For example,

 
Templace 
Struct People {
T the info; 
People * last; 
People * next; 
People ()=default; 
~ People () the default; 
}; 

For such a structure, used to store data in another class, then the class has a remove function to remove some index data

 
Template 
The class PeopleList {
Private: 
People * allPeople; 
//... 
Public: 
Void the remove (STD: : size_t index); 
}; 
Template 
Void PeopleList : : remove (STD: : size_t index) {
People * TMP=allPeople;; 
STD: : size_t currentIndex=0; 
While (currentIndex!=(index - 1)) {
TMP=TMP - & gt; The last; 
+ + currentIndex; 
} 

TMP - & gt; T: : ~ (T);//?? How to call People's destructor 
Delete the TMP; 
} 

For composed of multiple People list, I want to delete one of the elements, to do step 2
1. Call People destructor, because People in the info may be also applied to memory
2. Delete People's memory

That how to call People's destructor

CodePudding user response:

Why have malloc and free C, C + + requires new delete?
Because new automatically calls the constructor, delete automatically calls the destructor,
Delete TMP, the destructor call ~ People automatically, need not show called

If you use the place new, need to display calls the constructor and destructor
For example,
BYTE * pb=new BYTE [sizeof (STD: : string)];
((STD: : string *) pb) - & gt; STD: : basic_string & lt; Char, STD: : char_traits & lt; Char> , STD: : allocator : : basic_string ();
((STD: : string *) pb) - & gt; STD: : basic_string & lt; Char, STD: : char_traits & lt; Char> , STD: : allocator : : ~ basic_string ();

Really want to call the destructor template (the above example has given STD: : string template examples)
TMP - & gt; People : : ~ People ();

CodePudding user response:

It is ok to directly delete
Called automatically delete TMP TMP destructor, and deleted in the destructor of TMP TMP contains memory

CodePudding user response:

What's the difficult?
Delete allPeople PeopleList



TMP - & gt; T: : ~ (T);//this is the error code, don't need to delete will automatically call
Delete the TMP;