, still directly using memory corruption,

CodePudding user response:

reference me_zyk reply: 3/f

Quote: refer to the second floor oyljerry response:

Record index position, corresponding to the deletion of

Now the question is not how to delete storage element,
But when I was in operating a queue, q2 operation, for example, don't know it to store Pointers is effective is not effective, if invalid, still use memory corruption, directly

Insert/delete/a for three places have to lock

CodePudding user response:

With smart Pointers